Service Manual 23
Troubleshooting Guide
Room Air Conditioner Voltage Limits
NAME PLATE RATING
MINIMUM
MAXIMUM
115V ± 10%
103.5V
126.5V
COMPLAINT CAUSE
REMEDY
Fan motor will not run.
No power
Check voltage at outlet. Correct if none.
Power supply cord
Check voltage to rotary switch. If none, check
power supply cord. Replace cord if circuit is
open.
Rocker switch
Check switch continuity. Refer to wiring diagram
for terminal identification. Replace switch if
defective.
Wire disconnected or
Connect wire. Refer to wiring diagram for
connection loose
terminal identification. Repair or replace loose
terminal.
Capacitor (Discharge
Test capacitor.
capacitor before testing.)
Replace if not within ±10% of manufacturer's
rating. Replace if shorted, open, or damaged.
Will not rotate
Fan blade hitting shroud or blower wheel hitting
scroll. Re-align assembly.
Units using slinger ring condenser fans must
have 0.22~0.25 inch clearance to the base.
If necessary, shim up the bottom of the fan motor
with mounting screw(s).
Check fan motor bearings; if motor shaft will not
rotate, replace the motor.
Fan motor runs.
Revolves on overload
Check voltage. See limits on this page.
If not within limits, call an electrician.
Test capacitor.
Check bearings. Does the fan blade rotate
freely?
If not, replace fan motor.
Pay attention to any change from high speed to
low speed. If the speed does not change,
replace the motor.
