Troubleshooting SiUS091133
105 Service Diagnosis
Refrigerant shortage detection III: (09/12 class only)
When the difference of the temperature is smaller than L, it is regarded as refrigerant shortage.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor
Closed stop valve
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Defective electronic expansion valve
L
Cooling
room thermistor temperature – indoor heat exchanger temperature 4.0°C (7.2°F)
outdoor heat exchanger temperature – outdoor temperature 4.0°C (7.2°F)
Heating
indoor heat exchanger temperature – room thermistor temperature 3.0°C (5.4°F)
outdoor temperature – outdoor heat exchanger temperature 3.0°C (5.4°F)
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