Anti-Icing Function - Daikin 3MKS50E3V1B Service Manual

Troubleshooting for Outdoor Unit
7.5

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
Malfunction the indoor heat exchanger thermistor and room temperature thermistor that are located in a
shut-down room.
Detection
Malfunction
Decision
Conditions
Supposed
Causes
302
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, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Wrong wiring or piping
Defective outdoor electronic expansion valve
Short-circuited air
Defective indoor heat exchanger thermistor
Defective room temperature thermistor
h
5
SiBE121135
Service Diagnosis