Daikin AT12BV1LS Pocket Manual page 149

Troubleshooting
5.3.13 Anti-icing Function in Other Rooms /
Unspecified Voltage (between Indoor and
Outdoor Units)
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Trouble
shooting
148
UA,UH
A wrong connection is detected by checking the
combination of indoor and outdoor units on the
microcomputer.
Operation halt due to the anti-icing function in other
rooms
Operation halt due to unspecified voltage between
indoor and outdoor units
Operation halt due to the anti-icing function in other
rooms
Wrong connections at the indoor unit
PCB wrongly connected
Be sure to turn off power switch before connect or
disconnect connector, or parts damage may be occurred.
Caution
Error-displaying
air-conditioner
running?
YES
Supply voltage
as specified?
YES
Check the model number.
Normal?
YES
Check the combination of all
the models being connected.
NO
The anti-icing function
is activated in other
rooms. Refer to A5.
NO
Correct.
NO
Reconnect.
Service Diagnosis
Si10-417
(R3045)