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Troubleshooting for Outdoor Unit
SiBE12-816_D
235
Service Diagnosis
7. Troubleshooting for Outdoor Unit
7.1
Anti-icing Control for Indoor Unit
Remote
Controller
Display
A5
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, 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: Continuous run for about 60 minutes without any other error
Supposed
Causes
Wrong wiring or piping
Defective electronic expansion valve
Short-circuited air
Defective indoor heat exchanger thermistor
Defective room temperature thermistor