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Troubleshooting
SiBE12-933_A
208
Service Diagnosis
4.23 Anti-icing Function in Other Rooms / Unspecified
Voltage (between Indoor and Outdoor Units)
Remote
Controller
Display
UA
,
UH
Method of
Malfunction
Detection
A wrong connection is detected by checking the combination of indoor and outdoor units on the
microcomputer.
Malfunction
Decision
Conditions
Operation halt due to the anti-icing function in other rooms
Operation halt due to unspecified voltage between indoor and outdoor units
Supposed
Causes
Operation halt due to the anti-icing function in other rooms
Wrong connections at the indoor unit
PCB wrongly connected
Troubleshooting
(R7151)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check the model number.
Error-displaying air
conditioner running?
NO
NO
NO
YES
YES
YES
Supply voltage as
specified?
Normal?
Check the combination of all the
models being connected.
The anti-icing function is
activated in other rooms.
Refer to A5.
Correct.
Reconnect.