Hitachi RAS-5HVRNM1E Service Manual page 266

8 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.
– This alarm code is indicated when the protection device is activated at following condition. Liquid refrigerant piping
temperature of indoor unit is more than 55 ºC and top of compressor temperature is more than 95 ºC.
Is CMC
ON?
Yes
Is CMC ON
more than
3 seconds?
Yes
Check the following value by remote control switch.
1. Top of compressor temperature: 95ºC or less
2. Liquid refrigerant piping temperature of indoor unit: 55ºC or
less If exceeding the above value, repair it.
258
SMGB0060 rev. 1- 12/2010
Heating Overload (High pressure switch will be activated) for IVX Series
Is the voltage
No
between PCN9#1 and
#3 220V/240V?
Yes
No
No
No
Is protection device
activated?
Yes
Faulty PCB1.
Faulty PCB1.