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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
INSPECTIONAMBIENT AIR TEMPERATURE SENSOR CHECKThe ambient air temperature sensor should be checked in situ. Once the sensor is removed, it is rendered unserviceable. Measure the resistance between the sensor terminals under at least two temperatures.
Ambient Temperature Sensor Inspection)
