Troubleshooting for RA Indoor Unit SiEBE18-526258 Troubleshooting4.2 Freeze-up Protection Control or High Pressure ControlRemoteControllerDisplayA5Method ofMalfunctionDetection High pressure control (heat pump model only)During heating operations, the temperature detected by the indoor heat exchangerthermistor is used for the high pressure control (stop, outdoor fan stop, etc.) The freeze-up protection control (operation halt) is activated during cooling operationaccording to the temperature detected by the indoor unit heat exchanger thermistor.MalfunctionDecisionConditions High pressure controlDuring heating operations, the temperature detected by the indoor heat exchangerthermistor is above 65°C Freeze-up protectionWhen the indoor unit heat exchanger temperature is below 0°C during cooling operation.SupposedCauses Operation halt due to clogged air filter of the indoor unit. Operation halt due to dust accumulation on the indoor unit heat exchanger. Operation halt due to short-circuit. Detection error due to faulty indoor unit heat exchanger thermistor. Detection error due to faulty indoor unit PCB.
