SERVICE INSTRUCTION R410A. WALL MOUNTEDtype SPLIT TYPE ROOM AIR CONDITIONER INVERTER. Models Indoor unit Outdoor unit AOU 9RLFW AOU12RLFW AOU15RLS

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1 SERVICE INSTRUCTION SPLIT TYPE ROOM AIR CONDITIONER WALL MOUNTEDtype INVERTER Models Indoor unit Outdoor unit ASU 9RLF ASURLF ASU5RLS AOU 9RLFW AOURLFW AOU5RLS R40A

2 CONTENTS. DESCRIPTION OF EACH CONTROL OPERATION. COOLING OPERATION HEATING OPERATION DRY OPERATION AUTO CHANGEOVER OPERATION INDOOR FAN CONTROL OUTDOOR FAN CONTROL LOUVER CONTROL COMPRESSOR CONTROL TIMER OPERATION CONTROL ELECTRONIC EXPANSION VALVE CONTROL TEST OPERATION CONTROL PREVENT TO RESTART FOR MINUTES ( MINUTES ST ) FOUR-WAY VALVE EXTENSION SELECT AUTO RESTART MANUAL AUTO OPERATION ( Indoor unit body operation ) FORCED COOLING OPERATION COMPRESSOR PREHEATING MINIMUM HEAT OPERATION ECONOMY OPERATION DEFROST OPERATION CONTROL OFF DEFROST OPERATION CONTROL VARIOUS PROTECTIONS TROUBLE SHOOTING - ERROR DISPLAY WIRED REMOTE CONTROLLER DISPLAY (OPTION) OUTDOOR UNIT DISPLAY INDOOR UNIT DISPLAY TROUBLE SHOOTING WITH ERROR CODE TROUBLE SHOOTING WITH NO ERROR CODE SERVICE PARTS INFORMATION APPENDING DATA - FUNCTION SETTING INDOOR UNIT Procedures to change the Function Setting for wireless RC Thermistor Resistance Values INDOOR UNIT OUTDOOR UNIT

3 R40A WALL MOUNTED type INVERTER. DESCRIPTION OF EACH CONTROL OPERATION

4 . COOLING OPERATION - COOLING CAPACITY CONTROL A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. * If the room temperature is 4 F( C) higher than a set temperature, the compressor operation frequency will attain to maximum performance. * If the room temperature is 5 F(.5 C) lower than a set temperature, the compressor will be stopped. * When the room temperature is between +4 F(+ C) to -5 F(-.5 C) of the setting temperature, the compressor frequency is controlled within the range shown in Table. However, the maximum frequency is limited in the range shown in Figure based on the fan speed mode and the outdoor temperature. ( Table : Compressor Frequency Range ) minimum frequency maximum frequency ASU9RLF rps 79rps ASURLF 8rps 96rps ASU5RLS 5rps 80rps ( Fig. : Limit of Maximum Frequency based on Outdoor Temperature ) Outside air temperature 9. F (4 C) 86 F (0 C) 66. F (9 C) 50 F (0 C) F (0 C) A zone B zone C zone D zone E zone F zone Outside air temperature 96.8 F (6 C) 89.6 F ( C) 69.8 F ( C) 5.6 F ( C) 5.6 F ( C) 9RLF RLF 5RLS Hi Me Lo Quiet A zone 79rps 6rps 5rps 7rps B zone 79rps 6rps 5rps 7rps C zone 79rps 6rps 5rps 7rps D zone 5rps 4rps 7rps 8rps E zone 64rps 55rps 49rps 6rps F zone 64rps 55rps 49rps 6rps A zone 96rps 6rps 5rps rps B zone 96rps 6rps 5rps rps C zone 96rps 6rps 5rps rps D zone 57rps 4rps 6rps 7rps E zone 57rps 4rps 6rps 7rps F zone 57rps 4rps 6rps 7rps A zone 80rps 45rps 7rps 9rps B zone 80rps 45rps 7rps 9rps C zone 80rps 45rps 7rps 9rps D zone 47rps 7rps rps rps E zone 47rps 7rps rps rps F zone 47rps 7rps rps rps 0-0

5 . HEATING OPERATION - HEATING CAPACITY CONTROL A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. * If the room temperature is lower by 6 F( C) than a set temperature, the compressor operation frequency will attain to maximum performance. * If the room temperature is higher 5 F(.5 C) than a set temperatire, the compressor will be stopped. * When the room temperature is between +5 F(+.5 C) to -6 F(- C) of the setting temperature, the compressor frequency is controlled within the range shown in Table. ( Table : Compressor Frequency Range ) minimum frequency maximum frequency ASU9RLF rps 99rps ASURLF 8rps 0rps ASU5RLS 5rps 9rps. DRY OPERATION - INDOOR UNIT CONTROL The compressor rotation frequency shall change according to the temperature, set temperature, and room temperature variation which the room temperature sensor of the indoor unit body has detected as shown in the Table. However, after the compressor is driven, the indoor unit shall run at operation frequency of 64rps (9RLF), 6rps (RLF), 5rps (5RLS), for a minute. ( Table : Compressor frequency ) Operating frequency Operating frequency Operating frequency 9RLF X zone J zone Y zone 7rps 8rps 0rps RLF X zone J zone Y zone rps 5rps 0rps 5RLS X zone J zone Y zone 9rps 8rps 0rps ( Fig. : Compressor Control based on Room Temperature ) Room temperature Room temperature Ts+ F (Ts+0.5 C) Ts- F (Ts-.5 C) X zone J zone Y zone Ts+ F (Ts+.5 C) Ts- F (Ts-0.5 C) 0-0

6 4. AUTO CHANGEOVER OPERATION When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum mode from among the HEATING, COOLING, DRY and MONITORING modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set between 64 F(8 C) and 88 F(0 C) in F( C) steps. Operation flow chart START Room temp. >Ts+4 F( C)? NO YES TS : Setting temperature NO Room temp. <Ts- 4 F( C)? YES HEATING OPERATION COOLING OPERATION YES Thermostat remains in OFF state for 6 minutes or longer? Thermostat remains in OFF state for 6 minutes or longer? YES NO NO YES System stops or operation command other than auto changeover operation? System stops or operation command other than auto changeover operation? YES NO NO 0-0

