Hitachi RCUE40AG2 Service Manual page 126

Troubleshooting

Alarm code


[Alarm Stop Reason]
- Water outlet temperature is above 59°C
during compressor operation. (only heating
operation)
- PCB PCN12 wiring is broken.
C
*"14-14" : 1 cycle unit
"C1-14 ~ C5-14 ": more than 2 cycle units
Is connectors CN3 on the
Printed Circuit Board for
Relay (PCBD)correctly
connected?
Yes
Pull out connector and
measure thermistor
resistance
Is resistance correct?
Yes
Yes
Check printed circuit
board for Relay
(PCB )
D

NOTE:
The below table shows the relation between Thermistor and alarm indication as well as
connecting Printed Circuit Board (PCB).
Abnormal
Product Model
Code
RCUE 40 ~ 80 AG2

RHUE 40 ~ 80AG2


RCUE 80 ~ 400 AG2

RHUE 80 ~ 240 AG2


pag. 124
SMGB0003 rev.0 - 01/2007
Activation of Water Overheating Protection Control
[PCB Monitoring Position]
No
No
Thermistor
Outlet water outlet temperature Thermistor 1
Outlet water outlet temperature Thermistor 1
Outlet water outlet temperature Thermistor 1
Outlet water outlet temperature Thermistor 1
Outlet water outlet temperature Thermistor 1
Outlet water outlet temperature Thermistor 1
PCB (CPU PCB):
C
- CN4 (for No.1 cycle outlet control)
- CN6 (for No. 2cycle outlet control)
PCB (CPU PCB) PCN12
C
Plug correctly and
repair wiring
Replace Thermistor
Check water fl ow rate (Check the
temperature of Inlet and Outlet)
Check pump reverse rotation
Check water strainer clogging
Check air mixing
Check Chilled water thermostat setting value
(It shall be within the working range)
PCB
PCB
C1
PCB
C1
PCB
C1
PCB
C1
PCB
C2
PCB
C2
Connector
CN4
CN4
CN6
CN7
CN4
CN6