Troubleshooting For Outdoor Unit; Anti-Icing Function - Daikin Super Multi NX FFQ25B8V1B Service Manual

SiBE121021_C

7. Troubleshooting for Outdoor Unit

7.1

Anti-icing Function

A5
Remote
Controller
Display
Outdoor Unit LED A
Display
Method of During cooling operation, indoor unit icing is detected by checking the temperatures sensed by
the indoor heat exchanger thermistor and room temperature thermistor that are located in a
Malfunction
shut-down room.
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Service Diagnosis
j i h i i
1 2 3 4
In cooling operation, the both conditions (A) and (B) are met for 5 minutes.
(A) Room temperature – Indoor heat exchanger temperature ≥ 10°C
(B) Indoor heat exchanger temperature ≤ –1°C
If the error repeats 4 times, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Wrong wiring or piping
Defective electronic expansion valve
Short-circuited air
Defective indoor heat exchanger thermistor
Defective room temperature thermistor
h
5

Troubleshooting for Outdoor Unit

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