Daikin FTX20K2V1B, Service Manual

Page: 70 / 114

Troubleshooting SiBE041525F
59 Service Diagnosis
4.8 Unspecified Voltage (Between Indoor Unit and Outdoor
Unit)
Error Code
UA
Method of Error
Detection
The supply power is detected for its requirements (pair type is different from multi type) by the
indoor / outdoor transmission signal.
Error Decision
Conditions
The pair type and multi type are interconnected.
Supposed
Causes

Wrong models interconnected

Wrong wiring of connecting wires
 Wrong indoor unit PCB or outdoor unit PCB mounted
 Defective indoor unit PCB

Defective outdoor unit PCB
Troubleshooting
(R20435)
Caution
NO
YES
YES
NO
Match the compatible models. OK?
Correct the connection.
Check the code numbers
(2P012345, for example) of the
indoor and outdoor unit PCB
with the Parts List.
If not matched, change for the
correct PCB.
Are the
connecting wires connected
property?
Check the combination of the
indoor and outdoor unit.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.