7 5. INDOOR FAN CONTROL. Fan speed ( Table4 : Indoor Fan Speed ) Operation mode Air flow mode Heating Hi Me+ Me Lo Quiet Cool air prevention S-Lo Cooling/ Fan Hi Me Lo Quiet Dry Speed (rpm) ASU9RLF ASURLF ASU5RLS X zone: 680 J zone: X zone: 750 J zone: 70. FAN OPERATION The airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH, while the indoor fan only runs. When Fan mode is set at (Auto), it operates on (MED) Fan Speed.. COOLING OPERATION Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature, as shown in Figure. On the other hand, if switched in [HIGH] [QUIET], the indoor motor will run at a constant airflow of [COOL] operation modes QUIET, LOW, MED, HIGH,as shown in Table4. ( Fig. : Airflow change - over ( Cooling : AUTO ) ) TR-Ts > 4 F ( C) 4 F > TR-Ts > = F ( C) ( C) F > TR-Ts ( C) HIGH mode MED mode LOW mode When the room temperature drops TR-Ts = > 5 F (.5 C) 5 F > TR-Ts > = F (.5 C) (.5 C) F > TR-Ts (.5 C) When the room temperature rises TR : Room temperature Ts : Setting temperature 4. DRY OPERATION Refer to the Table4. During the dry mode operation, the fan speed setting can not be changed. 0-04

8 5. HEATING OPERATION Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature, as shown in Figure4. On the other hand, if switched in [HIGH] [QUIET], the indoor motor will run at a constant airflow of [HEAT] operation modes QUIET, LOW, MED, HIGH, as shown in Table4. ( Fig.4 : Airflow change - over ( Heating : AUTO ) ) TR-Ts > = - F (- C) - F > TR-Ts = > -4 F (- C) (- C) -4 F > TR-Ts (- C) When the room temperature rises LOW mode MED mode MED+ mode When the room temperature drops TR-Ts = > - F (-.5 C) - F > TR-Ts > = -5 F (-.5 C) (-.5 C) -5 F > TR-Ts (-.5 C) TR : Room temperature Ts : Setting temperature 6. COOL AIR PREVENTION CONTROL (Heating mode) The maximum value of the indoor fan speed is set as shown in Figure5, based on the detected temperature by the indoor heat exchanger sensor on heating mode. (Fig.5 : Cool Air Prevention Control) Indoor heat exchanger temperature 07.6 F (4 C) 0. F (9 C) 98.6 F (7 C) 86 F (0 C) Hi Me+ Lo Cool air prevention S-Lo Indoor heat exchanger temperature 98.6 F (7 C) 9. F (4 C) 89.6 F ( C) 75. F (4 C) 7. MOISTURE RETURN PREVENTION CONTROL (Cooling mode& Dry mode) Switch the airflow [AUTO] at cooling mode, and the indoor fan motor will run as shown in Figure6. ( Fig.6 : Indoor Fan Control ) Compressor ON OFF Indoor fan Setting air flow Indoor fan (as shown in Table 5) S-Lo OFF ( Table5 : Indoor fan speed ) (SEC) X zone Dry J zone Y zone Cooling ASU9/ RLF 680rpm 660rpm ASU5RLS 750rpm 70rpm 0 480rpm 0 480rpm 480rpm 480rpm 0-05

9 6. OUTDOOR FAN CONTROL. Outdoor Fan Motor Following table shows the type of the outdoor fan motor. The control method is different between AC motor and DC motor. ( Table6 : Type of Motor ) ASU9/ RLF,5RLS AC Motor DC Motor. Fan Speed ( Table7 : Outdoor fan speed ) (rpm) Zone Cooling Heating Dry Y 860/ 780/ 760/ 470 ASU9RLF Z F 860/ 470/ / 760/ 70/ 680/ / 470 G 50 Y 850/ 750/ 670/ 500 ASURLF Z F 850/ 500/ / 850/ 750/ 680/ 550/ / 470 G 0 Y 050/ 00/ 870/ 70/ 50 ASU5RLS Z F 870/ 50/ 00 00/ 50 00/ 850/ 780/ 590/ G 50/ 00 Refer to Fig.7 ( Fig.7 : Outside air temperature zone selection ) Outside air temperature 69.8 F ( C) 5.6 F ( C) 5.6 F ( C) Y zone Z zone F zone G zone Outside air temperature 66. F (9 C) 50 F (0 C) F ( 0 C) * The outdoor fan speed mentioned above depends on the compressor frequency. (When the compressor frequency increases, the outdoor fan speed also changes to the higher speed. When the compressor frequency decreases, the outdoor fan speed also changes to the lower speed.) * After the defrost control is operated on the heating mode, the fan speed keeps at the higher speed as table8 without relating to the compressor frequency. ( Table8 : Outdoor fan speed after the defrost ) ASU9RLF ASURLF ASU5RLS 900rpm 950rpm 00rpm 0-06

10 7. LOUVER CONTROL. VERTICAL LOUVER CONTROL (Function Range) Each time the button is pressed, the air direction range will change as follow: Fig.8 : Air Direction Range Types of Air flow Direction Setting:,,,,, : During Heating/Cooling/Dry modes The Remote Controller's display does not change. Use the air direction adjustments within the ranges shown above. The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected. Cooling / Dry mode Horizontal flow Heating mode Downward flow During AUTO mode operation, for the first a few minutes after beginning operation, air-flow will be horizontal ; the air direction cannot be adjusted during this period. The air flow direction setting will temporarily become when the temperature of the air -flow is low at the start of the Heating mode SWING OPERATION When the swing signal is received from the remote controller, the vertical louver starts to swing. (Table9 : Swinging Range) Cooling / Dry mode Fan mode ( ) Heating mode Fan mode ( ) Range The SWING operation may stop temporarily when the air conditioner s fan is not operating, or when operating at very low speeds. 0-07

