13. Troubleshooting. Indoor unit s LED indication of Corona DC inverter unit. Indoor unit s LED indication of Alfa DC inverter unit
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1 Troubleshooting 13. Troubleshooting Indoor unit s LED indication of Corona DC inverter unit MCAC-HTSM E0 E1 E2 E3 E5 E6 P0 P1 P2 P3 P5 EEPROM error outdoor communication error Zero-crossing examination error Fan speed beyond control Outdoor units temp. sensor or connector of temp. sensor is defective Indoor units temp. sensor or connector of temp. sensor is defective Inverter module protection Outdoor voltage protection Compressor top protection against temperature Compressor current protection Outdoor low temp. protection Indoor unit s LED indication of Alfa DC inverter unit E0 E1 E2 E3 E5 E6 P0 P1 P2 P3 EEPROM error outdoor communication error Zero-crossing examination error Fan speed beyond control Outdoor units temp. sensor or connector of temp. sensor is defective Indoor units temp. sensor or connector of temp. sensor is defective Inverter module protection Outdoor voltage protection Compressor top protection against temperature Compressor current protection Indoor unit s LED indication of Vertu DC inverter unit E0 E1 E2 E3 E5 E6 P0 P1 P2 P3 P4 P5 EEPROM error outdoor communication error Zero-crossing examination error Fan speed beyond control Outdoor units temp. sensor or connector of temp. sensor is defective Indoor units temp. sensor or connector of temp. sensor is defective Inverter module protection Outdoor unit voltage protection Compressor top temperature protection Outdoor low temp. protection Inverter compressor drive protection Mode conflict protection Indoor unit trouble shooting Indoor unit display E0 EEPROM error 108 Outdoor Units
2 MCAC-HTSM Troubleshooting Circuit or software error on indoor PCB Replace indoor PCB Indoor unit display E1 outdoor communication error Disconnect the power supply, after 1 minute, connect the power supply, turn on the unit with remote controller Does the unit work normally? Check the wiring between indoor and outdoor unit. Is the connection of L, N, S and GND good? Is the GND connection on outdoor PCB good? Reconnect and retest again Is the LED4(red) on indoor display board bright and LED1(yellow) blinking? Replace indoor PCB and repower on. Is the failure The power supply for outdoor PCB is fail. Check the wiring on outdoor PCB comparing with wiring plate. Is the connection good? Correct the connection. Replace outdoor e-box. Outdoor Units 109
3 Troubleshooting MCAC-HTSM Indoor unit display E2 Zero-crossing examination error Is power supply connection connectors good? and of Be sure the power supply is good and correct the Indoor PCB is defective. Replace the indoor PCB. Indoor unit display E3 Fan speed beyond control Is the indoor fan motor connector and connection good? Repair the reconnect connector and Is voltage being applied to the fan motor? (rang 90v-160v between mid pin and N on CN1 Indoor PCB is defective. Replace the indoor PCB. Replace the indoor fan motor 110 Outdoor Units
4 MCAC-HTSM Troubleshooting Indoor unit display E5 Outdoor units temp. sensor or connector of temp. sensor is defective Is the outdoor temperature sensor connector and connection good? Replace the sensor and check if E5 display again? Repair the connector and reconnect Replace outdoor e-box Indoor unit display E6 Indoor units temp. sensor or connector of temp. sensor is defective Is the indoor temperature and evaporator sensor connector and connection good? Repair the connector and reconnect Replace the sensor and check if E6 display Replace the PCB Outdoor Units 111
5 Troubleshooting MCAC-HTSM Indoor unit display P0 Inverter module protection Is voltage normal? Is all connection good? Revise the power and retest. Revise the power and retest. Is the wiring to compressor right? Check the moduler if some components blow out or be failure? Repair or replace the moduler. Is it breakdown between P-N, P-V, P-W, N-V,N-W or V-W of inverter moduler? Replace the moduler. Check the compressor. Indoor unit display P1 Outdoor voltage protection Is the power supply good? Be sure the power supply is normal when using the units Replace the outdoor E-box 112 Outdoor Units
