Service manual

40
(d)Check fuse on PCB Ass’y in indoor unit
Check fuse on PCB Ass’y in
indoor unit for continuity.
Measure resistance of
indoor fan motor winding.
Measure coil resistance of power
relay or magnetic contactor in
outdoor unit.
Measure resistance of drain
pump winding.
PCB Ass’y in indoor unit is
defective.
Measure resistance of
primary winding of
transformer.
If fuse blows, there is a possibility of short circuit.
OK
OK
OK
e) Check transformer in indoor unit
Check whether transformere is
detective.
Measure resistance of primary and
secondary winding.
f) Check indoor fan motor protector
Wait for 30 minutes and then try to run.
Indoor fan motor internal protector trips.
Air conditioner starts running.
Air conditioner does not run again.
Check fan rotation. Turn
fan gently once or twice
by hand.
Remove foreign matter
or repair.
Check fan casing for
foreign matter on inside.
Fan motor burnout or
foreign matter in bearing.
Repair or replace.
Fan cannot
be turned
4) ONLY OUTDOOR UNIT DOES NOT RUN
a) Outdoor unit does not run when air conditioner is in following conditions.
•During thermo OFF.
•During freeze prevention (for at least 6 minutes).
•During drain pump works (for at least 12 minutes).
b) PCB Ass’y in indoor unit is defective.