Hitachi RWM-(H)FSN3E, Service Manual

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12 Troubleshooting
SMGB0070 rev. 1 - 08/2011
381
12
Alarm code
53
Transistor module protection activation (RAS-2HVRN2)
• 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.
- This alarm is displayed when the inverter PCB or DIP-IPM module detects the abnormal operation 7 times or
more than 7 times in 30 minutes. The retry operation is performed six times.
Conditions:
The abnormal current to the inverter PCB or DIP-IPM, such as short-circuited, grounded, overcurrent or control voltage
decrease.
Check the compressor.
(If there is a short-circuit
between phase lines or groun-
ded from any phase, replace
the compressor.)
No
Turn off power of inverter components,
disconnect U, V, W from compressor
terminals. Turn ON pin 1 of DSW1 on PCB1.
Does it trip? *2)
Is the heat exchanger of outdoor
unit clogged?
Remove clogging.
Replace the electrical box
Yes
Yes
No