Daikin VRV EMERION REYQ-AATJA Service Manual page 380

Troubleshooting by Error Code
Reference
CHECK 4 Refer to page 454.
373
A
The insulation
resistance of the relevant
compressor is low
(< 100 k:)
NO
Power OFF
The internal
wiring of the
compressor coil is
defective.
NO
Restart the
compressor, and
then check for the
operation. Does the
error recur?
Power ON
YES YES
Has the
compressor started
up at high differential
pressure (0.5 MPa
(72.5 psi) or
more)?
NO
CHECK 4
Is the power
Power OFF
transistor
normal?
YES
The error recurs at
Power ON
startup.
YES
Replace the inverter
Power OFF
PCB.
The error recurs
Power ON
at startup.
YES
YES
Replace the compressor.
YES
NO
Quit work.
Pressure equalization failure
may have occurred. Check for
the refrigerant system.
YES
Pressure equalization failure.
Check for the refrigerant
system.
NO
Replace the inverter PCB.
NO
Continue operation.
The error could have
resulted from instantaneous
power failure.
NO
Continue operation.
Replace the compressor.
This is not a failure of the
inverter PCB. Reinstall the
PCB.
SiUS372201EB
Part 6 Service Diagnosis