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TROUBLE-SHOOTING
No operation at all.
*1
*1 Before using the service switch,
disengage and engage the plug. Do not
operate the remote controller.
Check the following parts and replace if faulty
Remove and check the continuity across.1) Current fuse
2) Varistor
Check whether the appearance is blackish or not.
The resistance must be infinite. *2
No cooling
Power relay abnormal
YES
Check the continuity between contacts.3) Power switch
(102°C) Continuity across
→
If there is no continuity,
check the electric parts and replace if abnormal.
4) Thermal fuse for
Terminal board
*2 Before checking the varistor, detach a terminal.
NO
Operates by setting the service
switch to forced cooling?
Return the service switch to
"Normal".
Set the remote controller to an
operation status and press the ON/
OFF button.
Is the level LO (approx. 0.5V)
between driver IC501 pin
10
power
relay and 0V?
NO
Is voltage normal between Blue wire
and Red wire of Indoor DC Fan
Motor *3
NO
YES
Compressor does not turn at LO.
YES
Indoor fan motor or
Q903 abnormal
Replace Power relay
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