Hitachi RAS-H(V)RNME-AF Service Manual page 382

12 Troubleshooting
42
Alarm code
• The RUN LED flickers and "ALARM" is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit
number and the alarm code are displayed on the display of the outdoor unit PCB.
Abnormality indication will appear when the protection device is activated during compressor operation at hea-
-
ting, with the indoor unit liquid refrigerant (piping) temperature higher than 55 °C and the compressor-top tempe-
rature higher than 95 °C.
RY1 turns
No
ON at operation
startup? Compressor
operates?
Yes
Does RY1
remains ON for
more than three
seconds?
Yes
Check the temperature of the following places with the remote control
switch in checking mode.
Check the temperature of [1] compressor top temperature and [2] indoor
unit liquid refrigerant (piping) temperature. Examine the cause and address
the problem if the measurements surpass the preset temperature.
1 Compressor top temperature: 95ºC or less
2 Indoor unit liquid refrigerant (piping) temperature: 55ºC or less
372
SMGB0070 rev. 1 - 08/2011
Heating Overload (High pressure switch will be activated) (RAS-2HVRN2)
[Detected (Approx. 15 V)]
Voltage bet-
ween pins #1
and #3 of DIP-IPM
connector PCN401
approx. 0V at ope-
ration startup?
Yes
No
Protec-
No
tion device
remains activa-
ted?
Yes
No
Yes
PCN401
correctly
connected?
No
Check DIP-IPM
connector wiring
Faulty DIP-IPM