Troubleshooting for Outdoor Unit SiUS12-928_B
163 Service Diagnosis
6.5 Anti-icing Function
Remote
Controller
Display
A5
Outdoor Unit LED
Display
A 5 1 4 2 3 3 4 4 4
Method of
Malfunction
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.
Malfunction
Decision
Conditions
In cooling operation, the both conditions (A) and (B) are met for 5 minutes.
(A) Room temperature – Indoor heat exchanger temperature 18°F (10°C)
(B) Indoor heat exchanger temperature 30.2°F (–1°C)
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
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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