Hitachi RAC-10G5, Service Manual, Page: 54 / 62

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Fan Speed
*3
CN5 BLUE-RED (V)
HI
MED
LO
SLEEP MODE
RAS-10G5
RAC-10G5 RAS-14G5
RAC-14G5
Cool
23.0
19.0
15.6
11.9
Cool
30.3
25.6
20.0
13.5
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 infi nite. *2
No cooling
Power relay abnormal
YES
Check the continuity between contacts. 3) Power switch
*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.
NO
YES
Compressor does not turn at LO.
YES
Indoor fan motor or
ICP1 or Q109 abnormal
Replace Power relay
Is voltage normal (approx. 280 ~
380V) at out put side of the DB1?
Check the circuit board
of control board
YES
NO
Replace control P.W.B.
*3 Refer to below table.
Replace faulty part
*4 Wait for 3 minutes before forced
re-operation by the service switch.