Hitachi UTOPIA RAS-4HVRP2E - Page 248

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
246
Alarm code
08
Excessively high discharge gas temperature at the top of compressor
• The alarm appears during cooling operation when the compressor-top thermistor temperature remains at Tdc1 or
above for 10 minutes, or at Tdc2 or above for 5 seconds.
• The alarm appears during heating operation when the compressor-top thermistor temperature remains at Tdh1 or
above for 10 minutes, or at Tdh2 or above for 5 seconds.
7,47
5,76
9.93
13.4
35.1
72.3
18.7
25.1
49.9
Thermistor resistance characteristics
Temperature (ºC)
Thermistorresistance(kΩ)
Compressor-top thermistor
(THM9)
Compressor-top thermistor
(THM9)
Is the thermistor THM9 on top of
compressor normal?
Faulty thermistor
No
Yes
Is the thermistor THM9 installed
correctly on the compressor?
Install it correctly
No
Yes
Correctly charge
refrigerant
Yes
Is gas leaking?
Repair leaks of gas.
Correctly charge
refrigerant.
No

Limits of temperature
Outdoor capacity Tdc1 Tdc2 Tdh1 Tdh2
RAS-3HVRC2 115 125 115 125