Daikin VRV EMERION REYQ-AATJA Service Manual page 444

Troubleshooting by Error Code
437
Diagnosis Flowchart-9
UA-31
Error code Sub code
Is the multi
NO
combination of
outdoor units
proper?
YES
Was the
NO
outdoor unit PCB
replaced with a spare
PCB?
YES YES
Is the
NO
procurement of the
spare PCB proper?
YES YES
NO
Is the setting of the
spare PCB proper?
YES
Diagnosis Flowchart-10
UA-53
Error code Sub code
Is the
DIP switch of the NO
Multi Branch Selector unit
correct?
YES
Is the
indoor unit of the
NO
Multi Branch Selector unit
connected
correctly?
YES
Is the
power supply of
NO
the indoor unit of the
Multi Branch Selector
unit ON?
YES
SiUS372201EB
Correct the multi combination of
outdoor units.
Replace the outdoor unit main PCB
(A1P).
Procure a proper spare PCB.
Make setting again, and then reset
the power supply.
Replace the outdoor unit main PCB
(A1P).
After turning OFF the power supply
of the Multi Branch Selector unit,
correct the DIP switch settings.
Turn ON the power supply of the
Multi Branch Selector unit, and
press the RETURN (BS3) button
on the outdoor unit main PCB (A1P)
for 5 seconds or more.
Correct the connection.
Turn ON the power supply of the
indoor unit.
Press the RETURN (BS3) button
of the outdoor unit main PCB
(A1P) for 5 seconds or more. If
the error is not cleared after 30
minutes have elapsed, replace
the Multi Branch Selector unit PCB.
Part 6 Service Diagnosis