11 8. COMPRESSOR CONTROL. OPEARTION FREQUENCY RANGE The operation frequency of the compressor is different based on the operation mode as shown in the table0. (Table0 : Compressor Operation Frequency Range) Cooling Heating Dry Min Max Min Max Min Max ASU9RLF ASURLF rps 79rps rps 99rps 8rps 7rps 8rps 96rps 8rps 0rps 5rps rps ASU5RLS 5rps 80rps 5rps 9rps 8rps 9rps. OPEARTION FREQUENCY CONTROL AT START UP The compressor frequency soon after the start-up is controlled as shown in the Figure9. (Fig.9 : Compressor Control at Start-up) Frequency Frequency Frequency Frequency Frequency Frequency Time Time Time Time Time Time (Frequency) Frequency Frequency Frequency Frequency Frequency Frequency ASU9RLF 70rps 8rps 9rps 96rps 96rps 96rps ASURLF 56rps 74rps 87rps 97rps 08rps 9rps ASU5RLS 40rps 57rps 7rps 80rps 0rps 0rps (Time) Time Time Time Time Time Time ASU9RLF ASURLF ASU5RLS 80sec 40sec 00sec 80sec 440sec 440sec 80sec 40sec 00sec 80sec 440sec 500sec 80sec 0sec 40sec 00sec 50sec 40sec 0-08

12 9. TIMER OPEARTION CONTROL The table shows the available timer setting based on the product model. (Table : Timer Setting) ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER ASU9/ RLF,5RLS. OPEARTION FREQUENCY RANGE OFF timer : When the clock reaches the set time, the air conditioner will be turned off. Operation mode Stop mode Set time of timer ON timer : When the clock reaches the set time, the air conditioner will be turned on. Stop mode Operation mode Set time of timer. PROGRAM TIMER The program timer allows the OFF timer and ON timer to be used in combination one time. Operation mode Operation mode Operation mode Stop mode Stop mode Stop mode Set time Set time Set time Set time Operation will start from the timer setting (either OFF timer or ON timer) whichever is closest to the clock's current timer setting. The order of operations is indicated by the arrow in the remote control unit's display. SLEEP timer operation cannot be combined with ON timer operation. 0-09

13 . SLEEP TIMER If the sleep is set, the room temperature is monitored and the operation is stopped automatically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time ON. In the cooling operation mode When the sleep timer is set, the setting temperature is increased F( C). It increases the setting temperature another F( C) after hour. After that, the setting temperature is not changed and the operation is stopped at the time of timer setting. Set temperature rises ( Ts : Set temperature ) +4 F ( C) + F ( C) Ts Stop of operation Set 60min In the heating operation mode When the sleep timer is set, the setting temperature is decreased F( C). It decreases the setting temperature another F( C) every 0 minutes. Upon lowering 8 F(4 C) the setting temperature is not changed and the operation stops at the time of timer setting. Set temperature lowers ( Ts : Set temperature ) Ts - F (- C) -4 F (- C) -6 F (- C) -8 F (-4 C) Stop of operation Set 0min 0min 0min 0-0

14 0. ELECTRONIC EXPANSION VALVE CONTROL The most proper opening of the electronic expansion valve is calculated and controlled under the present operating condition based on the Table. The compressor frequency, the temperatures detected by the discharge temperature sensor, the indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature sensor. Table : The pulse range of the electronic expansion valve control ASU9/ RLF ASU5RLS Operation mode Cooling / Dry mode Heating mode Cooling / Dry mode Heating mode Pulse range between 60 to 480 pulses. between 60 to 480 pulses. between 60 to 480 pulses. between 45 to 480 pulses. The expansion valve is set at 480 pulses after 0 seconds of stopping compressor. At the time of supplying the power to the outdoor unit, the initialization of the electronic expansion valve is operated (58 pulses are input to the closing direction).. TEST OPERATION CONTROL Under the condition where the air conditioner runs, press the test run button of the remote control, and the test operation control mode will appear. During test running, the operation lamp and timer lamp of the air conditioner body twinkle simultaneously. Set the test operation mode, and the compressor will continue to run regardless of whether the room temperature sensor detects. The test operation mode is released if 60 minutes have passed after setting up the test operation.. PREVENT TO RESTART FOR MINUTES ( MINUTES ST ) The compressor won't enter operation status for minutes and 0 seconds after the compressor is stopped, even if any operation is given.. FOUR-WAY VALVE EXTENSION SELECT At the time when the air conditioner is switched from the cooling mode to heating mode, the compressor is stopped, and the four-way valve is switched in minutes and 0 seconds later after the compressor stopped. 4. AUTO RESTART When the power was interrupted by a power failure, etc. during operation, the operation contents at that time are memorized and when power is recovered, operation is automatically started with the memorized operation contents. When the power is interrupted and recovered during timer operation, since the timer operation time is shifted by the time the power was interrupted, an alarm is given by blinking (7 sec ON/ sec OFF) the indoor unit body timer lamp. [Operation contents memorized when the power is interrupted] Operation mode Set temperature Set air flow Timer mode and timer time Set air flow Direction Swing ECONOMY operation MINIMUM HEAT operation 0-

15 5. MANUAL AUTO OPERATION (Indoor unit body operation) If MANUAL AUTO Button is set, the operation is controlled as shown in Table. If the remote control is lost or battery power dissipated, this function will work without the remote control. (Table) OPERATION MODE FAN CONT. MODE TIMER MODE SETTING TEMP. SETTING LOUVER SWING ECONOMY Manual auto operation Auto changeover Auto Continuous (No timer setting available) 75. F (4 C) Standard OFF OFF Forced cooling operation Cooling Hi - Room Temp is not controlled Horizontal OFF - 6. FORCED COOLING OPERATION Forced cooling operation is started when pressing MANUAL AUTO button for 0 seconds or more. During the forced cooling operation, it operates regardless of room temperature sensor. Operation LED and timer LED blink during the forced cooling operation. They blink for second ON and second OFF on both operation LED and timer LED (same as test operation). Forced cooling operation is released after 60 minutes of starting operation. The FORCED COOLING OPERATION will start as shown in Table. 7. COMPRESSOR PREHEATING When the outdoor temperature is lower than 68 F(0 C) and the heating operation has been stopped for 0 minutes, power is applied to the compressor and the compressor is heated. (By heating the compressor, warm air is quickly discharged when operation is started.) When operation was started and when the outdoor temperature rises to 77 F(5 C) or greater, preheating is ended. 8. MINIMUM HEAT OPERATION The MINIMUM HEAT operation functions by pressing MIN.HEAT button on the remote controller. The MINIMUM HEAT operation is almost the same operation as below settings. ( Table4 ) Mode Setting temperature Fan mode Heating 50 F (0 C) AUTO 9. ECONOMY OPERATION The ECONOMY operation functions by pressing ECONOMY button on the remote controller. The ECONOMY operation is almost the same operation as below settings. ( Table5 ) Mode Cooling/ Dry Heating Target temperature Setting temp.+ F Setting temp.- F (+ C) (- C) 0-