6 MCAC-HTSM Troubleshooting Indoor unit display P2 Compressor top protection against temperature Does compressor operate? Is connection good? the Reconnect and retest. Is refrigerant circulation volume normal? Is protector normal? Replace the protector. Charge refrigerant Check the outdoor main PCB. Is there some problem? Is abnormality the same after gas charging? Replace the outdoor PCB Check refrigerant system (such as clogging of capillary, etc) The trouble shooting of the P3,P4,P5 protection are the same as the outdoor unit,please refer to the outdoor trouble-shooting. Outdoor Units 113
7 Troubleshooting MCAC-HTSM Outdoor unit s LED indication E0 E1 E2 E3 E4 E5 E6 E7 P0 P1 P2 P3 P4 P5 P6 P7 P8 Explanation EEPROM error 1 Indoor units pipe temp. Sensor or connector of pipe temp. sensor is defective 2 Indoor units pipe temp. Sensor or connector of pipe temp. sensor is defective 3 Indoor units pipe temp. Sensor or connector of pipe temp. sensor is defective Outdoor temp. Sensor or connector of temp. sensor is defective Compressor voltage protection 4 Indoor units pipe temp. Sensor or connector of pipe temp. sensor is defective Communication malfunction between outdoor IC and DSP Compressor discharge temperature protection High pressure protection Low pressure protection Compressor current protection Module protection Outdoor low temp. protection Condenser high-temperature protection reserve reserve E0 EEPROM Malfunction Install the EERROM again Does the trouble occur again? Trouble is solved Replace the outdoor main board 114 Outdoor Units
8 MCAC-HTSM Troubleshooting E1 1 Indoor units pipe temp. Sensor or connector of pipe temp. sensor is defective E1(indoor unit) Is connection to connector of pipe temp. Sensor good? Repair connector Check the resistance of the temp. sensor according to Annex 1 Is the resistance normal? Replace the sensor Change main board Outdoor Units 115
9 Troubleshooting MCAC-HTSM E2 2 Indoor units pipe temp. Sensor or connector of pipe temp. sensor is defective E2(indoor unit) Is connection to connector of pipe temp. Sensor good? Repair connector Check the resistance of the temp. Sensor according to Annex 1 Is the resistance normal? Replace the sensor Change main board E3 3 Indoor units pipe temp. Sensor or connector of pipe temp. sensor is defective E3(indoor unit) Is connection to connector of pipe temp. sensor good? Repair connector Check the resistance of the temp. Sensor according to Annex 1 Is the resistance normal? Replace the sensor Change main board 116 Outdoor Units
10 MCAC-HTSM Troubleshooting E4 Outdoor temp. Sensor or connector of temp. sensor is defective E4 Is connection to connector of Outdoor temp. Sensor good? Repair connector Check the resistance of the temp. Sensor according to Annex 1 Is the resistance normal? Replace the sensor Change main board E5 Compressor Voltage protection Check the voltage of power supply, if the voltage is about V? Replace the outdoor main board Correct the supply power s voltage in this range Outdoor Units 117
11 Troubleshooting MCAC-HTSM E6 4 Indoor units pipe temp. Sensor or connector of pipe temp. sensor is defective E3(indoor unit) Is connection to connector of pipe temp. Sensor good? Repair connector Check the resistance of the temp. Sensor according to Annex 1 Is the resistance normal? Replace the sensor Change main board E7 Communication malfunction between outdoor IC and DSP E7(outdoor unit) Change main board 118 Outdoor Units
12 MCAC-HTSM Troubleshooting P0 Compressor discharge temperature protection When Compressor discharge temp. is more than 115 C, the unit will stop, and unit runs again when Compressor discharge temp. less than 90 C. Is the Compressor discharge temp. more than 115 C? Is the wiring connection is right between Compressor discharge temp. sensor and PCB according to Wiring diagrams Correct the wiring connection Is the resistance of remp. sensor is right Replace the Compressor discharge temp. Replace the outdoor main board Correct the voltage and frequency Check whether the voltage and frequency is normal. Check whether the refrigerant is leakage. recharge refrigerant Outdoor Units 119
