Carrier DHMSHAQ09XA1 Service Manual page 33

Main Parts Check
Temperature Sensor Checking
Disconnect the temperature sensor from the PCB, measure the resistance value with a tester.
Fig. 34 – Tester
Temperature sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor discharge temp.(T5) sensor.
Measure the resistance value of each winding by using the multi−meter.
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