Table 4-2. TROUBLESHOOTING FOR UNIT MAINTENANCE
TEST OR INSPECTION
Step 7. Test electrical components.
Replace components as required.
Step 1. Check that power supply is connected.
Connect power supply.
Step 2. Check that CIRCUIT BREAKER (CB) has been RESET.
RESET CIRCUIT BREAKER.
Step 3. Check motor bearings and fans by:
Disconnect power supply from air conditioner.
Rotate the blower wheels by hand to see if the bearings are frozen or if shaft is bent, or if
fans are loose or broken.
Replace defective motor.
Step 4. Move mode selector switch to each of the four positions: COOL, VENTILATE, LO HEAT, and HI HEAT. Move
mode selector switch to VENTILATE.
High voltage in air conditioner can kill.