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Customer Questions and Answers for Defrost Timer (M480-Even) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18037758
Manufacturer Part Number: WP8299771

This is a mechanical defrost timer that controls the automatic defrost cycle of the refrigerator. It periodically shuts off the compressor and energizes the defrost heater so frost can melt, helping maintain proper cooling performance.

  • Cycles the unit between cooling and defrost at set intervals
  • Stuck or failed timers can cause warm temperatures, heavy frost, or continuous running
  • Can also cause short-cycling or no-cool if contacts fail
What's included: One defrost timer assembly only. Installation notes:
  • Disconnect power before servicing
  • Access is typically from the control housing or rear service area; note wire positions before removal
  • Replace one-for-one with the same terminal orientation; do not force the cam
  • After install, allow one full cycle to verify defrost operation

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Questions & Answers

For Whirlpool Defrost Timer (M480-Even) (Part Number: OEM18037758)

1 Answer

Hello AC. It sounds like the venting system is clogged or kinked. You will need to check the vent and clean it out. Be sure and clean the vent pipe and the dryer air duct assembly. If the air flow is not good, the unit will retain moist air causing the clothes not to dry. Try running the unit with the vent unhooked from the back of the dryer and see if the dryer works properly. Hope this helps.

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Kent for Model Number 110.74992300

The dryer will not start, run, heat up....nothing. If you set the timer you can hear it run; sometimes it runs thru the cycle it is set for, and other times, it only runs for a few seconds. Pushing the start button causes the timer to quit. The thermal fuse appears to be good when tested with a digital VOM. The thermistor when cold and out of circuit tests open. Without a wiring diagram, I am not sure where to look for the problem. I am hoping you can provide some direction. Thank you

1 Answer

Hello Bdobbs, it sounds as though you may have a problem with the start switch on your motor. It's the plastic piece on the motor where the wires attach. It has to be activated once you release the start button and it doesn't sound as though that's happening. Sometimes lint will build up around the centrifigal mechanism and keep it from working correctly. If the switch itself is bad it will require ordering a new motor.

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