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Small cylindrical HVAC temperature sensor with metal probe and wire leads

Appliance Factory Parts

Appliance Factory Parts 3900007301 Temp Sensor appliance part

SKU CH-GZAP-YKEV3

A temperature sensor for Comfort-Aire HVAC units including models A-VFH18DA-1, A-VFH24TA-1, A-VFH30QA-1 and A-VFH18DB-1

  • Selling UnitEach
  • TypeHVAC Parts
  • Restores accurate temperature control
  • compatible with A-VFH18DA-1 and A-VFH18DB-1 models
  • fits A-VFH24TA-1 24K BTU units
  • supports A-VFH30QA-1 30K BTU systems
  • genuine HVAC replacement part number 3900007301

Compatible Comfort-Aire Models

This temperature sensor is a direct replacement part for four Comfort-Aire units. It fits the A-VFH18DA-1, A-VFH24TA-1, A-VFH30QA-1 and A-VFH18DB-1 models. HVAC technicians and homeowners use it to restore accurate temperature regulation in these specific air handlers.

HVAC Thermal Regulation Component

As an HVAC temperature sensor, this part monitors ambient conditions and sends data to the system control board. Proper function ensures the unit cycles correctly to maintain setpoints. A failed sensor can cause erratic cooling, heating or continuous operation without visible damage to other components.

Replaces Faulty OEM Sensors

This part replaces an original sensor that has drifted out of calibration or failed electrically. The jump is worth it when the system shows incorrect room temperatures, short-cycles or fails to reach the target temperature. It is not for buyers needing a universal probe, a different connector type or a sensor for non-listed brands.

Highlights

  • Restores accurate temperature control
  • compatible with A-VFH18DA-1 and A-VFH18DB-1 models
  • fits A-VFH24TA-1 24K BTU units
  • supports A-VFH30QA-1 30K BTU systems
  • genuine HVAC replacement part number 3900007301

Specifications

BrandAppliance Factory Parts
Selling UnitEach
Part NumberCMF3900007301
TypeHVAC Parts

Questions about this item

How do I install the 3900007301 temp sensor in my A-VFH18DA-1 unit, and what step is often missed?

Disconnect power, locate the sensor in the evaporator compartment, remove the old probe and clip, insert the new sensor fully into the mounting bracket, and reconnect the wiring harness — the step most often missed is seating the probe tip completely into the bracket so it reads coil temperature accurately.

What maintenance or replacement will the CMF3900007301 sensor need over time?

The sensor itself requires no scheduled maintenance; plan to replace it only if the control board reports an open or shorted sensor code, or if temperature readings drift enough to affect heating or cooling cycles.

What limit appears first on the 3900007301 sensor during sustained heating or cooling operation?

The sensor's operating temperature range is the first limit; continuous exposure beyond the range specified for the A-VFH18DA-1, A-VFH24TA-1, A-VFH30QA-1 or A-VFH18DB-1 models can cause resistance drift and trigger a fault code.

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