Si12-411A Troubleshooting
Service Diagnosis 205
5.25 Anti-icing Function in Other Rooms / Unspecified
Voltage (between Indoor and Outdoor Units)
Remote
Controller
Display
UA, UH
Outdoor Unit LED
Display
A
5
1
1
2
1
3
1
4
1
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 internal and/or external voltages
Operation halt due to mismatching of 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
Check the model name.
The freeze protection
function is activated in
other rooms. Refer to A5.
Correct.
Reconnect.
(R3066)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Error-displaying
air-conditioner running?
NO
YES
Normal?
Supply voltage
as specified?
NO
YES
NO
YES
Check the combination of all the
models being connected.
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