Hitachi RAC-25JX4, Service Manual

Page: 90 / 119

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Is the indoor unit "timer lamp" blinking?
Yes
Yes
Yes
No
No
No
Trouble shoot according to the
self-diagnosis lighting mode.
Run the unit using the following remote controller settings:
In the cooling season, set the temperature to 16
℃
in the cooling
mode.
In the heating season, set the temperature to 32
℃
in the heating
mode.
Does the operation lamp light or blink?
Open the indoor unit and check the voltage
between pins Nos.1 and 3 of CN3 on the
indoor unit control P.W.B.
Normal: DC35V (32-38V)
Red
Brown
Is the voltage correct?
Is the compressor running?
Check if the connecting cable
connected incorrectly? inserted
incompletely? or disconnected?
Not running Running
Open the outdoor unit and observe the self-diagnosis
lamp (LD301). Count howmany times the lamp blinks.
Blinks other than 1 time. Blinks 1 time.
Can the unit be operated using the outdoor unit
service switch?
(See the nameplate on the outdoor unit for operating
instructions.)
Check the outdoor
electrical parts.
Check the indoor
electrical parts.
Check the refrigerating cycle.
In the event of overload limit cut or OH
thermistor temperature rise, use the
self-diagnosis memory function because
such failure may evade detection due to
ambient temperature variations or other
factors.
No
Yes