Hitachi RCUE40AG2 Service Manual page 131

Troubleshooting

Alarm code

[Alarm Stop Reason]
Thermistor for detection of water
side heat exchanger outlet
(backside=inside of heat exchanger)
temperature indicates abnormal
value.
Is Printed Circuit Board for
Relay (PCB ) connector
D
CN3 correctly connected?
Yes
Disconnect connector and
measure resistance. Is the
resistance correct?
Yes

NOTE:
The connector position differs from product model.
Product Model
RCUE 40 ~ 80 AG2
RHUE 40 ~ 80AG2
RCUE 80 ~ 400 AG2
RHUE 80 ~ 240 AG2
pag. 129
SMGB0003 rev.0 - 01/2007
Abnormality of Outlet Water Temperature
No
No
Abnormal
Thermistor
Code
Outlet water temperature Thermistor

(backside of cooler)
Outlet water temperature Thermistor

(backside of cooler)
Outlet water temperature Thermistor

(backside of cooler)
Outlet water temperature Thermistor

(backside of cooler)
Outlet water temperature Thermistor

(backside of cooler)
Outlet water temperature Thermistor

(backside of cooler)
Thermistor for Protection
[PCB Monitoring Position]
No. 1 Cycle: PCBD1 (I/O PCB) CN23Te2
No. 2 Cycle: PCBD2 (I/O PCB) CN23Te2
No. 3 Cycle: PCBD3 (I/O PCB) CN23Te2
No. 4 Cycle: PCBD4 (I/O PCB) CN23Te2
No. 5 Cycle: PCBD5 (I/O PCB) CN23Te2
Plug, Wiring Repair
Replace Thermistor
Replace printed circuit
board for Relay (PCB )
D
PCB Connector
PCB
D1
PCB
D1
PCB
D2
CN23
PCB
D3
PCB
D4
PCB
D5
5 5