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TROUBLE-SHOOTING
No cooling or heating
Operates by setting the service
switch to forced cooling?
YES
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
relay and 0V?
NO
Is voltage normal between Blue and
Red of the CN6?
NO
Is the level LO (approx. 0.5V)
between driver IC 701 pin
(Reversing valve relay) and 0V at
heating operation?
NO
No operation at all.
*1
NO
1) Current fuse
2) Varistor
3) Power switch
4) Thermal fuse for
therminal board
5) Thermal fuse for
Terminal board
power
11
Power relay abnormal
YES
Compressor does not turn at LO.
*3
YES
Reversing valve
13
relay abnormal
YES
*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.
Check whether the appearance is blackish or
not.
The resistance must be infinite. *2
Check the continuity between contacts.
(96°C) Continuity across
also check the fan motor and capacitor.
(102°C) Continuity across
check the electric parts and replace if abnormal.
*2 Before checking the varistor, detach a terminal.
Indoor fan motor or
Q904 abnormal
– 62 –
➝
If there is no continuity,
➝
If there is no continuity,
Replace Power relay
Replace Reversing
valve relay
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