Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 933

2) Procedure for checking the outdoor unit irrespective of indoor/outdoor transmission
Turn off the outdoor unit power supply
Set 45 in outdoor unit No.
Turn ON the outdoor unit PCB (SW
Turn ON the outdoor unit power supply
Open the 63H
1
Is the 52C
turned ON?
YES
Can the compressor
operate at 35Hz?
NO
Turn OFF the outdoor unit power supply
Return outdoor unit No. to the installation state.
1
(Continued to the previous page)
Note (1) When using this procedure, the indoor unit enters a transmission error state. In the indoor unit the expansion valve
may be closed or the fan may stop.
After the compressor is operated, stop it at once.
Otherwise, it will cause a failure to the compressor.
(Or pull out the connector CnA
)
3-8
(When connecting the CnA
(Pull out Faston No.T24 on the PCB)
NO
Does a voltage
Appear at the 52C coil
Defective outdoor unit PCB
YES
Defective outdoor unit PCB or
(1)
indoor unit PCB.
on the outdoor unit PCB)
2
on the outdoor unit PCB)
2
YES
Defective 52C
NO
FDC-HKX
931