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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

Hello Chris. Check for a full frost pattern on the coils. It sounds more like a sealed system issue or the cold control. If sealed system, you will need an HVAC tech to repair the unit.

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1 Answer

Hello Charlie. Look for an even frost pattern all over the coils inside the freezer. If there is not one, you have a sealed system failure and will need an HVAC tech to repair the unit.

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1 Answer

Hello sadiemae. It could be a bad fan motor, a defrost issue, or a sealed system issue. Check the fan and make sure it is running. Make sure there is not a defrost issue. If all is good, then it is a sealed system issue.

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David for Model Number 2539287413

AppliancePartsPros e-analysis: On my Freezer 2539287413, In my Timer 216517400, the compressor-timer terminal(1-4), on the 'points' type terminal leaf's showed burnt/globule, and high R.. due to start-up arcing after defrost cycle .. and may have stuck .. and may-be this is a current surging problem on start-up ... Have noticed the current rating difference of 15A,1/2hp for the Timer 297318010 china; changed to 10A,1/3hp for the 216744400 mexico, with the same Mfgr symbol/logo on them ???, that Kenmore recommends .... This would seem to be related to my problem, was their a fix and/or a cost reduction at the same time ??? Which part are you shipping ?? What are your shipping charges ??

1 Answer

Hello Spike, Being a Frigidaire, I would guess the temperature control first, since this has been a common failure on their models.

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1 Answer

Hello Rommel, It is not abnormal for the shelving to not feel cold but the walls to be cold due to larger surface area. The way to find out if it is cooling properly is to put a thermometer in the middle of unit and see what the temp is. You should be at about 0 degrees plus or minus 5.

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1 Answer

Hi. Is there any frost on the back wall of the freezer? Advance the defrost timer part # 5304518034 in the back of the lower cabinet to the Ist heavy click. Timer contacts close between contacts 2 and 4 to send the voltage to the heater. This activates the defrost heater through the normally closed defrost thermostat part # 297216600. If the heater part # 216608500 does not come on then remove the back wall of the freezer and test for 120 vac on one of the incoming defrost thermostat leads -to-ground. If it is there and not out of the other side lead of the thermostat then it is not closed (in temperatures below 14°). If so then ohm out the heater for closed continuity as it need to have resistance value of 11-18 ohms. If the timer turns hard then replace it. It turns very easy in small increments and quickly passes from the first heavy click(defrost begins), to the last 2nd heavy click -terminating 25 minutes defrost time length. This is a usual NO-COOL. Make sure the compressor runs as the temperature is in the mid position. Thank You.

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1 Answer

Hello Richard. There is no preset time for the defrost cycle. Usually the defrost cycle is 15 to 30 minutes on the timer 5304518034.

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1 Answer

M, No you do not need to apply 120 VAC to the timer to activate the circuits. You should not read closed circuits on all the terminals at the same time here's a quick easy test. Term.1 (blu) to term. 3 (wht) should have resistance or "closed" circuit at all times, this is the timer motor. Term.1 (blu) to term. 4 (yell) will have a closed circuit when the timer is in the cooling mode(longest increment) When the timer advances, is advanced into the defrost mode(shorter increment), term. 1 (blu) and term.2 (orng) is "closed, to the defrost heater / thermostat, and term 1 (blu) to term 4 (yel) opens. Blue to yellow and blue to orange should not have "closed circuits at the same time. Make sure you label and disconnect the wire harness from the timer before you test the circuits. Thanks

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1 Answer

Hi Francis. If you have to manually advance the defrost timer the it is due time to replace it. The motor or the internal contacts have stuck shut not allowing the timer's normal adcancements. Timer,defrost,115v,tab Item Number: 5304518034. Thank You.

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