16 0. DEFROST OPERATION CONTROL. CONDITION OF STARTING THE DEFROST OPERATION The defrost operation starts as shown in the following Table 6. (Table 6 : Condition of starting Defrost Operation) Normal defrost Less than 5 minutes Does not operate Compressor integrating operation time More than 5 minutes Outdoor heat exchanger temp. < =.4 F (-7 C) (at outside air temp. > = 4 F (-0 C)) Outdoor heat exchanger temp. < = Outside air temp.-.6 F (7 C) or Outdoor heat exchanger temp. < = - 4 F (-0 C) (at outside air temp. < 4 F (-0 C)) Integrating defrost Compressor integrating operation time More than 40 minutes (For continuous operation) Less than 0 minutes ( For intermittent operation ) Outdoor heat exchanger temp. below 6.6 F (- C) OFF count of the compressor 40 times If the compressor continuous operation time is less than 0 minutes, the OFF number of the compressor is counted. If any defrost operated, the compressor OFF count is cleared.. CONDITION OF THE DEFROST OPERATION COMPLETION Defrost operation is released when the conditions become as shown in Table 7. (Table 7 : Defrost Release Condition) Release Condition Outdoor heat exchanger temperature sensor value is higher than F (+6 C) or Compressor operation time has passed 5 minutes. 0-

17 . Defrost Flow Chart The defrosting shall proceed by the integrating operation time, outdoor temperature and outdoor heat exchanger temperature as follows. Heating operation start : Compressor ON (Not defrosted for 0 minutes) Normal defrost Integrating defrost Outside air temp. = > 4 F (-0 C) Outside air temp. < 4 F (-0 C) Intermittent operation Continuous operation Outdoor HEX temp. Below.4 F (-7 C) Outdoor HEX temp. - Outside air temp. Below -.6 F(7 C) or Outdoor HEX temp. Below - 4 F(-0 C) Compressor OFF count : 40 times Compressor integrating operation: Over 40 minutes Outdoor HEX temp. Below 6.6 F(- C) Defrost start Defrost Indicator: [Operation lamp] 7 sec ON / sec OFF Outdoor fan : OFF Compressor speed:0rps EEV : 480pulse 4-way valve : OFF Compressor speed : 90rps (09/ ) 70rps (5) Outdoor HEX temp.: Over 60.8 F(6 C) or Compressor ON time: Maximum 5 minutes Defrost end 0-4

18 . OFF DEFROST OPEARTION CONTROL When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat exchanger, the defrost operation will proceed automatically. In this time, if indoor unit defrost lamp lighting, the outdoor unit will allow the heat exchanger to defrost, and then stop.. OFF DEFROST OPERATION CONDITION In heating operation, the outdoor heat exchanger temperature is less than 4.8 F (-4 C), and compressor operation integrating time lasts for more than 0 minutes.. OFF DEFROST END CONDITION Release Condition Outdoor heat exchanger temperature sensor value is higher than 60.8 F (6 C) or Compressor operation time has passed 5 minutes. OFF Defrost Flow Chart Heating operation stop Outdoor heat exchanger temperature: Below 4.8 F(-4 C) and Compressor integrating operation: Over 0 minutes Defrost start Defrost Indicater: [Defrost lamp] Lighting Outdoor heat exchanger temperature: Over 60.8 F (6 C) or Compressor ON time: Over 5 minutes Defrost end 0-5

19 . VARIOUS PROTECTIONS. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas temperature. When the discharge temperature becomes higher than Temperature,the compressor frequency is decreased 0rps, and it continues to decrease the frequency for 0rps every 0 seconds until the temperature becomes lower than Temperature. When the discharge temperature becomes lower than Temperature the compressor frequency is released. When the discharge temperature becomes higher than Temperature and the indoor unit LED starts blinking. 9. F (04 C).8 F (0 C), the control of the control of 0 F (0 C),the compressor is stopped (Table8 : Discharge Temperature Over Rise Prevension Control / Release Temperature) Temperature Temperature Temperature ASU9/ RLF,5RLS. CURRENT RELEASE CONTROL The compressor frequency is controlled so that the outdoor unit input current does not exceeds the current limit velue that was set up with the outdoor temperature. The compressor frequency returns to the designated frequency of the indoor unit at the time when the frequency becomes lower than the release value. (Table9 : Current Release Operation Value / Release Value) [ Heating ] ASU9RLF OT (Control / Release) 5.5A/ 5.0A 6.6 F(7 C) 6.0A/ 5.5A 5.6 F( C) 7.0A/ 6.5A 4 F(5 C) 7.0A/ 6.5A ASURLF OT (Control / Release) 5.5A/ 5.0A 6.6 F(7 C) 7.0A/ 6.5A 5.6 F( C) 7.5A/ 7.0A 4 F(5 C) 8.5A/ 8.0A ASU5RLS OT (Control / Release) 7.0A/ 6.5A 6.6 F(7 C) 9.0A/ 8.5A 5.6 F( C) 0.0A/ 9.0A 4 F(5 C) 0.0A/ 9.5A OT : Outdoor Temperature [ Cooling ] ASU9RLF OT (Control / Release) OT : Outdoor Temperature ASURLF OT (Control / Release) OT : Outdoor Temperature ASU5RLS OT (Control / Release) 4.8 F(46 C) 04 F(40 C).5A/.0A 4.0A/.5A 5.5A/ 5.0A 4.8 F(46 C) 04 F(40 C) 4.0A/.5A 5.0A/ 4.5A 6.0A/ 5.5A 4.8 F(46 C) 04 F(40 C) 4.5A/.0A 6.0A/ 5.5A 8.5A/ 8.0A OT : Outdoor Temperature OT : Outdoor Temperature OT : Outdoor Temperature 0-6

