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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)

Gilberto for Model Number FGHS2634KW0

My refrigerator keeps freezing my food. The temperature readout for the refrigerator varies between 60 and 80 but the temperature inside is about 24 to 27 on a thermometer. The freezer readout varies between -20 and 6 and the temperature inside usually matches. I have tested the freezer and refrigerator thermistors and they both show 8.4k ohms at 77, I'm not sure what the specifications are. Is the problem in the thermistors or will there be a problem in the motherboard?

1 Answer

Gilberto, If the resistance is showing good on the thermistor then this would most likely be a control board issue.

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Belinda for Model Number LFUS2613LEO

Prior to replacing the defrost thermostat the freezer temp would rise intermittently and especially if I had been cooking for hours. I removed the back panel in the freezer and discovered ice balls on the pipe leading from what I believe is the supply pipe on and below the thick goopy feeling tape and on the first bend. The temp was more stable with the ice balls. I defrosted them with a hair drier. Now after changing the defrost thermostat the freezer wasn't going below 12 degrees and at times 22 in the freezer and 35 in fridge. I triggered it to do a defrost cycle with the freezer light. After doing so the display finally registered -1/35 but it still rises more often to 22degrees. I had thermometers in both sides and the freezer overnight. In the morning it was at 5degrees and with food in fridge it registered at 40- 45. Why is it acting up more since I changed the thermostat? You do here the hiss of the freon when the unit is unplugged. So I am not to sure it's a freon problem yet.

1 Answer

Belinda, If you are hearing the hiss of freon when the unit is unplugged then this will be a sealed system issue and will need to call service.

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1 Answer

Jose, This issue would most likely be that the damper assembly is faulty and will need to be replaced. You can test the sensor to make sure that the sensor is good. It should read 5K ohms at room temp.

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1 Answer

James, The issue with this error code will be a open thermistor and will want to check the thermistors to make sure that they are good.

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1 Answer

Joe, For the thermistor there is a cover over the thermistor on the side wall that you remove and then the thermistor will just unplug and plug back in. For the Damper there is a cover over it that is held in by a screw. Remove the screw and cover and then the damper should come out.

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1 Answer

Hello Derek, If the defrost heater shows continuity and the evaporator fan motor in the freezer compartment is running, the main power board 5304497976 is the most likely issue.

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1 Answer

Edgar, If the fan is blowing but nothing coming through the air duct then you will want to check to see if the return air duct behind the crispers is clear. If this checks ok then check the coils in the freezer are not impacted with ice. If it is then test the defrost heater and defrost thermostat to make sure that they have continuity. If they do then the issue will be a faulty control board.

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1 Answer

Samantha, There are several things to check before you replace anything. Check the controls, make sure the setting is F. (fahrenheit) , make sure the controls are set at 5 and 5 (mid range) This should produce a temperature of 38 dgrs F/F and 0 dgrs Frzr(+/- 3 dgrs.) Check the top shelf left side / corner. Make sure there's no large, tall or bulky items on the shelf, blocking or redirecting the air from the damper away from the thermistor , check all the shelves for articles hanging over the edges of the shelves, or against the side or rear walls. Let the refrigerator operate for 24 hours and recheck to see if both temperatures are in range.

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1 Answer

David, This issue would most likely be a faulty start relay on the compressor which would need replaced.

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