Troubleshooting for Outdoor Unit SiBE121135_A
205 Service Diagnosis
7.4 Unspecified Voltage (between Indoor Unit and Outdoor
Unit) / Anti-icing Function in Other Rooms
Error Code UA, UH
Outdoor Unit LED
Display
A j 1 h 2 h 3 h 4 h 5 h
∗ LED5 is equipped only on the 5-room model.
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 function 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 206 for detail.
(R18424)
Caution
NO
YES
NO
YES
NO
YES
Check the model combination.
Check the combination of all the
models being connected.
The anti-icing function is
activated in other rooms.
Refer to A5.
Correct the power supply
voltage.
Match the compatible models.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Error displayed while
operating?
Power supply voltage
as specified?
Matched compatibly?
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