SiBE121135_A Troubleshooting for Outdoor Unit
Service Diagnosis 206
7.5 Anti-icing Control for Indoor Unit
Error Code A5
Outdoor Unit LED
Display
A j 1 i 2 h 3 i 4 i 5 h
∗ LED5 is equipped only on the 5-room model.
Method of Error
Detection
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
shut-down room.
Error Decision
Conditions
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
Supposed
Causes
Wrong wiring or piping
Defective outdoor electronic expansion valve
Short-circuited air
Defective indoor heat exchanger thermistor
Defective room temperature thermistor
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