Haier HW-12C03 Service Manual page 88

Troubleshooting Information
To avoid risk of electrical shock, personal injury, or death,disconnect electrical power source to unit and discharge
capacitor through a 10,000 ohm resistor before attempting to service, unless test procedures require power to be
connected. Ensure all ground wires are connected before certifying unit as repaired and/or operational.
Symptom
Compressor does not run,
fan motor operates
normally.
Compressor cycles on
and off.
Insufficient cooling
Possible Causes
Wire(s) disconnected or
loose
Compressor motor
capacitor failed.
Compressor failed.
Overload protector open.
Rotary control failed.
Wire(s) disconnected or
loose.
Supply voltage out of
specification.
Overload protector open.
Restricted air flow.
Fan motor failed.
Compressor motor
capacitor failed.
Sealed refrigerant system
failure.
Low refrigerant charge.
Restricted air flow.
WARNING
Corrective Action
Ensure all connections are tight and secure. Correct as
required.
Check capacitor for open/short. Replace if failed.
NOTE: Discharge capacitor before testing.
Check compressor motor windings for open/short. Replace
compressor if failed.
Check protector for continuity. If open, replace.
NOTE:Ensure compressor/overload are below trip
temperature before testing.
Ensure all control connections are tight and secure. Check
control for proper operation. Replace if failed.
NOTE:Eliminate all other possible causes before
replacing rotary control.
Ensure all connections are tight and secure. Correct as
required.
Check input voltage for proper levels. Take appropriate
action if voltage levels out of specification.
Check protector for continuity. If open, replace.
NOTE:Ensure compressor/overload are below trip
temperature before testing.
Inspect air filter, indoor/outdoor coil for dirt. Clean as
required. Check fins on coils for damage. Straighten fins if
bent, attempt other repairs as necessary. Replace
coil if repairs cannot be made.
Check fan motor for proper operation. Replace if failed.
Check capacitor for open/short. Replace if failed.
NOTE:Discharge capacitor before testing.
Test sealed system for proper charge, leaks, and
restrictions. Repair as required.
Test sealed system for proper charge. Ensure system is
free of leaks. Repair as required.
Inspect air filter, indoor/outdoor coil for dirt. Clean as
required. Check fins on coils for damage. Straighten fins if
bent, attempt other repairs as necessary. Replace coil if
repairs cannot be made.
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RS4110008 Rev.0