Hitachi RCUE40AG2 Service Manual page 128

Troubleshooting
Alarm code

[Alarm Stop Reason]
Thermistor for inlet water temperature
indicates abnormal value.
Is Printed Circuit Board for
Control (PCB ) connector
C
CN3 correctly connected?
Yes
Disconnect connector and
measure resistance. Is the
resistance correct?
Yes

Alarm code


[Alarm Stop Reason]
Thermistor for outlet water
temperature indicates abnormal
value.
*"12-12": 1 cycle, "C1-12 ~ C5-12 ":
more than 2 cycle units
Is Printed Circuit Board for
Control (PCB ) connector
C
CN3 correctly connected?
Yes
Disconnect connector and
measure resistance. Is the
resistance correct?
Yes

NOTE:
The connector position differs from product model.
pag. 126
Inlet Chilled Water Thermistor Abnormality
No
No
Outlet Chilled Water Thermistor Abnormality
No
[ Stop by abnormality of chilled water outlet Themistor for No.1 cycle
]
[ ] Stop by abnormality of chilled water outlet Themistor for No. 2 cycle

No
SMGB0003 rev.0 - 01/2007
[PCB Monitoring Position]
PCB (CPU PCB) CN3
C1
[PCB Monitoring Position]
PCB (CPU PCB) CN4 (for inlet),
C
CN6(for No. 2 cycle)
Plug, Wiring Repair
Replace Thermistor
Replace printed circuit
board for CPU (PCB )
C
Plug, Wiring Repair
Replace Thermistor
Replace printed circuit
board for CPU (PCB )
C