Hitachi RAS-(4-12)HRNM(2)(E) - Excessively High Discharge Gas Temperature at the Top of Compressor for IVX Series

8 Troubleshooting
233
SMGB0064 rev.0 - 08/2011
8
Alarm code
08
Excessively High Discharge Gas Temperature at the Top of Compressor 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 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?
Faulty thermistor
No
Thermistor for high discharge
gas temperature at the top of
compressor chamber (TH9)
Yes
Is the thermistor installed
correctly on the compressor?
Install it correctly
No
Yes
Is gas leaking?
Correctly charge refrigerant
No
Yes
Repair leaks of gas.
Correctly charge refrigerant.
Thermistor
resistance (kΩ)
Temperature (ºC)
Thermistor resistance characteristics