MRCOOL Mini Split Thermistor (Temp Sensor) for A-09-HP-WMAH-230B Air Handler | OEM Replacement

Fix inaccurate temperature readings, restore proper cooling and heating, and eliminate common mini split issues with this genuine MRCOOL thermistor (temperature sensor).

This OEM thermistor is designed for use in select MRCOOL wall-mounted mini split air handlers and plays a critical role in system performance. It continuously monitors temperature and sends data to the control board, allowing your system to adjust compressor operation, fan speed, and defrost cycles accurately.

If your mini split is not maintaining temperature, short cycling, freezing up, or displaying error codes, a faulty thermistor is one of the most common causes.

Common Problems This Thermistor Fixes:

• Mini split not cooling properly or blowing warm air
• Mini split not heating correctly
• Incorrect room temperature readings
• Evaporator coil freezing or icing up
• System short cycling (turning on and off repeatedly)
• Error codes related to temperature sensors
• Fan not operating as expected

Key Features:

• Genuine MRCOOL OEM replacement part
• Designed for accurate temperature sensing and system control
• Direct replacement for factory-installed thermistor
• Helps restore efficiency and proper operation
• Plug-and-play connection (model dependent)

Compatible Model (Guaranteed Fit):

• A-09-HP-WMAH-2308 Wall-Mounted Mini Split Air Handler

Part Number: 11201007003447

⚠️ Important Fitment Notice:

This thermistor is guaranteed to fit the model listed above. It may be compatible with other MRCOOL mini split systems or similar brands, but compatibility is not guaranteed unless specifically listed.

If your model is not listed, contact us before ordering and we will help verify fitment.

What Is a Thermistor?

A thermistor is a temperature sensor used by your mini split system to monitor air and coil temperatures. When it fails, the system may behave unpredictably, including poor cooling performance, incorrect temperature control, or shutdown errors.

Additional Notes:

• Stock images may be used for this listing
• Professional installation recommended
• Always match part numbers when replacing HVAC components

Restore your mini split’s performance and avoid unnecessary system replacement—replace the thermistor and get your system running like it should.