Excessively High Discharge Gas Temperature At The Top Of Compressor For Ivx Series - Hitachi RAS-(3-6)HVRNM2E Service Manual

8 Troubleshooting
08
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 is indicated when the temperature of the thermistor on the top of the compressor is maintained higher
than 127 °C for 10 minutes or higher than 140 °C for 5 seconds under cooling operation (1).
- This alarm is indicated when the temperature of the thermistor on the top of the compressor is maintained higher
than 120 °C for 10 minutes or higher than 140 °C for 5 seconds under heating operation (1)
N O T E
(1) For RAS-3HVRNM2E the temperature is 115 ºC and 125 ºC in cooling and heating mode
Is the thermistor on top of
compressor normal?
Yes
Is the thermistor installed
correctly on the compressor?
Yes
Is gas leaking?
Yes
Thermistor
resistance (kΩ)
233
SMGB0064 rev.0 - 08/2011

Excessively High Discharge Gas Temperature at the Top of Compressor for IVX Series

No
Faulty thermistor
No
Install it correctly
No
Correctly charge refrigerant
Repair leaks of gas.
Correctly charge refrigerant.
Temperature (ºC)
Thermistor resistance characteristics
Thermistor for high discharge
gas temperature at the top of
compressor chamber (TH9)
8