Hitachi RAS-5182CH Service Seite 80

TROUBLE-SHOOTING
No cooling or Heating
; 1* Before using the service switch, disengage
"No operation at all. and engage the plug. Do not operate the
bee s i e t e eset remote controller.
Operates by setting the service | oo aes
switch to forced cooling? S Check the following parts and replace if faulty
1) Current fuse Remove and check the continuity across.
2).. Varistor Check whether the appearance is blackish or not.
The resistance must be infinite: *2
Thereafter, check the secondary voltage
(approx. 20V AC). ~~ :
Check the continuity between contacts.
5) Thermal fuse for | (76°C) Continuity across. If there is no
therminal board | continuity, also check the fan motor and capacitor.
6) Thermal fuse for | (96°C) Continuity across > If there is no continuity,
Electric parts check the electric parts and replace if abnormal.
Return the service switch to
"Normal".
3) Transformer
4) Power switch
Set the remote controller to an
operation status and press the
ON/OFF button.
*2 Before checking the varistor, detach a terminal.
Is the level LO (approx. 0.5V)
between driver IC 2 pin @6 power Power relay abnormal Replace Power relay
relay and OV?
YES
Compressor does not turn at LO.
Is the level LO (approx. 0.5V)
between driver IC 2 pin @ stick (Sick relay abnormal (Sick relay abnormal abnormal Replace Stick [_Rerlece Stick relay
relay and OV? whe
Is the level HI (more than 3V) Micro computer abnormal
IC601 pin at @ MED fan speed?
NO
C» IC 601 abnormal
NO
Is voltage normal between Blue Indoor fan motor, Q801
and Red of The CN6? or Q802 abnormal
YES
Is the level LO (approx. 0.5V)
between driver 1C701 pin @ a valve eae Reversing
(Reversing valve relay) and OV at a abnormal valve eae
heating operation? YES