Hitachi RAS-(4-12)HNP(1)(E) - Excessively High Discharge Gas Temperature at the Top of Compressor

8 Troubleshooting
239
SMGB0087 rev.0 - 12/2013
8
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
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Limits of temperature
Outdoor capacity Tdc1 Tdc2 Tdh1 Tdh2
RAS-(2-6)H(V)N(P/C)1(E) 115 125 115 125
RAS-(8-12)HNP(E) 127 135 120 135
RAS-(8-12)HNC(E) 127 140 120 140