Troubleshooting SiBE12-908
131 Service Diagnosis
2.15 Freeze-up Protection 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 freeze-up protection in other rooms
Operation halt due to unspecified voltage between indoor and outdoor units
Supposed
Causes
Operation halt due to the freeze-up protection 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.
Supply voltage as
specified?
Error-displaying air-
conditioner running?
The freeze-up protection is
activated in other rooms.
Refer to
A5
.
YES
NO
NO
YES
Check the model number.
Normal?
Check the combination of all the
models being connected.
YES
NO
Correct.
Reconnect.
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