– 62 –
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 or heating
Power relay abnormal
YES
Check the continuity between contacts.
3) Power switch
4) Thermal fuse for
therminal board
(96°C) Continuity across
➝ If there is no continuity,
also check the fan motor and capacitor.
(102°C) Continuity across
➝ If there is no continuity,
check the electric parts and replace if abnormal.
5) 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 IC701 pin
11
power
relay and 0V?
NO
Is voltage normal between Blue and
Red of the CN6? *3
NO
YES
Compressor does not turn at LO.
YES
Indoor fan motor or
Q904 abnormal
Replace Power relay
YES
Is the level LO (approx. 0.5V)
between driver IC 701 pin
13
(Reversing valve relay) and 0V at
heating operation?
NO
Reversing valve
relay abnormal
Replace Reversing
valve relay
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