SiBE121021_C Troubleshooting for Outdoor Unit
Service Diagnosis 361
7.19 Anti-icing Function in Other Rooms / Unspecified
Voltage (between Indoor and Outdoor Units)
Remote
Controller
Display
UA, UH
Outdoor Unit LED
Display
A
j
1
h
2
h
3
h
4
h
5
h
Method of
Malfunction
Detection
A wrong connection is detected by checking the combination of indoor and outdoor units on the
microcomputer.
Malfunction
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
Wrong models interconnected
Wrong indoor unit PCB or outdoor unit PCB mounted
Troubleshooting
Note: Refer to “Anti-icing function” on page 333 for detail.
(R7151)
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.
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?
Supply voltage as
specified?
Matched compatibly?
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