Alarm For Operation Error; Activation Of Differential Pressure Control - Hitachi RCUE40AG1-400AG1 Service Manual

!
[] Alarm for Operation Error
Performed incorrect operation.
Is local operation?
Yes (Local)
Is optional wiring connected?
No
Is it changed over to
remote side during local
operation?
No
[] ~ [] Activation of Differential Pressure Control
!
This alarm code is indicated when the pressure difference between discharge and suction pressure is less than 0.3 Mpa
during 3 minutes.
No (Remote)
Is 220-240V between PIN1-PIN3
of connector PCN16 on the printed
circuit board for CPU (PCB
Yes
Yes
(Normal
Running)
Is connector CN28Pd
and CN29Ps on the
Printed Circuit Board for
Relay (PCB ) correctly
D
connected?
Yes
Yes (Normal
Is changeover to
local side during remote
operation?
No
No
)?
C
Yes
Yes (Normal
Is the signal transmitted
from option device?
No
No
Check Refrigerant oil strainer clogging
Check Refrigerant oil Quantity
Solenoid Valve for Compressor Malfunction
Compressor slide valve Malfunction
TROUBLESHOOTING
It is incorrect that
operation changeover
Running)
to local side during
remote operation.
Do not perform it.
Wiring Check between
remote control switch
and printed circuit board
Check printed circuit
board for CPU (PCB
It is incorrect that
Running)
remote operation signal
is transmitted from
option device during
local operation.
Do not perform it.
Wiring Check between
external device
and printing board
It is incorrect operation
that changeover to
Remote Side during
Local Operation.
Do not perform it.
Check printed circuit
board for display (PCB
Check printed circuit
board for operation (PCB
Check printed circuit
board for CPU (PCB
Plug correctly
and repair wiring
1
/19
.
)
C
)
A
)
B
)
C