32
Symptom Possible Causes Corrective Action
Air in system
Check for low side leak. Repair, evacuate and recharge
system.
Unit runs
Ice on evaporator
See “Ice on evaporator.”
continuously.
Temperature
normal
Noisy operation
Loose flooring or floor not firm
Repair floor or brace floor.
Cabinet not level
Level cabinet.
Tubing in contact with cabinet,
Adjust tubing.
other tubing or other metal
Drip tray vibrating
Adjust drain pan.
Fan hitting another part
Ensure fan properly aligned and all attaching hardware and
brackets are tight and not worn. Tighten or replace.
Worn fan motor bearings
Check motor for loss of lubricant or worn bearings.
Replace
if
necessary.
Compressor mounting grommets
Tighten hardware. Replace grommets if necessary.
worn or missing; mounting
hardware loose or missing.
Free or loose parts causing or
Inspect unit for parts that may have worked free or loose
allowing noise during operation
or missing screws. Repair as required.
Frost or ice on
Evaporator fan faulty
Check fan motor. Replace if defective.
evaporator
Defrost heater remains open
Check defrost heater continuity. Replace if faulty.
Defrost thermostat faulty
Check defrost thermostat and replace if faulty.
Open wire to connector
Check wiring and connections. Repair as necessary.
Refrigerant shortage or restriction
Check for leak or restriction. Repair, evacuate and
recharge
system.
Unit starts and
Loose wire or thermostat
Check wiring and connections. Repair as necessary.
stops frequently
connections
(cycles on & off)
High ambient temperature
Consumer education.
Supply voltage out of
Check input voltage. Correct and supply problems.
specifications.
Overload protector open
Check overload protector for continuity. If open, replace
overload.
NOTE:
Ensure overload / compressor are below
trip temperature before testing.
Faulty compressor motor
Check capacitor for open / short. Replace if necessary.
capacitor
NOTE
: Discharge capacitor before testing.
Faulty compressor
Test and replace compressor if faulty.
Faulty fan motor
Check fan motor. Replace if necessary.
Restricted air flow
Check condenser and grille for dirt. Clean.
Refrigerant shortage or restriction
Check for leak or restriction. Repair, evacuate and
recharge
system.
