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Customer Questions and Answers for Defrost Timer by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18031701
Manufacturer Part Number: WP68233-3

This defrost timer controls the automatic defrost cycle in select refrigerators and freezers, switching between cooling and defrost to clear frost on the evaporator. It helps maintain stable temperatures and prevents heavy ice buildup and long run times. What it does:

  • Alternates the system between cooling and defrost on a timed schedule
  • Sends power to the defrost heater during defrost, then returns power to the compressor and fans
  • Failure can cause heavy frost on the evaporator/back freezer wall
  • May lead to warmer temperatures, constant running, short cycling, or no-cool if stuck in defrost
What's included:
  • 1 defrost timer
Install notes:
  • Disconnect power before servicing
  • Access location varies by model
  • Note wire positions and transfer them one at a time to the new timer
  • Mount securely in the same orientation as the original and verify normal cycling after power is restored

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Questions & Answers

For Whirlpool Defrost Timer (Part Number: OEM18031701)

William L. for Model Number ctb1924arw

Ice in tray starting to melt so i did some checks, asked a question here and found defroster cycle was not working correctly, made diagnosis and replaced defroster thermostat and also defrost timer, now defrost cycle is working correctly however the unit turns off and stays off untill temps in freezer hit 45-50 degrees. Local repairman says the compressor is getting to hot and shutting off . Temp. at the compressor is about 138 degrees. Woke up this morning and unit was off, temp in freezer is 45 and compressor temp is 78 degrees. If compressor was shutting down cause of overheating then once temps drop shouldn`t the unit turn on again? Any direction would be helpfull.

1 Answer

William, Based on the post, it sounds more like a crossed or shorted wire at the defrost thermostat or defrost timer ? I wouldn't start at the compressor, until I rechecked the wiring at the new components and maybe the temperature control. Thanks and Good Luck.

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William L. for Model Number Magic chef cbt1924arw

Ice is melting in tray, ice maker is working but it appears that it melts then re freezes. I noticed that refrigerator is not running even though temp is above freezing. I removed the back cover in the freezer and coil was frozen so I switched the defroster timer to defrost and element did not heat up. I did not have continuity over defrost t-stat so I replaced it and now element gets hot. After a couple days the unit seems to be better but ice cream is not solid and temp goes up to 33 degrees in freezer I`m assuming while in defroster mode. Can defroster cycle take to long and cause this? Should I also replace timer? Unit is 10 years old. Thanks

1 Answer

Hello William. You will need to check and make sure you melt all the ice off the coils where they were frozen over. If there is ice still on the coils, it will cause the unit not to cool properly. If it is sticking in defrost, you will need to replace the timer WP68233-3. Hope this helps.

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1 Answer

Kurt, Yes there should be a continuity reading between terminals 1 and 3 at the defrost timer. On the RX1 setting , you would read a closed circuit. the 39K ohms, is the timer motor winding resistance and the resistor. If the resistor was bad, you'd have no resistance reading. Good Luck.

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1 Answer

Hello Chris. You will want to check the connections going and coming from the timer to the heater and defrost tstat. If all wires are intact you should test the defrost tstat, it should read close for continuity when cold. Depending on your serial number will determine which thermostat is appropriate for your unit. For the defrost heater WP61002045 you should get a resistance reading. You will need a multi meter to test these components MA-DM1. Here is a link you can refer to for help with using a multi meter: http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html . Hope this helps!

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