20 . ANTIFREEZING CONTROL (Cooling and Dry mode) The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger temperature sensor detects the temperature lower than Temperature. Then, the anti-freezing control is released when it becomes higher than Temperature. (Table9 : Anti-freezing Protection Operation / Release Temperature) Outdoor temperature Over than 50 F(0 C) * or 5.6 F( C) * Less than 50 F(0 C) * or 5.6 F( C) * Temperature 9. F (4 C) Temperature 44.6 F (7 C) *. When the temperature rises. *. When the temperature drops F ( C) 4. COOLING PRESSURE OVERRISE PROTECTION When the outdoor unit heat exchange sensor temperature rises to 5.6 F (67 C) or greater, the compressor and the outdoor fan motor are stopped and trouble display is performed. 5. HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE ) On heating mode, the compressor frequency is controlled as following based on the detection value of the indoor heat exchanger temperature sensor. [ Control System ] Indoor heat exchange temperature 7.4 F (5 C) The compressor frequency is decreased rps every 60seconds. It returns to the normal operation F (50 C) 0-7

21 R40A WALL MOUNTED type INVERTER. TROUBLE SHOOTING

22 . TROUBLESHOOTING - ERROR DISPLAY -- WIRED REMOTE CONTROLLER DISPLAY (OPTION). SELF - DIAGNOSIS When "Er" in Temperature Display is displayed, inspection of the air conditioning system is necessary. Please consult authoilzed service personnel. Unit number (usually 0) Error code SU MO TU WE TH FR SA ex. Self-diagnosis check Error code Error contents Serial communication error Remote controller communication error Indoor unit main PCB error Manual auto switch error Room temperature sensor error Indoor unit Heat Ex. sensor error Indoor unit fan motor error Outdoor unit main PCB error PFC circuit error IPM error Discharge thermistor error Trouble shooting Outdoor unit Heat Ex. sensor error Outdoor thermistor error Current sensor error 4 Trip detection 5 Compressor motor control error 6 Outdoor unit fan motor error 7 4-way valve error 8 Discharge temperature error 9 0-0

23 . ERROR CODE HISTORY DISPLAY Up to 6 memorized error codes may be displayed for the indoor unit connected to the remote controller.. Stop the air conditioner operation.. Press the SET TEMPERATURE buttons,, [ON/OFF] simultaneously for seconds or more to start the self-diagnosis. Error code Error history number SU MO TU WE TH FR SA. Press the SET TEMPERATURE button to select the error history number. Lower Raise 0 ı F E d c b A Press the SET TEMPERATURE buttons, simultaneously for seconds or more or there is no key input for 60 seconds to stop the display. -- OUTDOOR UNIT DISPLAY. ERROR DISPLAY -. For ASU9/ RLF, 5RLS (AOU9/ RLFW, 5RLS) Error contents LED Flashing Pattern Trouble shooting Discharge temperature error Continuously lighting 9 IPM error Current sensor error Compressor motor control error Outdoor unit sensor error (Discharge or Outdoor or Heat EX.) Outdoor unit fan motor error 0.5sec ON / 0.5sec OFF sec ON / sec OFF 0.sec ON / sec OFF 0.sec ON / 0.sec OFF 5sec ON / 5sec OFF 0 4 6,, 7 0-0

24 -- INDOOR UNIT DISPLAY. ERROR DISPLAY Error contents Operation lamp (Green) Timer lamp (Orange) Economy lamp (Green) Trouble shooting Serial communication error times flash times flash Continuous flash Remote controller communication error times flash times flash Indoor unit main PCB error times flash times flash Manual auto switch error times flash 5 times flash 4 Room temperature sensor error 4 times flash times flash 5 Indoor unit Heat Ex. sensor error 4 times flash times flash 6 Indoor unit fan motor error 5 times flash times flash 7 Outdoor unit main PCB error 6 times flash times flash 8 PFC circuit error 6 times flash 4 times flash 9 IPM error 6 times flash 5 times flash 0 Discharge thermistor error 7 times flash times flash Outdoor unit Heat Ex. sensor error 7 times flash times flash Outdoor thermistor error 7 times flash 4 times flash Current sensor error 8 times flash 4 times flash 4 Trip detection 9 times flash 4 times flash 5 Compressor motor control error 9 times flash 5 times flash 6 Outdoor unit fan motor error 9 times flash 7 times flash 7 4-way valve error 9 times flash 9 times flash 8 Discharge temperature error 0 times flash times flash 9 0-0

25 - TROUBLE SHOOTING WITH ERROR CODE Trouble shooting - OUTDOOR UNIT Error Method: Serial communication error (Serial Reverse Transfer Error) Detective Actuators: Outdoor unit Main PCB Outdoor unit Fan motor Indicate or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: time Flash, Timer lamp: time Flash Economy lamp: Continuous flash. ERROR CODE : [E : ] Detective details: When the indoor unit cannot receive the serial signal from Outdoor unit more than minutes after power ON, or the indoor unit cannot receive the serial signal more than 5seconds during normal operation. Forecast of Cause:. Connection failure. External cause. Main PCB failure 4. Outdoor unit Fan motor failure Check Point - : Reset the power and operate Does Error indication show again? NO YES Check Point : Check Connection Check any loose or removed connection line of Indoor unit and Outdoor unit. >> If there is an abnormal condition, correct it by referring to Installation Manual or Data & Technical Manual. Check Point -: Check external cause such as noise Check the complete insulation of the grounding. Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave). Check Point : Check the voltage of power supply Check the voltage of power supply >> Check if AC87V (AC08V -0%) - 5V (AC0V +0%) appears at Outdoor Unit Terminal L - L. Check Point 4 : Check Serial Signal (Reverse Transfer Signal) Check Serial Signal (Reverse Transfer Signal) >> Check if Indicated value swings between AC70V and AC0V at Outdoor Unit Terminal -. >> If it is abnormal, Check Outdoor unit fan motor. (PARTS INFORMATION 5) >> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB. >> If Outdoor fan motor is normal, replace Main PCB. WHITE RED WHITE L L

