Service Manual

SiUS121502E Troubleshooting for Outdoor Unit
Service Diagnosis 141
7.4 Unspecified Voltage (Between Indoor Unit and Outdoor
Unit) / Anti-icing Control in Other Rooms
Error Code
UA, UH
Outdoor Unit LED
Display
A
j
1
h
2
h
3
h
4
h
5
h
Method of Error
Detection
A wrong connection is detected by checking the combination of indoor and outdoor units on the
microcomputer.
Error Decision
Conditions

Anti-icing control in other rooms

Unspecified internal and/or external voltages

Mismatching of indoor and outdoor units
Supposed
Causes

Anti-icing function in other rooms

Power supply voltage is not as specified.

Wrong models interconnected

Wrong indoor unit PCB or outdoor unit PCB mounted
Troubleshooting
Note: Refer to Anti-icing control for indoor unit on page 142 for detail.
(R21922)
Caution
NO
YES
NO
YES
NO
YES
Check the model combination.
Error displayed while
operating?
Power
supply voltage as
specified?
Matched compatibly?
The anti-icing function is
activated in other rooms.
Refer to A5.
Correct the power supply
voltage.
Match the compatible models.
Check the combination of all
connected models.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.