Outdoor Unit - Daikin AT12BV1LS Pocket Manual

Si10-417

5.2 Outdoor Unit

5.2.1 Anti-icing Function
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Service Diagnosis
A5
Indoor unit icing, during cooling operation, is detected by
checking the temperatures sensed by the indoor unit
heat exchanger temperature thermistor and room
temperature thermistor that are located in a shut-down
room.
At another room (the indoor unit is normal), "UH" is
displayed on the remote controller.
In the cooling mode, the following conditions (A) and (B)
are kept together for 5 minutes.
(A) Indoor unit heat exchanger temperature ≤ –1°C
(B) Indoor unit heat exchanger temperature ≤ Room
temperature –10°C
If the indoor unit anti-icing function is activated four
times continuity, the system will be shut down.
(The 4-time counter will reset itself if any of the
following errors does not occur during the compressor
running time (total time): OL, radiation fin temperature
rise, insufficient gas, and compressor lock.)
<Total 60 minutes>
Wrong wiring or piping
Ev malfunctioning in each room
Short-circuit
Indoor unit heat exchanger temperature thermistor
abnormality
Room temperature thermistor abnormality
Troubleshooting
35