GENERAL TROUBLESHOOTING

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1 Compressor will not Start no hum Compressor will not start hums but trips on overload Line disconnect switch open Overload protector tripped Control stuck in open position Control off due to cold location Wiring improper or loose Improper wiring Low Voltage Start capacitor defective Relay failed Compressor motor has a winding open Internal mechanical problem in the compressor Liquid refrigerant in compressor Check power from outlet. Unplug and plug in unit. Replace fuse Replace the Overload Repair or replace control Re-assure the control probe location Replace the start failed capacitor Replace the failed relay Add crankcase heater and / or accumulator

2 Compressor starts, but does not switch off of start winding Compressor starts and runs, but short cycles on the overload protector Improper wiring Low voltage Relay failed Run capacitor failed Excessive high discharge temperature Compressor failed Excess current passing through overload Low / unstable voltage Overload failed Capacitor fault Excessive discharge Suction pressure too high Compressor overheating Compressor electrical fault Replace relay Replace capacitor Check for over charge or condenser blockage / condenser fan failure Check wiring diagram for wrong connections of electrical components Replace overload Replace capacitor Check for over charge or condenser blockage / condenser fan failure Check refrigerant charge

3 Units runs OK, But short cycles Overload protection Thermostat Unit operates long Less refrigerant Probe location Excessive load Evaporator coil iced up Restriction in refrigeration system Condenser is dirty or blocked Filter is dirty Warm temperature Control setting at warm Inadequate air circulation Check the wiring Replace the overload Change the thermostat setting if required Fix leak & add charge Correct the probe location Replace with larger system Defrost Determine location and clean Clean condenser Clean / Replace filter Reset the controller setting to colder Improve air movement

4 Problem Possible Cause Solution Blowing Fuse Power cord is cut and grounding out Defective Compressor Defective Overload High Voltage Low Voltage Suction line frosted Evaporator fan not working Overcharged system Replace power cord Replace overload Correct voltage condition Ensure cooler plugged into dedicated supply with properly sized circuit. (Correct voltage condition) Determine reason or replace if required Correct the charge Leaking Water Very Humid Conditions Blocked Drain Door not sealed properly / Top door seal Clear blocked drains?? Repair/Replace door gaskets, realign/seal doors.

5 Problem Possible Cause Solution Evaporator Freeze Up Controller miscommunication Temperature Controller set too cold Blocked/Restricted Air Flow Defective Evap Motor/ Running at low speed Blocked Drain Low refrigerant charge Open Door or door not sealed properly Defective or open gasket on Cooling Deck Deck not in locked position Internal controller failure Voltage spike Adjust to higher temperature setting (lower number) Remove source of blockage Replace Evap Motor Clear blocked drain Repair/Recharge system Repair/Seal air leaks Replace defective or damaged gasket Lock deck in position and secure with locking bar Replace Controller & Probe

Compressor - Loss of oil, Loss of oil pressure, or Cuts off on oil pressure control.

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