Hitachi RCUE40AG2 Service Manual page 122

Troubleshooting
Alarm code

[Alarm Stop Reason]
Pump operation feedback signal (terminals 1-2) is
OFF during pump Interlock (CMP) ON (terminals
3-4)
*It is available once feedback signal confi rmed.
[PCB Monitoring Position]
PCB (CPU PCB) PCN24
c
Is 220-240V the voltage
between connector PCN4
PIN1 and connector PCN4
PIN3 on the Printed Circuit
Board for CPU (PCBc)?
Yes
Printed Circuit Board
for CPU (PCBc) check
pag. 120
No Feedback Signal from Water Pump
No (Printed
Circuit Board
is normal) is normal)
Is thermal relay for pump
SMGB0003 rev.0 - 01/2007

ATTENTION:
During pump operation (during unit stop),
Alarm is reset by
1. Feedback signal reconfi rm
2. Pump stop
3. Unit operation
It is not reset by stop operation.
Yes
(TRP) activated?
No
Check pump lock
Check thermal relay
for pump
Check wiring around
pump and thermal
relay for pump