Haier HW-12C03 Service Manual page 89

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
Insufficient cooling
Excessive noise
No cooling.
RS4110008 Rev.0
Possible Causes
Vent screen installed in
partition panel.
Unit undersized for area/
room.
Outside coil fan blade or
inside coil blower wheel
loose or improperly
aligned.
Compressor mounting
hardware loose or
grommets worn.
Free parts, loose screws
causing or allowing
excessive vibration.
Worn fan motor bearings.
Fan motor mounting
hardware/bracket loose or
grommets worn (if
applicable).
Copper tubing improperly
dressed or routed.
Compressor internal noise.
Low refrigerant charge or
leak in sealed system.
Blockage (restriction) in
sealed system.
Rotary control failed.
Compressor failed.
WARNING
Corrective Action
Remove vent screen and install vent plug in partition panel.
Reduce area being cooled or replace unit with larger
capacity model.
Check fan blade/blower wheel for proper position.
Reposition if necessary. Ensure hardware attaching fan
blade/blower wheel to motor shaft is tight. Tighten if loose,
replace if stripped.
Check mounting bolts for tightness. Tighten if necessary.
Inspect grommets for wear. Replace if necessary.
Inspect unit for parts that may have worked free, loose/
missing screws, other problems that may cause
excessive vibration. Repair as required.
Check bearings for wear/loss of lubricant. Replace motor if
either condition is found.
Check mounting bolts/bracket for tightness. Tighten if
necessary. Inspect grommets for wear. Replace if
necessary.
Inspect copper tubing for excessive vibration. Secure
tubing as required.
Inspect compressor for proper operation. Replace as
required.
Test sealed system for proper charge. Ensure system is
free of leaks. Repair as required.
Evacuate sealed system. Remove blockage, recharge.
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.
Check compressor motor windings for open shorts. Check
compressor seals. Perform compressor direct wiring test.
Replace compressor if failed.
92