Hitachi RCUE40AG2 Service Manual page 135

Troubleshooting
Alarm code

[Alarm Stop Reason]
Thermistor for ambient temperature
indicates abnormal value.
Is connector CN5 on the
Printed Circuit Board for
CPU (PCBc) correctly
connected?
Yes
Pull out connector and
measure thermistor
resistance.
Is resistance correct?
Alarm code

[Alarm Stop Reason]
Communication between Ctrl PCB
and Ex.Valve PCB is not performed
correctly during 30 seconds.
Is connector CN13 on the
Printed Circuit Board for
CPU (PCBC) correctly
connected?
Is connector VCN13
on the Printed Circuit
Board for Ex. valve
control (PCBG) correctly
connected?
Yes
Check the Printed Circuit
Board for Ex.valve control
(PCBG)
Normal
Replace the Printed
Circuit Board for CPU
(PCBC)
pag. 133
SMGB0003 rev.0 - 01/2007
Ambient Temperature Thermistor
No
No
Yes
Error Communication between Ctrl. PCB and Ex. Valve PCB
No
Yes
No
Abnormal
Abnormality
[PCB Monitoring Position]
PCB (CPU PCB) CN5
C
[PCB Monitoring Position]
PCB (CPU PCB) ~PCB
C
Plug, Wiring Repair
Replace Thermistor
Replace Printed Circuit
Board for CPU (PCB )
C
(VD board) VCN13
G
Plug correctly and
repair wiring
Plug correctly and
repair wiring
Replace the Printed
Circuit Board for
Ex.Valve control
(PCBG)
5 5