26 Trouble shooting - INDOOR UNIT Error Method: Serial communication error (Serial Forward Transfer Error) Detective Actuators: Indoor unit Controller PCB Indoor unit Fan motor Indicate or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: time Flash, Timer lamp: time Flash Economy lamp: Continuous flash. ERROR CODE : [E : ] Detective details: When the outdoor unit cannot receive the serial signal from Indoor unit more than 0seconds. Forecast of Cause:. Connection failure. External cause. Controller PCB failure 4. Indoor unit Fan motor failure Check Point - : Reset the power and operate Does Error indication show again? NO YES Check Point : Check Connection Check any loose or removed connection line of Indoor unit and Outdoor unit. >> If there is an abnormal condition, correct it by referring to Installation Manual or Data & Technical Manual. Check Point -: Check external cause such as noise Check the complete insulation of the grounding. Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave). Check Point : Check the voltage of power supply Check the voltage of power supply >> Check if AC87V (AC08V -0%) - 5V (AC0V +0%) appears at Outdoor Unit Terminal L - L. Check Point 4 : Check Serial Signal (Reverse Transfer Signal) Check Serial Signal (Forward Transfer Signal) >> Check if Indicated value swings between AC70V and AC0V at Outdoor Unit Terminal -. >> If it is abnormal, replace Controller PCB. >> If it is abnormal, Check Indoor unit fan motor. (PARTS INFORMATION 4) >> If Indoor unit fan motor is abnormal, replace Indoor unit fan motor and Controller PCB. WHITE RED WHITE L L

27 Trouble shooting INDOOR UNIT Error Method: Remote controller communication error Detective Actuators: Indoor unit Controller PCB Wired Remote Control Indicate or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: time Flash, Timer lamp: times Flash Economy lamp: Continuous flash. ERROR CODE : [E : ] Detective details: When the indoor unit cannot receive the signal from Wired Remote Control more than minute during normal operation. Forecast of Cause:. Terminal connection abnormal. Wired Remote Control failure. Controller PCB failure Check Point : Check the connection of terminal After turning off the power, check & correct the followings. Check the connection of terminal between remote control and Indoor unit, and check if there is a disconnection of the cable. Check Point : Check Remote Control and Controller PCB Check Voltage at CN05 (terminal -) of UTY-XCBXZ(Communication kit). (Power supply to Remote Control) >> If it is DCV, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control >> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB Upon correcting the removed connector or mis-wiring, reset the power. 0-06

28 Trouble shooting INDOOR UNIT Error Method: Indoor unit main PCB error Indicateor or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: times Flash, Timer lamp: times Flash Economy lamp: Continuous flash. ERROR CODE : [E : ] Detective Actuators: Indoor unit Controller PCB Detective details: When power is on and there is some below case.. When model information of EEPROM is incorrect.. When the access to EEPROM failed. Forecast of Cause:. External cause. Defective connection of electric components. Controller PCB failure Check Point - : Reset Power Supply and operate Does Error indication show again? NO YES Check Point : Check Indoor unit electric components Check all connectors. (loose connector or incorrect wiring) Check any shortage or corrosion on PCB. Check Point - : Check external cause such as noise Check if the ground connection is proper. Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave). Check Point : Replace Controller PCB Change Controller PCB. Note : EEPROM EEPROM(Electronically Erasable and Programmable Read Only Memory) is a nonvolatile memory which keeps memorized information even if power is turned off. It can change the contents electronically. To change the contents, it uses higher voltage than normal, and it can not change a partial contents. (Rewriting shall be done upon erasing the all contents.) There is a limit in a number of rewriting. 0-07

29 Trouble shooting 4 INDOOR UNIT Error Method: INDOOR UNIT Manual auto switch error Indicate or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: times Flash, Timer lamp: 5 times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 5] Detective Actuators: Indoor unit Controller PCB Indicator PCB Manual auto switch Detective details: When the Manual Auto Switch becomes ON for consecutive 60 or more seconds. Forecast of Cause :. Manual auto switch failure.controller PCB and Indicator PCB failure Check Point : Check the Manual auto switch Check if Manual auto switch is kept pressed. Check ON/OFF switching operation by using a meter. >>If Manual Auto Switch is disabled (on/off switching), replace it. Check Point : Replace Controller PCB If Check Point do not improve the symptom, change Controller PCB and Indicator PCB. 0-08

30 Trouble shooting 5 INDOOR UNIT Error Method: Room Temperature Sensor Error Indicate or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: 4 times Flash, Timer lamp: time Flash Economy lamp: Continuous flash. ERROR CODE : [E : 4] Detective Actuators: Indoor unit Controller PCB Room Temperature Thermistor Detective details: When Room Temperature Thermistor open or short-circuit is detected. Forecast of Cause :. Connector connection failure.thermistor failure. Controller PCB failure Check Point : Check connection of Connector Check if connector is removed. Check erroneous connection. Check if thermistor cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check Thermistor resistance value Thermistor Characteristics (Approx. value) Temperature -0 C -5 C 0 C 5 C 0 C 5 C 0 C 5 C Resistance Value (k ) Temperature 0 C 5 C 40 C 45 C Resistance Value (k ) If Thermistor is either open or shorted, replace it and reset the power. Check Point : Check voltage of Controller PCB (DC5.0V) Make sure circuit diagram of indoor unit and check terminal voltage at Thermistor (DC5.0V) CN4 4 4 THERMISTOR (PIPE) THERMISTOR (ROOM TEMP.) If the voltage does not appear, replace Controller PCB. 0-09

