Daikin VRV RXYMQ-A Series Service Manual page 269

SiME332106E
Part 6 Service Diagnosis
Diagnosis Flowchart-1
UA-17
Error code Sub code
The number
of indoor units
connected to the same
system is less than 64.
NO
Diagnosis Flowchart-2
UA-18
Error code Sub code
Check if
the refrigerant
type of the outdoor
unit corresponds to that
of the indoor unit.
NO
Diagnosis Flowchart-3
UA-20
Error code Sub code
Multi connection?
YES
Was the
outdoor unit
main PCB replaced with a
spare PCB?
YES
Was proper setting of
spare PCB made?
YES
YES
YES
NO
A
NO NO
different model
of outdoor unit is
connected.
YES
NO
Troubleshooting by Error Code
Replace the outdoor unit main
PCB (A1P).
Excess indoor units are
connected.
Check for the connection to
connect the proper number of
indoor units.
Replace the outdoor unit main
PCB (A1P).
Match the refrigerant types of the
outdoor unit and the indoor unit.
Replace the outdoor unit main
PCB (A1P).
Replace the outdoor unit main
PCB (A1P).
Check for the model of outdoor
unit.
Make setting again, and then
reset the power supply.
Replace the spare PCB.
263