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Customer Questions and Answers for Refrigerator Temperature Sensor by Frigidaire

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Manufacturer Part
4.89 (64)
By: Frigidaire
Part Number: OEM21729474
Manufacturer Part Number: 240597220

Fixes incorrect temperature readings and short cycling. This thermistor monitors fridge temps and signals the control board. Moderate DIY repair.

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Questions & Answers

For Frigidaire Refrigerator Temperature Sensor (Part Number: OEM21729474)

1 Answer

Jerry, There should be temperature sensors on the side wall of the refrigerator and rear wall in the freezer compartment. There is normally a cover over them.

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1 Answer

Don, Check to make sure that the fan motor in the freezer is working. If it is then check to make sure that the evaporator coils are not completely iced up which would indicate a defrost issue. If they are frosted up then you will want to test the defrost heater and thermostat for continuity. If there is continuity then the control board will be the issue and if there is no continuity when the thermostat is in ice then the thermostat would be the issue.

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1 Answer

Hello Brian, check behind the air tower, it is connected to the same main wire harness as the damper.

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1 Answer

Hello Henry, the freezer thermistor is located on the left side wall behind the pull out drawer under a small cover, the fresh food thermistor is located to the right of the center shelf support bracket just above the crisper ion the rear wall.

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Rick for Model Number FGHC2331PFAA

My refer/freezer keeps the right temp I set it to but the freezer fan motor runs all the time. I have changed the temp sensor in the refrigerator thinking it might be that, but no luck still runs. I have checked the door seals they look good, also took off the bottom cover below the doors and vacuumed and cleaned everything I could get to and it just will not stop running. I live in Texas and we went through that winter storm and the power was off on and alot. The unit is approx. 5 years old and been working fine up till now. Out of ideas, I need help.. Thank You Rick

1 Answer

Rick, Check the freezer temperature sensor to make sure that the sensor is good. If the sensor is good then this will likely be an issue with the control board. The part number for the control board is 5304498781.

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Richard for Model Number FGHC2331PFAA

Side by side refrigerator, Refrigerator side is warm 40 to 55 degrees, and temperature display shows OP, -30, -20, and counts back to normal temps throughout the day, 37. 35 etc. At this time I have changed the temperature sensor on the refrigerator side, the damper, and the refrigerator's main control board. The freezer size temperature is 0, and the temp display works fine. Diagnostic tests only show problems with refrigerator thermistor OP. Do I have a second temperature sensor? Do I need to change the freezer temperature sensor? What else should I try?

1 Answer

Richard, there are two sensors 240597220 in the refrigerator. One is located up at the top and one is located at the middle of the refrigerator. It would be recommended that the one that was not replaced is tested for resistance. At 40°F it should measure 26044O and at 55°F it should measure 17414O.

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Darrahg for Model Number LGHB2869LF4

Fresh Food cabinet gets warm after a few days, freezer will then start to warm, both temps with then fluctuate every few hours. Freezer evaporator is encased in ice. I have so far replaced a bad defrost thermostat and the fridge thermistor and damper. I have tested the defrost heater both continuity/ohms - 26.3 and made a jumper to bypass the thermostat, it gets hot! (accidentally burnt myself!) I tested the high and low voltage at the inverter and ohm'd the compressor, all 3 right under 19. The wiring diagram shows a freezer thermistor (same part as the fridge), but I cannot find it anywhere. The only wires I have are going to the evap fan and to the heater/thermostat. There is one little covered port in the top of the freezer - would it be located there? Logic would say located by the coil.

1 Answer

DarrahG, As far as a thermistor goes in the freezer, it will be located either on the back wall, one of the side walls or the ceiling. It will not be on the evaporator. This unit does not implement a thermistor to work as part of the defrost system and it does sound like this is the type of issue that you are having. Test you defrost thermostat to make sure that when it is sitting in the ice on the evaporator coil that it has continuity to it. Keep in mind that it would have to get down to 15 degrees to test closed for continuity. If the thermostat is good then this will most likely be a faulty main control board causing the unit to not defrost which will effect both the refrigerator and the freezer compartments.

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Tom for Model Number LGHB2867PF2

Freezer is not maintaining temperature (warming up to 34). Evaporator coil is frozen up. Defrost sensor is open so forced defrost does not energize heating element. Remove switch and hard wire across to heating element to allow forced defrost. (Heating element 28 ohms). Question 1 I believe this means that I need a defrost sensor. At this point the freezer is at room temp but temp reading on front door reads 0 deg F. Refrigerator is 34. Question 2 Is there a thermistor that needs to be replaced?

1 Answer

Bon, unfortunately, the model number provided is not showing as a valid model. If the model and serial numbers could be verified and provided in a new inquiry, this will allow for the most accurate information to be presented. Generally, the freezer temperature would need to be checked with a thermometer to identify if it is below 10°F as the ice maker will not harvest properly if it is not.

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