Create a playful caricature of a fridge with a thermometer in its mouth, shivering from cold. The fridge should have a cartoonish face with wide eyes and a comical expression as if it's cold despite being a refrigerator. The thermometer should be classic, with the mercury level low to indicate coldness. The fridge's 'hands' are wrapped around itself, and it has 'teeth' chattering, emphasizing the shivering. Add a frosty background to accentuate the chilly theme of the image.

A Guide to Temperature Problems

Troubleshooting Refrigerator Thermistor Issue

5 minute read

Are you experiencing issues with your refrigerator’s temperature regulation? Often, these temperature problems stem from a malfunctioning refrigerator thermistor, a small but crucial component that ensures efficient operation of the compressor and fan motors.

What is a Refrigerator Thermistor?

A thermistor is a temperature-sensitive resistor, typically the size of a Lima bean, which plays a vital role in monitoring the temperature within your refrigerator or freezer compartment. Some models may have multiple thermistors to accurately gauge the conditions in different areas, such as near the evaporator coils.

a picture of a fridge sensor

Locating the Thermistor

You’ll usually find the thermistor attached to the interior liner of the refrigerator or freezer compartment, behind a cover or a rear compartment panel. In cases where it monitors the evaporator’s temperature, it’s directly attached to the refrigerant tube.

a picture of a thermistor placement

Thermistor's Role in Refrigerator Function

The thermistor signals the control board to regulate voltage to the compressor and fan motors. By doing so, it maintains the desired temperature in the refrigerator and freezer compartments. It also plays a critical role in the defrost cycle, especially with the defrost thermistor, which signals when to initiate and conclude the defrosting process. Any malfunction and fridge will have temperature problems.

Testing the Thermistor with a Multimeter

If you suspect thermistor issues, testing it with a multimeter is a straightforward process. After isolating the component, check its resistance at room temperature. Typically, a functioning thermistor should show an ohms of resistance value consistent with the manufacturer’s specifications. Any significant deviation could indicate a fault.

Symptoms of a Faulty Thermistor

A defective thermistor might fail to detect temperature changes, leading to overcooling or insufficient cooling. In the defrost cycle, an impaired thermistor might not activate the defrost heater, causing frost buildup on the evaporator coils.

Fridge ice build up repair Ottawa


Understanding and maintaining the thermistor in your refrigerator is key to its optimal performance. If you’re facing persistent temperature problems or are unsure about conducting tests, consider seeking professional assistance. Regular checks and timely repairs can save you from larger, more costly refrigerator problems in the long run. Here at FairApplianceRepair we provide unmatching quality service in appliance repairs throughout Ottawa.

I'm so glad that I called them for my dishwasher repair. [...] I highly recommend them.

Anthony Ho
Local Guide

Professional and very quick, I would reach out again and again. [...] So worth it.

Mehrdad Safaei
Local Guide

I have personally used and recommended them to many of my clients. Always a good experience.

Patricia Chiarelli
Ottawa Real Estate

[...] Fully recommended to anyone needing their appliance trended to.

Tony McCulloch
Satisfied Customer

Check our social media for more!