Hitachi RAS-(4-12)HRNM(2)(E) - Heating Overload (High Pressure Switch will be Activated) for IVX Series

8 Troubleshooting
258
SMGB0064 rev.0 - 08/2011
Alarm code
42
Heating Overload (High pressure switch will be activated) for IVX Series
• The RUN LED ickers 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?
Faulty PCB1.
No
Yes
Is the voltage
between PCN9#1 and
#3 220V/240V?
No
Is protection device
activated?
No
Is CMC ON
more than
3 seconds?
Yes
No
Faulty PCB1.
YesYes
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.