31 Trouble shooting 6 INDOOR INDOOR UNIT UNIT Error Method: Indoor unit Heat Ex. sensor error Indicate or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: 4 times Flash, Timer lamp: times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 4] Detective Actuators: Indoor unit Controller PCB Heat Ex. temperature thermistor Detective details: When Heat Ex. Temperature Thermistor open or short-circuit is detected. Forecast of Cause :. Connector connection failure.thermistor failure. Controller PCB failure Check Point : Check connection of Connector Check if connector is removed. Check erroneous connection. Check if thermistor cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check Thermistor resistance value Thermistor Characteristics (Approx. value) Temperature -0 C -0 C -0 C -5 C 0 C 5 C 0 C 0 C Resistance Value (k ) Temperature 0 C 40 C 50 C 60 C 6 C Resistance Value (k ) If Thermistor is either open or shorted, replace it and reset the power. Check Point : Check voltage of Controller PCB (DC5.0V) Make sure circuit diagram of indoor unit and check terminal voltage at Thermistor (DC5.0V) CN4 4 4 THERMISTOR (PIPE) THERMISTOR (ROOM TEMP.) If the voltage does not appear, replace Controller PCB. 0-0

32 Trouble shooting 7 INDOOR UNIT Error Method: Indoor unit fan motor error Indicate or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: 5 times Flash, Timer lamp: time Flash Economy lamp: Continuous flash. ERROR CODE : [E : 5] Detective Actuators: Indoor unit Controller PCB Indoor unit fan motor Detective details: When the condition that actual frequency of Indoor Fan is below / of target frequency is continued more than 56 seconds. Forecast of Cause:. Fan rotation failure. Fan motor winding open. Motor protection by surrounding temperature rise 4. Control PCB failure 5. Indoor unit fan motor failure Check Point : Check rotation of Fan Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor) >>If Fan or Bearing is abnormal, replace it. Check Point : Check ambient temp. around motor Check excessively high temperature around the motor. (If there is any surrounding equipment that causes heat) >>Upon the temperature coming down, restart operation. Check Point : Check Indoor unit fan motor Check Indoor unit fan motor. (PARTS INFORMATION 4) >>If Indoor unit fan motor is abnormal, replace Indoor unit fan motor. Check Point 4 : Replace Controller PCB If Check Point - do not improve the symptom, replace Controller PCB. 0-

33 Trouble shooting 8 OUTDOOR UNIT Error Method: Outdoor unit main PCB error Indicateor or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: 6 times Flash, Timer lamp: times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 6] Detective Actuators: Outdoor unit Main PCB Detective details: Access to EEPROM failed due to some cause after outdoor unit started. Forecast of Cause:. External cause (Noise, temporary open, voltage drop). Main PCB failure Check Point - : Reset Power Supply and operate Does Error indication show again? NO YES Check Point : Replace Main PCB Change Main PCB. Check Point - : Check external cause Check if temporary voltage drop was not generated. Check if momentary open was not generated. Check if ground is connection correctly or there are no related cables near the power line. 0-

34 Trouble shooting 9 INDOOR OUTDOOR UNIT UNIT Error Method: PFC circuit error Detective Actuators: Outdoor unit Main PCB Indicate or Display: Outdoor Unit : No indication Indoor Unit : Operation lamp: 6 times Flash, Timer lamp: 4 times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 64] Detective details: When inverter output DC voltage is higher than 45V for over seconds, the compressor stops. If the same operation is repeated 5 times, the compressor stops permanently. Forecast of Cause :. External cause. Connector connection failure. Main PCB failure Check Point : Check external cause at Indoor and Outdoor (Voltage drop or Noise) Instant drop : Check if there is a large load electric apparatus in the same circuit. Momentary power failure : Check if there is a defective contact or leak current in the power supply circuit. Noise : Check if there is any equipment causing harmonic wave near electric line. (Neon bulb or electric equipment that may cause harmonic wave) Check the complete insulation of grounding. Check Point : Check connection of Connector Check if connector is removed. Check erroneous connection. Check if cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Replace Main PCB If Check Point, do not improve the symptom, change Main PCB. 0-

35 Trouble shooting 0 OUTDOOR UNIT Error Method: IPM error Detective Actuators: Outdoor unit Main PCB Compressor Indicate or Display: Outdoor Unit : LED 0.5sec ON/ 0.5sec OFF Indoor Unit : Operation lamp: 6 times Flash, Timer lamp: 5 times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 65] Detective details: When more than normal operating current to IPM in Main PCB flows, the compressor stops. After the compressor restarts, if the same operation is repeated within 40sec, the compressor stops again. If and repeats 5 times, the compressor stops permanently. Forecast of Cause :. Defective connection of electric components. Outdoor Fan Operation failure. Outdoor Heat Exchanger clogged 4. Compressor failure 5. Main PCB failure Check Point : Check connections of Outdoor Unit Electrical Components Check if the terminal connection is loose. Check if connector is removed. Check erroneous connection. Check if cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Check Outdoor Fan, Heat Exchanger Is there anything obstructing the air distribution circuit? Is there any clogging of Outdoor Heat Exchanger? Is the Fan rotating by hand when operation is off? >> If the Fan Motor is locked, replace it. Check Point : Check Outdoor Fan Check Outdoor Fan Motor. (Refer to Trouble shooting 7) >> If the Fan Motor is failure, replace it. Check Point 4 : Check Compressor Check Compressor. (PARTS INFORMATION ) Check Point 5 : Replace Main PCB If Check Point 4 do not improve the symptom, change Main PCB. 0-4

