Daikin VRV RXYQ72-384XAYCA Service Manual page 349

SiUS342004EB
Note(s)
1. Refer to page 347.
Part 6 Service Diagnosis
Diagnosis Flowchart-1
UA-17
Error code Sub code
The
number of indoor
YES
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
Is the
NO
model of indoor
unit FXTQ-TA or
FXTQ-TB?
YES
Incorrect
electric heater
YES
capacity setting
troubleshooting ( 1)
checked?
NO
YES
Troubleshooting by Error Code
Replace the outdoor unit main
PCB (A1P).
Replace the outdoor unit main
PCB (A1P).
Refer to Incorrect electric heater
capacity setting troubleshooting.
( 1)
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.
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