Daikin AT12BV1LS Pocket Manual page 147

Troubleshooting
5.3.11 Unspecified Voltage (between Indoor and
Outdoor Units)
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Trouble
shooting
146
UA
The supply power is detected for its requirements
(different from separate type and multi type) by the
indoor / outdoor transmission signal.
The separate type and multi type are interconnected.
Wrong models interconnected
Wrong indoor unit PCB mounted
Indoor unit PCB defective
Wrong outdoor unit PCB mounted or defective
Be sure to turn off power switch before connect or
Caution disconnect connector, or parts damage may be occurred.
Check the indoor and outdoor
unit model numbers.
Indoor unit
and outdoor unit
matched?
YES
Check the code numbers
(2P01234, for example) of the
indoor and outdoor unit PC
boards with the Parts List.
Matched compatibly?
YES
NO
Match the compatible
models.
NO
Change for the
specified PC board (1)
or (2).
Replace the indoor
unit PC board (1) (or
the outdoor unit PC
board).
Service Diagnosis
Si10-417
(Q0347)