When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission.

Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network

HOME > HVAC > CARRIER > FX4BNF048000AAAA > THERMISTOR

Carrier FX4BNF048000AAAA Thermistor

A very basic thermistor is a type of resistor whose rated resistance is solely dependent on the amount of, or lack thereof, heat. They notify the HVAC system when a temperature in increasing or decreasing. The system control board deciphers the temp in a few critical areas to understand what is going on.

Red flags of a faulty Carrier thermister

The heating and cooling system may never start up because of the improperly set thermistor
The main blower refuses in the attempt to ramp up the airflow

This site contains affiliate links for which I may be compensated

Check eBay to see if your thermistor is in stock!

If you are going to be buying or ordering, do your due diligence and cross-check the model number and also make a visual inspection so that you are positive that the correct replacement thermistor is being ordered. Replacing the thermistor is a piece of cake assuming you know what you are doing and have the tools to do it right.

Feel free to download your manual for help.

This site contains affiliate links for which I may be compensated

Check eBay for your thermistor!