Check SiBE041134EB94 Service Diagnosis5. Check5.1 Thermistor Resistance CheckCheck No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance ofeach thermistor using a multimeter. When the room temperature thermistor is soldered on a PCB, remove the PCB from thecontrol PCB to measure the resistance. When the connector of indoor heat exchanger thermistor is soldered on a PCB, remove thethermistor and measure the resistance.The data is for reference purpose only.Thermistor temperature (°C) Resistance (kΩ)Room temperature thermistor Other thermistors–20 73.4 197.8–15 57.0 148.2–10 44.7 112.1–5 35.3 85.600 28.2 65.935 22.6 51.1410 18.3 39.9915 14.8 31.5220 12.1 25.0225 10.0 20.0030 8.2 16.1035 6.9 13.0440 5.8 10.6245 4.9 8.70750 4.1 7.176(R25°C = 10 kΩ, B = 3435 K) (R25°C = 20 kΩ, B = 3950 K)Room temperature thermistor(˚C)50250–15 0 15 30 45(kΩ)(R11952)Other thermistors(˚C)(kΩ)–15 0 15 30 4515010050Multimeter (R19559)Room temperaturethermistorMultimeterResistance range(R21542)
