Hitachi Utopia PAS-3HVRG, Руководство по обслуживанию

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TROUBLESHOOTING
1-35
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the thermistor is short-circuited (less than 1 k
Ω
) or cut (greater
than 6 M
Ω
) during the cooling or heating operation.
Alarm
Code
Abnormality of Thermistor for Discharge Gas Temperature
(Compressor Thermistor)
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Top of
Compressor
Thermistor
Check resistance.
Replace thermistor
if faulty.
Fault
Check wiring to PCB1.
Repair wiring and
connections.
Incorrect Connection
Replace PCB1 and
check operation.
Replace PCB1 if faulty. Faulty PCB1
Yes
Connect it.
No
Faulty PCB
Is the thermistor connected
to THM9 of PCB?
Yes
Faulty Thermistor
No
Is resistance of THM9
between 1k
Ω
and 6k
Ω
?
Temperature (
o
C) Resistance (k
Ω
) Temperature (
o
C) Resistance (k
Ω
)
0 640.44 65 41.79
5 500.66 70 35.11
10 394.16 75 29.61
15 312.41 80 25.07
20 249.20 85 21.31
25 200.00 90 18.17
30 161.45 95 15.55
35 131.06 100 13.35
40 106.96 105 11.50
45 87.74 110 9.93
50 72.32 115 8.60
55 59.97 120 7.47
60 49.96 125 6.51
The resistance value have fudge factor (+10%).