Hitachi RCUE40AG2 Service Manual page 116

Troubleshooting

Alarm code

[Alarm Stop Reason]
-Suction pressure (Ps) is less than
0.333MPa during 90 seconds. (Electronic
control, air-cooled type)
-Suction pressure (Ps) is less than
0.314MPa during 90 seconds. (Electronic
control, air-cooled heat pump type
(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 connector CN 29Ps
on the Printed Circuit
Board for Relay (PCB )
D
correctly connected?
No
Wiring Check
pag. 114
SMGB0003 rev.0 - 01/2007
Activation of suction pressure protection control
[PCB Monitoring Position]
No. 1 Cycle: PCB
No. 2 Cycle: PCB
No. 3 Cycle: PCB
No. 4 Cycle: PCB
No. 5 Cycle: PCB
Yes
(I/O PCB) CN29Ps
D1
(I/O PCB) CN29Ps
D2
(I/O PCB) CN29Ps
D3
(I/O PCB) CN29Ps
D4
(I/O PCB) CN29Ps
D5
Shortage of Refrigerant / Gas Leakager
Clogging of expansion valve
Clogging of low pressure side piping
Stop Valve malfunction
Shortage of Water
Pump reverse rotation
Air mixed
Clogging of Strainer
Too much water in refrigerant
Water stain in water side heat exchanger