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Customer Questions and Answers for Timer, Defrost (6 Hr.) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18028053
Manufacturer Part Number: WP4391974

Defrost timer that advances the refrigerator's defrost cycle at roughly six-hour intervals to help prevent excessive frost buildup and keep cooling consistent. Replaces a failed timer to restore regular defrost scheduling. What it does:

  • Advances the defrost cycle so the heater can melt frost from the evaporator on a timed schedule.
  • Helps prevent heavy ice buildup that can reduce airflow and cooling performance.
  • Common symptoms of a failing timer: excessive frost or ice accumulation, compressor running constantly, or inconsistent temperatures.
  • Works with mechanical defrost systems to alternate between cooling and defrost intervals.
What's included: One defrost timer. Install notes:
  • Disconnect power to the appliance before servicing to avoid electrical shock.
  • Handle connectors and wiring carefully; ensure all terminals are fully seated.
  • Mounting hardware and connector types can vary by model—retain original fasteners and note wiring positions before removal.

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Questions & Answers

For Whirlpool Timer, Defrost (6 Hr.) (Part Number: OEM18028053)

1 Answer

Hello Carol, This unit is rather difficult to access. The doors will have to be removed and the center divider, (units' freezer floor), at least partially removed to clear the ice from the drain. This has to be done very carefully since the evaporator coils lay down in this separator assembly in this design. I'm sorry but this unit is old enough that we do not have a service manual available.

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Joe D for Model Number RB19K-4A Magic Chef Refrigerator

I have a Magic Chef Refrigerator Model RB19K-4A. I purchased a defrost timer part # 4391974 and installed it. My refrigerator defrosts; however, I feel the defrost cycle is not long enough, as I have a rise in temperature above 40 to 42 degrees in refrigerator. The freezer is ok. I manually forced an additional defrost cycle and the refrigerator temperature dropped to 38 degrees. What defrost thermostat would provide a longer defrost time??? 15 to 20 minutes is not enough. I found one that defrosts 25 minutes after 6 hours run time... WR9x502 GE model.. would this one work??

1 Answer

Hello Joe. Sorry, we can only recommend what the manufacturer recommends based on the model number.

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1 Answer

Hello Joe. This is a continuous run unit so the loose lead should connect to terminal 2.

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1 Answer

Darwin, Unfortunately we do not have the wiring diagram for your unit to be able to see if you have a 3 wire hook up or a 4 wire hookup. If you have a 3 wire hook up then you put the jumper off the motor on terminal 2 and then put the extra jumper between pins 3 and 4. If you have a 4 wire hookup, the extra jumper wire will not be used and the black wire from the motor will go to terminal 2 because your unit is cumulative run. If it had been continuous run then it would have gone to terminal 1.

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1 Answer

Hello Schmitty, I always connect the jumper to terminal number 1. This basically means the unit will defrost every 6 hours.

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1 Answer

Hello Wendie, This is a continuous run unit so the loose lead should connect to terminal 2.

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1 Answer

Hello Mike, Put the wire on terminal number 1. This will ensure a defrost cycle every 6 hours.

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1 Answer

Hello Daniel, Replacement timer terminals are straight for connection to a multiple lead wiring plug. Manually bend terminals 2, 3, and 4 with pliers. For 6 hour continuous defrost cycle, attach loose lead to terminal 1. This will insure a defrost cycle every 6 hours.

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