Daikin REYQ-TA Series Service Manual page 278

Troubleshooting by Error Code
∗
Note:
265
Diagnosis Flowchart-1
UA-17
Error code
The
number of indoor
units connected to the
same system is not
more than 64.
NO
1. Refer to page 268.
Diagnosis Flowchart-2
UA-18
Error code
Check if the
refrigerant type of
the outdoor unit
corresponds to that
of the indoor
unit.
NO
Sub code
Is the
YES
model of indoor
unit FXTQ?
YES
Incorrect
electric heater
capacity setting
troubleshooting (∗1)
checked?
NO
Sub code
YES
NO
Replace the outdoor unit main
PCB (A1P).
YES
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.
Service Diagnosis
SiUS371614E