How do I know if my freezer thermistor is bad?

The freezer thermistor, along with the fresh food thermistors, will send signals to the main board so that it can determine when to turn the compressor off/on, speed up/slow down/cut off the fans or open/close the damper. If one of the thermistors is bad the refrigerator will not cool correctly.

How do you check thermistor on a Frigidaire upright freezer?

ANSWER Hello J.W, to check the thermistor set to control to “4” then press both the up and down arrow at the same time for 3 seconds to initiate the service mode. If “0” appears in the display the thermistor is open. If “C” appears in the displays the thermistor is shorted.

What happens if a thermistor fails?

When a thermistor is failing, it’ll display incorrect temperatures, or you’ll see impossible temperature fluctuations. When a thermistor in a car is failing, the AC system will blow cold air for a short time or the blower will stop functioning correctly.

What causes a thermistor to fail?

The most common failure mode of a thermistor is an open circuit, as shown in Table 1. The cause of such failures are usually due to mechanical separation between the resistor element and the lead material, caused by handling damage, excessive heat, thermal mismatch, etc.

What causes a thermistor to go bad?

What happens when a defrost thermostat goes bad?

Defrost Thermostat Specifications. A faulty defrost termination thermostat may result in the defrost heater never heating and a solid frost buildup on the evaporator coil, which results in too warm temperatures. The thermostat contacts are normally closed and have continuity until it reaches 140 degrees.

Where is the thermostat on an upright freezer?

On older upright freezer models, the temperature control is usually located in the middle of the rear wall of the interior cabinet liner. On newer upright freezer models, the temperature control is usually located on the exterior front of the unit on the door.

What does a thermistor do?

Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in body temperature.

Can you bypass a thermistor?

Generally speaking, a thermister is a resistor that is sensitive to/affected by ambient heat. When the ambient heat changes, it’s value will change. You can bypass it with a regular resistor, but you have to know the value associated with the thermister.

What can damage a thermistor?

The most common cause of a failing thermistor is an open circuit that results from the mechanical separation between the lead material and resistor elements. This happens because of improper handling, heat damage, and thermal mismatch. With time and use, thermistors can display incorrect temperatures.