Anti-Icing Control For Indoor Unit - Daikin Super multi NX E Series Service Manual

SiBE121135_A
7.5

Anti-icing Control for Indoor Unit

A5
Error Code
Outdoor Unit LED
A
∗ LED5 is equipped only on the 5-room model.
Display
Method of Error
During cooling operation, indoor unit icing is detected by checking the temperatures sensed by
Detection the indoor heat exchanger thermistor and room temperature thermistor that are located in a
shut-down room.
Error 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, the system is shut down.
Reset condition: 3-minute standby is over and the indoor heat exchanger temperature is
above 0°C
Wrong wiring or piping
Defective outdoor electronic expansion valve
Short-circuited air
Defective indoor heat exchanger thermistor
Defective room temperature thermistor
h
5
Troubleshooting for Outdoor Unit
206