Hitachi UTOPIA RAS-4HVRP2E Service Manual page 271

10 Troubleshooting
Troubleshooting procedure
08
Alarm code
• The alarm code is flashed on the 7-segment display of the outdoor unit.
• The alarm code is displayed on the wired controller of the indoor unit.
This alarm code is displayed when the discharge temperature is too high during cooling/heating operation.
Thermistor
Resistance R
269 SMGB0136 rev.0 - 07/2021
Excessively High Discharge Gas Temperature
No
Is thermistor THM9
normal?
Yes
No
Is thermistor THM9
installed correctly?
Yes
Yes
Is gas leaking?
No
Recharge refrigerant
T
[kΩ]
Temperature T (°C)
Thermistor Characteristics
Failure of Thermistor
Install it correctly
Repair gas leakage
10