Hitachi RCUE40AG2 Service Manual page 114

Troubleshooting

Alarm code

[Alarm Stop Reason]
High pressure (Pd) is increased
to more than 2.74MPa, and high
pressure switch (63H) is activated.
Is alarm activated just
after running?
Yes
Is alarm activated in 3
minutes after running
operation?
Yes
Is 220-240V the voltage
between connector
PCN203 PIN1 and
connector PCN203 PIN3
on the Printed Circuit on the Printed Circuit
Board for Relay (PCBD)? Board for Relay (PCBD)?
Yes
Check Printed Circuit
Board for Relay
(PCBD)
pag. 112
Activation of High Pressure Switch (63H)
Yes
(activated
immediately) immediately)
Is high pressure switch
(63H) reset?
Is 220-240V the voltage
between connector
PCN203 PIN1 and
connector PCN203 PIN3
on the Printed Circuit
Board for Relay (PCBD)? Board for Relay (PCBD)?
Is high pressure switch
(63H) activated?
Is 220-240V the voltage
between connector
PCN203 PIN1 and
connector PCN203 PIN3
on the Printed Circuit
Board for Relay (PCBD)? Board for Relay (PCBD)?
No
Wiring Check
SMGB0003 rev.0 - 01/2007
[PCB Monitoring Position]
No. 1 Cycle: PCB (I/O PCB )PCN203
D1
No. 2 Cycle: PCB (I/O PCB )PCN203
D2
No. 3 Cycle: PCB (I/O PCB )PCN203
D3
No. 4 Cycle: PCB
D4
No. 5 Cycle: PCB
D5
No
Reset the switch
Yes
Yes
Check Printed Circuit
Board for Relay
Wiring check
No
(disconnecting, wiring
Yes (PCB is
normal)
<COOLING>
Clogging of air side heat exchanger
Check of high pressure
No
Cycle check
<HEATING>
Shortage of Water
Pump reverse rotation
Air mixed
Expansion valve malfunction
Water stain in water side heat
exchanger
Clogging of Water Strainer
No
(disconnecting, wiring
Check Printed Circuit
Yes
(I/O PCB )PCN203
(I/O PCB )PCN203
(PCBD)
error)
Wiring check
error)
Board for Relay
(PCBD)