Troubleshooting
5.9
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
Malfunction
indoor heat exchanger thermistor and the room temperature thermistor that are located in a shut-
down room.
Detection
In cooling operation, the both conditions (A) and (B) are met for 5 minutes.
Malfunction
Decision
Conditions
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
Supposed
Defective electronic expansion valve
Causes
Short-circuited air
Defective indoor heat exchanger thermistor
Defective room temperature thermistor
113
1
2
3
4
(A) Room thermistor temperature – Indoor heat exchanger temperature ≥ 10°C (18°F)
(B) Indoor heat exchanger temperature ≤ –1°C (30°F)
SiUS12-928_A
Service Diagnosis