Hitachi RCUE40AG2 Service Manual page 121

Troubleshooting

Alarm code

[Alarm Stop Reason]
- Suction Gas Temperature (Ts) is lower than –2°C
during 10 seconds. (only cooling operation)
*Alarm stop: 3 retries during 30 minutes.
(Compressor stop, automatic restart in 3 minutes)
[Retry Code]
No. 1 Cycle: C1-P6
No. 2 Cycle: C2-P6
No. 3 Cycle: C3-P6
No. 4 Cycle: C4-P6
No. 5 Cycle: C5-P6
Is the wiring of connector
in the Printed Circuit Board
for Relay (PCB ) correct?
D
Yes
Pull out connector and
measure thermistor
resistance. Is resistance
correct?
Yes
Yes
Check Printed Circuit
Board for Relay
(PCB )
D
pag. 119
SMGB0003 rev.0 - 01/2007
Low Pressure Protection by Suction Gas Thermistor (Ts)
No
No
[PCB Monitoring Position]
No. 1 Cycle: PCB
D1
No. 2 Cycle: PCB
D2
No. 3 Cycle: PCB
D3
No. 4 Cycle: PCB
D4
No. 5 Cycle: PCB
D5
Plug correctly and
repair wiring
Replace thermistor
Check the water fl ow rate.(Check
temperature of inlet and outlet.)
Clogging of water strainer
Pump reverse rotating check
Check the air mixing
Check chilled water thermostat setting value
(Within the working range)
Shortage of refrigerant / Gas leakage
Clogging of low pressure pipe
Clogging of expansion valve
Malfunction of check valve
Malfunction of expansion valve
(I/O PCB) CN25Ts
(I/O PCB) CN25Ts
(I/O PCB) CN25Ts
(I/O PCB) CN25Ts
(I/O PCB) CN25Ts
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