A bad thermistor sends incorrect temperature readings to the control board. This causes improper cooling—either freezing food because it's too cold or causing spoilage because it's too warm—or causes the compressor and fans to run continuously.
To know if your refrigerator thermistor (temperature sensor) is bad, look for symptoms like spoiled food, uneven cooling, or a constantly running compressor, then verify it with a multimeter set to ohms.
Replacing a refrigerator thermistor costs between $𝟏𝟓 and $𝟓𝟎 for the part alone. If you hire a professional, expect to pay an additional $𝟏𝟎𝟎 to $𝟐𝟎𝟎 for labor and service call fees, bringing the total repair cost to roughly $𝟏𝟏𝟓 to $𝟐𝟓𝟎.
With proper installation and operation, RTD sensors, thermistors and thermocouples can last between 3 and 25 years. However, several factors can reduce lifespan: Overheating beyond the rated limit.
The most expensive components to fix on a refrigerator are the compressor or the sealed system. Because this involves complex, specialized labor, refrigerant handling, and expensive parts, repairs typically cost between $800 and $2,500+ depending on your fridge's make and model.
The Amish keep food cold using a variety of off-grid methods, tailored to the strictness of their local church district. Common practices include:
Which refrigerator brand is most reliable? All three of the appliance experts we spoke to for this roundup said Whirlpool and LG were the most reliable refrigerator brands due to their durability, reliability and ease of repairs. Samsung and GE were also mentioned by our experts as high-quality fridges.
Thermistors usually fail due to mechanical stress, thermal shock, moisture damage, or natural aging. Because they are responsible for monitoring and protecting systems from temperature extremes, these stressors can lead to broken circuits, short circuits, or inaccurate temperature readings (drift).
To test a thermistor, you will need a digital multimeter capable of measuring resistance (Ohms). First, unplug the device and isolate the thermistor. Turn your multimeter to the resistance (Ω) setting, connect the probes to the two terminals, and compare the ohm reading to your manufacturer's temperature-resistance chart.
Yes, you can absolutely replace a thermistor. It is a very common DIY repair for household appliances like refrigerators, ovens, and dryers. It simply involves disconnecting the power, locating the faulty sensor, unplugging its harness, and installing a new part.
A 10-year-old refrigerator is generally worth repairing if the repair cost is less than half the price of a new unit and the original appliance is a high-end or large model. However, if your fridge is a budget model or requires a major sealed-system repair, it is usually more cost-effective to replace it.
Instructions
The short answer is no. The long answer is that thermistors are not interchangeable brand-to-brand, but they can be interchangeable within the same brand, depending on the manufacturer.
To test a refrigerator thermistor (temperature sensor), disconnect the power and remove the sensor. Set a multimeter to the Ohms (Ωcap omegaΩ) or resistance setting. Test the sensor at room temperature and in ice water. If the resistance deviates more than 10% from expected manufacturer values, replace the thermistor.
Unplugging a fridge does reset it. It clears minor electronic glitches, reboots the control board, and resets sensors.
A faulty thermistor misreads temperature, causing the control board to make the wrong decisions. Common symptoms across devices include erratic temperature control, the device running continuously, abnormal error codes, or complete system failure (such as failure to heat or cool).
PTC thermistors are commonly installed in series with a circuit, and used to protect against overcurrent conditions, as resettable fuses.
To tell if a refrigerator thermistor (temperature sensor) is bad, test its resistance (ohms) using a multimeter. A bad thermistor usually results in temperature display errors, spoiled food, frost buildup, or the compressor running constantly.
Can a thermistor be bypassed till a new one is purchased? You could bypass it if you have something that would be the correct resistance; however, you cannot just jump it as it will not work.
Thermistors usually fail due to mechanical stress, thermal shock, moisture damage, or natural aging. Because they are responsible for monitoring and protecting systems from temperature extremes, these stressors can lead to broken circuits, short circuits, or inaccurate temperature readings (drift).
A thermistor is the primary temperature sensor in modern refrigerators. It acts as a heat-sensitive resistor. By continuously measuring the internal air temperature, it signals the fridge's main control board to turn the cooling system (compressor and fans) on or off to maintain a steady temperature.
Thermistors are easy to use, inexpensive, sturdy, and respond predictably to changes in temperature. While they do not work well with excessively hot or cold temperatures, they are the sensor of choice for applications that measure temperature at a desired base point.
A bad thermistor causes incorrect temperature readings, leading to inconsistent system performance, erratic temperature fluctuations, or total device failure. Because it misreads temperature, it can prevent cooling or heating correctly, or cause a machine to run continuously.
To test if a thermistor is working, measure its resistance using a Multimeter while changing its temperature. Most thermistors are Negative Temperature Coefficient (NTC) types, meaning their resistance should smoothly decrease as they warm up and increase as they cool down.