Westinghouse WHU09CTA21S, Service Manual, Page: 32 / 90

Troubleshooting
Troubleshooting Possible Reason
s for
Abnormality How to Deal With
Air conditioner can not start up
1. Power supply failure;
2. Trip of breaker or blow of fuse
；
3. Power voltage is too low;
4. Improper s etting of remote
controller ;
5. Remote controller is short of
power.
1. Check power supply circuit;
2. Measure insulation resistance to
ground to see if there is any
leakage;
3. Check if there is a defective
contact or leak current in the
power supply circuit;
4. Check and set remote
controller again;
5. Change batteries.
The compressor starts or
stops frequently
The air inlet and outlet has been
blocked.
Remove block obstacles.
Poor cooling/heating
1. The outdoor heat exchanger is
dirty, such as condenser;
2.
3.
There are heating devices indoors
；
The air tightness is not enough.
People come in and out too
frequently.
4. Block of outdoor heat exchanger;
5. Improper set ting of temperature.
1. Clean the heat exchanger of the
outdoor unit, such as condenser ;
2. Remove heating devices;
3. Keep certain air tightness indoors;
4. Remove block obstacles;
5. Check and try to set temperature
again.
Sound from deforming parts
During system starting or stopping, a
sound might be heard. However, this
is due to thermal deformation of
plastic parts.
It is not abnormal, and the sound will
disappear soon.
Water leakage
1. Drainage pipe is blocked or
broken;
2. Wrap of refrigerant pipe joint is not
close d completely .
1. Change drainage pipe.
2. Re-wrap and make it tight.
Troubleshooting according to fault codes
When the air conditioner failure occurs, the fault code will display on control board, wire d controller or
display panel.
How to check fault codes
Indoor
u
nit
(1) Fault codes indicated by wire d controller
FIG 1 . FAULT CODE DISPLAY ON WIRE REMOT CONTROLLER
Troubleshooting for
n
ormal
m
alfunction
Trouble guide
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