Troubleshooting SiMT041311E135 Service Diagnosis2.10 Freeze-up Protection Control / Heating Peak-cut ControlError Code A5Method of ErrorDetection Freeze-up protection controlDuring cooling operation, the freeze-up protection control (operation halt) is activatedaccording to the temperature detected by the indoor heat exchanger thermistor. Heating peak-cut controlDuring heating operation, the temperature detected by the indoor heat exchanger thermistoris used for the heating peak-cut control (operation halt, outdoor fan stop, etc.)Error DecisionConditions Freeze-up protection controlDuring cooling operation, the indoor heat exchanger temperature is below 0°C. Heating peak-cut controlDuring heating operation, the indoor heat exchanger temperature is above 54.5°CSupposedCauses Short-circuited air Clogged air filter of the indoor unit Dust accumulation on the indoor heat exchanger Defective indoor heat exchanger thermistor Defective indoor unit PCB (A1P)
