19
16021730 Rev. 0
Symptom Possible
Causes
Corrective
Action
Defrost thermostat faulty
Check defrost thermostat. Replace if
failed.
Evaporator fan faulty
Check fan motor. Replace if failed.
Defrost heater remains open
Check defrost heater continuity.
Replace if failed.
Defrost control faulty
Check control and replace if failed.
Open wire or connector
Check wiring and connections.
Repair as necessary.
Refrigerant shortage or restriction
Check for leak or restriction. Repair,
evacuate and recharge system.
Supply voltage out of specification
Check input voltage. Correct any
supply problems.
Faulty fan motor
Check fan motor. Replace if failed.
Restricted air flow
Check condenser and grille for dirt.
Clean.
Frost or ice on evaporator
Refrigerant shortage or restriction
Check for leak or restriction. Repair,
evacuate and recharge system.
Troubleshooting Chart
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
!
WARNING