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Customer Questions and Answers for Defrost Timer by Frigidaire

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Manufacturer Part
4.89 (64)
By: Frigidaire
Part Number: OEM20399667
Manufacturer Part Number: 5304518034

The Defrost Timer is an OEM replacement part for Frigidaire upright freezers. It serves as a crucial component responsible for regulating automatic defrost cycles.

Causes of a faulty defrost timer relate to 20,000+ hours of constant exposure to freezer temperatures as low as -10 degrees Fahrenheit. Such extremes can compromise electrical switching mechanisms over prolonged usage periods.

Symptoms of a failed defrost timer include:

  • Inability to initiate automatic defrost modes  
  • Excessive ice and frost accumulation inside cabinet
  • Warm areas detected due to impaired fan circulation
  • Diagnostic codes indicating defrosting problems

This genuine Frigidaire replacement part is compatible with Kelvinator and some Kenmore units as well.

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Questions & Answers

For Frigidaire Defrost Timer (Part Number: OEM20399667)

1 Answer

Phil, With this being a Montgomery Ward unit, there would be no parts available. When Montgomery ward went out of business they took all the information with them.

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1 Answer

Pat, The thermostat for this unit would be the most likely cause for the unit to run for longer periods or come on right after shutting off.

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1 Answer

Michael, It is possible that the unit is sticking when it goes into defrost and may have a bad defrost timer on it.

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1 Answer

Hello Burrwell. If the temp is good in the unit, then it should turn off. However, it is normal for the unit to cycle so the temp stays cold in the unit. It may be that every time you go to the unit, it is running. But in reality, it turns off when the temp is correct. If it is running to cold, then you will need to replace the temp control 216521100 in the unit. Thank you.

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1 Answer

Hello Andy, The defrost timer will advance constantly when installed so where is it set when installed makes no difference.

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Larry G. for Model Number FCGM181RQBB

I am required to keep my refrigerators in a 1.6 to 8.5 degree Celsius range, (35° to 47°F). I am able to keep that range until the unit goes into the defrost cycle. The cycle lasts about 30 minutes. I have no temperature control for about 16 minutes, twice per day. Depending on what the temperature is when it cycles to defrost, it can be up to 3° warmer. Is there a way adjust the defrost time to run for 20 minutes 2 times a day, or is there another timer that runs for less than 30 minutes. Last year I purchased the same unit FCGM181RQBA and have no issues keeping range. It appears the heater is more aggressive in the newer units. Is that possible?

1 Answer

Hello Larry, There is no adjustment for the defrost time. The manufacturer has designed the unit in this way and it cannot cool during defrost, otherwise the defrost cycle cannot operate. It is considered normal operation for the temperature to vary during the defrost cycle. If it is not remaining cool enough you may need to adjust the settings.

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1 Answer

Hello Patrice. It sounds like the timer is bad and will need to be replaced on the unit.

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1 Answer

Hello Stephan, This will not damage the freezer but the different duration is not what the designing engineers had recommended for your unit. Basically, this means that with a defrost cycle more often, it is more possible to have freezer burn and possible food loss due to improper temperatures inside the unit. Since the part recommended by the manufacturer 5304518034 has not been discontinued, I would obtain one of them and install it for optimum energy efficiency and performance of the appliance.

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1 Answer

Yolanda, If the compressor is not running then you will want to check to make sure that there is 120 vac going to the compressor relay. If there is then the relay will most likely be faulty. If there is not then either the defrost timer would be the issue. Typically when the defrost timer is not working the fan will also not be running inside the unit. If it is not then turn the dial on the timer to see if the unit will click on. If it does then the timer will be the issue.

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