36 Trouble shooting INDOOR OUTDOOR UNIT UNIT Error Method: Discharge thermistor error Detective Actuators: Outdoor unit Main PCB Discharge pipe temperature thermistor Indicate or Display: Outdoor Unit : LED 0.sec ON/ 0.sec OFF Indoor Unit : Operation lamp: 7 times Flash, Timer lamp: time Flash Economy lamp: Continuous flash. ERROR CODE : [E : 7] Detective details: When Discharge pipe temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Forecast of Cause :. Connector connection failure.thermistor failure. Main PCB failure Check Point : Check connection of Connector Check if connector is removed. Check erroneous connection. Check if thermistor cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check Thermistor resistance value Thermistor Characteristics (Approx. value) Temperature -0 C -0 C -0 C -5 C 0 C 5 C 0 C 0 C 0 C Resistance Value (k ) Temperature 40 C 50 C 60 C 70 C 80 C 90 C 00 C 0 C 0 C Resistance Value (k ) If Thermistor is either open or shorted, replace it and reset the power. Check Point : Check voltage of Main PCB (DC5.0V) Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V) AOU9RLFW AOURLFW, 5RLS THERMISTOR (PIPE) THERMISTOR (DISCHARGE) 4 4 CN6 THERMISTOR (PIPE) THERMISTOR (DISCHARGE) BROWN BROWN 4 4 CN7 THERMISTOR (OUTDOOR) CN6 THERMISTOR (OUTDOOR) CN70 If the voltage does not appear, replace Main PCB. 0-5

37 Trouble shooting OUTDOOR UNIT Error Method: Outdoor unit Heat Ex. sensor error Indicate or Display: Outdoor Unit : LED 0.sec ON/ 0.sec OFF Indoor Unit : Operation lamp: 7 times Flash, Timer lamp: times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 7] Detective Actuators: Outdoor unit Main PCB Heat exchanger temperature thermistor Detective details: When Heat exchanger temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Forecast of Cause :. Connector connection failure.thermistor failure. Main PCB failure Check Point : Check connection of Connector Check if connector is removed. Check erroneous connection. Check if thermistor cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check Thermistor resistance value Thermistor Characteristics (Approx. value) Temperature -0 C -0 C -0 C -5 C 0 C 5 C 0 C 0 C 0 C Resistance Value (k ) Temperature 40 C 50 C 60 C 70 C 80 C Resistance Value (k ) If Thermistor is either open or shorted, replace it and reset the power. Check Point : Check Point : Check voltage of Main PCB (DC5.0V) Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V) AOU9RLFW AOURLFW, 5RLS THERMISTOR (PIPE) THERMISTOR (DISCHARGE) 4 4 CN6 THERMISTOR (PIPE) THERMISTOR (DISCHARGE) BROWN BROWN 4 4 CN7 THERMISTOR (OUTDOOR) CN6 THERMISTOR (OUTDOOR) CN70 If the voltage does not appear, replace Main PCB. 0-6

38 Trouble shooting OUTDOOR UNIT Error Method: Outdoor thermistor error Indicate or Display: Outdoor Unit : LED 0.sec ON/ 0.sec OFF Indoor Unit : Operation lamp: 7 times Flash, Timer lamp: 4 times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 74] Detective Actuators: Outdoor unit Main PCB Outdoor temperature thermistor Detective details: When Outdoor temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Forecast of Cause :. Connector connection failure.thermistor failure. Main PCB failure Check Point : Check connection of Connector Check if connector is removed. Check erroneous connection. Check if thermistor cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check Thermistor resistance value Thermistor Characteristics (Approx. value) Temperature -0 C -5 C -0 C -5 C -0 C -5 C 0 C 5 C 0 C Resistance Value (k ) Temperature 5 C 0 C 5 C 0 C 5 C 40 C 45 C 50 C 55 C Resistance Value (k ) If Thermistor is either open or shorted, replace it and reset the power. Check Point : Check Point : Check voltage of Main PCB (DC5.0V) Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V) AOU9RLFW AOURLFW, 5RLS THERMISTOR (PIPE) THERMISTOR (DISCHARGE) 4 4 CN6 THERMISTOR (PIPE) THERMISTOR (DISCHARGE) BROWN BROWN 4 4 CN7 THERMISTOR (OUTDOOR) CN6 THERMISTOR (OUTDOOR) CN70 If the voltage does not appear, replace Main PCB. 0-7

39 Trouble shooting 4 OUTDOOR UNIT Error Method: Current sensor error Detective Actuators: Outdoor unit Main PCB Indicate or Display: Outdoor Unit : LED sec ON/ sec OFF Indoor Unit : Operation lamp: 8 times Flash, Timer lamp: 4 times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 84] Detective details: When Input Current Sensor has detected 0A, while Inverter Compressor is operating at higher than 56rps, after minute upon starting the Compressor. (Except during the defrost operation) Forecast of Cause :. Defective connection of electric components. External cause. Main PCB failure Check Point - : Reset Power Supply and operate Does Error indication show again? NO YES Check Point : Check connections of Outdoor Unit Electrical Components Check if the terminal connection is loose. Check if connector is removed. Check erroneous connection. Check if cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point - : Check external cause at Indoor and Outdoor (Voltage drop or Noise) Instant drop : Check if there is a large load electric apparatus in the same circuit. Momentary power failure : Check if there is a defective contact or leak current in the power supply circuit. Noise : Check if there is any equipment causing harmonic wave near electric line.(neon bulb or electric equipment that may cause harmonic wave) Check the complete insulation of grounding. Check Point 4 : Replace Main PCB If Check Point, do not improve the symptom, change Main PCB. 0-8

40 Trouble shooting 5 OUTDOOR UNIT Error Method: Trip detection Indicate or Display: Outdoor Unit : LED 0.sec ON/ sec OFF Indoor Unit : Operation lamp: 9 times Flash, Timer lamp: 4 times Flash Economy lamp: Continuous flash. ERROR CODE : [E : 94] Detective Actuators: Outdoor unit Main PCB Compressor Detective details: "Protection stop by overcurrent generation after inverter compressor start processing completed'' generated consecutively 0 times. * The number of generations is reset if the start-up of the compressor succeeds. Forecast of Cause :. Outdoor unit fan operation defective, foreign matter on hear exchanger, excessive rise of ambient temperature. Inverter PCB failure. Inverter compressor failure (lock, winding short) Check Point : Check the outdoor unit fan operation, heat exchanger, ambient temperature No obstructions in air passages? Heat exchange fins clogged Outdoor unit fan motor check Ambient temperature not raised by the effect of other heat sources? Discharged air not sucked in? Check Point : Replace Main PCB If Check Point do not improve the symptom, change Main PCB. Check Point : Replace Compressor If Check Point do not improve the symptom, change Compressor. 0-9

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