Carrier 38MARB - Main Parts Check

38MARB: Service Manual
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Main Parts Check
1. Temperature sensor checking
Disconnect the temperature sensor from PCB, measure the resistance value with a tester.
Fig. 42 —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.