SiBE121123_A
Troubleshooting for Outdoor Unit
Service Diagnosis
186
7.5
Anti-icing Control for Indoor Unit
Error Code
A5
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, both the condition (A) and (B) are met for 5 minutes.
(A) Stop room thermistor 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: 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