13 Troubleshooting MCAC-HTSM P1 High pressure protection Outdoor master unit display P1; indoor unit alarm lamp flash slowly High/low pressure stop valve opened completely or not? OK Error disappear High pressure range during unit operating is correct? Drop redundant refrigerant The wire between pressure switch and main board works well? Replace it Error disappear Pressures switch work well? Replace high pressure switch Error disappear piping (filter, accumulator), 4-way and EXV work well? Replace Error disappear Is pipe blocked? drop refrigerant, blow pipe, recharge with refrigerant. 120 Outdoor Units
14 MCAC-HTSM Troubleshooting P2 Low pressure protection Outdoor master unit display P2; indoor unit alarm lamp flash slowly High/low pressure stop valve opened completely or not? OK Error disappear Low pressure range during unit operating is correct? Charge refrigerant The wire between pressure switch and main board works well? Replace wire Error disappear Pressures work well? switch Replace pressure switch Error disappear piping (filter, accumulator), 4-way and EXV work well? Displace Error disappear Is pipe blocked? drop refrigerant, blow pipe, recharge with refrigerant. Outdoor Units 121
15 Troubleshooting MCAC-HTSM P3 Compressor current protection Check the resistance of compressor, normally U and V is 1 ohm U and W is 1 ohm V and W is 1ohm The compressor is defective Check the refrigerant circulation volume and pressure Recharge the refrigerant If refrigerant circulation volume and pressure is OK, change the outdoor main PCB. 122 Outdoor Units
16 MCAC-HTSM Troubleshooting (LED flashes for thirteen times) P4 Module protection Check the connectors CN4, CN1 in outdoor PCBs Is connection to connector good? Whether the input voltage range is V? Is the wires to compressor right Repair connector or Correct voltage Unplug the wiring to compressor, then restart, whether display the P4 again? Change main board Check compressor Turn on the unit in cooling or heating in different season, use a frequency meter to test the frequency in one of the three wires to compressor, if there is frequency in wires, but compressor do not run, the compressor is defective. Between U, V, W three terminals, the resistance is ~1 Ώ. Outdoor Units 123
17 Troubleshooting MCAC-HTSM P5 Outdoor low temperature protection When outdoor temp. is lower than -15 C for more than 1 hour, the unit will stop, when the outdoor temp. is higher than -12 C for more than 10 minutes and the compressor has stopped for more than 1 hour,or the outdoor temp. is higher than 5 C for more than 10 minutes, the unit will be started again. Is the Condenser high temp. more than 65 C? Is the Condenser high temp. sensor right according to the annex 1. Replace the outdoor main board Replace the outdoor pipe temp sensor The outdoor temp. is too high(more than 43 ) The system is blocked? Or EXV is invalid? Correct the problem or replace the EXV. 124 Outdoor Units
18 MCAC-HTSM Troubleshooting P6 Condenser high temperature protection When Condenser high temp. is more than 65 C, the unit will stop, and unit runs again when outdoor pipe temp. less than 52 C. Is the Condenser high temp. more than 65 C? Is the Condenser high temp. sensor right according to the annex 1. Replace the outdoor main board Replace the outdoor pipe temp sensor The outdoor temp. is too high(more than 43 ) The system is blocked? Or EXV is invalid? Correct the problem or replace the EXV. Remark: 1. Test digital discharge temperature, outdoor condenser temperature T3 2. Test system pressure 3. High digital discharge temperature is likely owing to the lack of refrigerant, air leakage or system blockade. Check the above items respectively to solve the problem. 4. Condenser high temperature protection owes to the overcharge of refrigerant, air leakage or bad ventilation and heat-emission conditions. Outdoor Units 125
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