Service Manual

Troubleshooting SiUS041638E
69 Service Diagnosis
4.9 Mismatching of Indoor Unit and Outdoor Unit
Error Code
UA
Method of Error
Detection
Detection from the signal transmission signal between indoor/outdoor units.
Error Decision
Conditions
Improper combination of indoor and outdoor units.
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
(R24632)
Caution
NO
YES
YES
NO
Correct the combination of
indoor/outdoor units.
OK?
Connect the wirings correctly.
Replace the indoor unit
PCB (control PCB) or
outdoor unit PCB (main PCB).
Are the
connecting wires connected
properly?
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.