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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)

John M for Model Number FFU14FC4AW0

This freezer has the compressor running, the floor stays cold enough to freeze items at that level, but anything on the upper shelves thaws out. The evaporator fan does not run but has continuity through the motor, as well as the defrost thermostat and heater. When first noticed, at disassembly there was ice accumulation under the coil and frozen through the drain, which looks like the defrost cycle has run, possibly excessively. The thermostat control seems to be turning on and off as you can hear the compressor kick on and off. Any suggestions as to what to look at next.

1 Answer

John, You will want to test the power coming to the evaporator fan motor and see if there is 120 vac to it. If there is then the motor is bad and would need to be replaced.

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1 Answer

Hello Prescott. If it is frozen over, and the unit worked by manually putting it into defrost, you will need to replace the timer.

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Mike for Model Number Frigidaire Commercial Series FCGM201RFB

HI there, my fridge uses this timer for a defrost mode. Could you confirm that this timer should turn the defrost mode on every twelve hours for about 20 minutes? In my unit the defrost runs for about 12 hours and shuts off for about 20 minutes when the timer clicks and then on again after 20 minutes I suspect my unit is wired wrong or is there perhaps a N/C version of this switch when I should have the N/O?? PS - this is not the compressor running, you can hear that kick on/off normally but there's an almost constant fan/humming sound which I'm assuming is the defrost mode

1 Answer

Hello Mike. Part number 5304518034 is a 12hr run timer. It's keeping track of how long your compressor stays on, once it reaches 12hrs it will turn it on a defrost cycle. On average the defrost cycle is from 25-35 mins, hope this helps. Thanks!

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1 Answer

Hello Ron. The timer does rotate, but it is extremely slow and you will not be able to watch it turn. It sounds like you may have a sealed system issue, and not a timer issue.

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1 Answer

Hello Brian. Touch the meter leads together and if closed, the timer should read the same.

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