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Customer Questions and Answers for Timer (Fm-3) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18040668
Manufacturer Part Number: WP8578906

This mechanical cycle timer controls the sequence and duration of operations in your appliance. Replacing a worn timer restores proper cycle advancement so the machine starts, progresses, and shuts off at the correct times.

  • Advances the cycle by opening/closing internal contacts at set intervals
  • Coordinates stages such as start, run, and end-of-cycle depending on model
  • Common failure signs: won't advance through the cycle, stops mid-cycle, runs too long/short, or won't start/stop
  • Helps correct intermittent or inconsistent cycle timing
What's included: Timer Install notes:
  • Disconnect power before service; allow any moving parts to stop completely
  • Access timer from the control console; note wire positions before removal
  • Transfer any mounting clips/brackets from the old unit if present; align shaft with knob
  • After reassembly, run a test cycle to ensure proper advancement

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Questions & Answers

For Whirlpool Timer (Fm-3) (Part Number: OEM18040668)

Scotto for Model Number WED5540SQ0

Our dryer wont start. tested the thermal fuse and its ok. tested the push button on switch and it was ok. Tested the door switch and it was bad replaced it. Still wont start. Thinking it could be the timer. if you turn the timer and push the start every once in awhile it starts for a very brief moment. could that be the issue. We are elderly and have to care for our grandchildren so I don't want to make a costly mistake. I will probably have to sell something to get the cash for the part. looks to me like it is close to $100.00

1 Answer

Hello Scotto. Based on the information you provided, it sounds like the timer is the issue. If you order it and it does not fix it you can return it to us.

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Rick for Model Number MED5640TQO

I have the Maytag Performa Series. My daughter finished drying clothes and then went to do another load and nothing. I checked all the thermal fuses, checked continuity on all the switches with the exception of the timer. If I turn the timer, the on/off switch clicks but nothing. Turning the timer a few times and hitting the switch the dryer started working again but when the door was opened to the dryer it died again. Now nothing. Can't duplicate that one occurrence where it started again. The switch on the dryer door turn the inside light on and off, I didn't check the continuity but assume since the light is turning on and off it's ok. No motor smell. Cleaned all the contacts but I see no corrosion anywhere. I don't mind buying the timer if that is what it is, or can someone recommend anything else? Thanks

1 Answer

Rick, You will want to check the start winding on the motor to make sure that it is good. Also check the continuity of the door switch to make sure that it has continuity when closed. The switch could be bad and just pushing the contact enough to turn off lamp but not make contact to start. The winding in the motor should ohm out between 2.4 and 3.8. You would check start winding from black to blue, and check run winding from White to blue. If these check ok then it would sound like the contacts in the timer are sticking. You could also check your push to start switch to make sure that it is good. You should have continuity when pushed and none when released.

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1 Answer

Bryan, Reset the breakers for the dryer several times. Then check and make sure you have 220/240 VAC at the terminal block on the back of the dryer. If all's OK, you'll need to raise the top, remove the front panel and check the thermal fuse WP3392519, on the blower housing if it has an "open" circuit, the motor won't start and run. It may also indicate an "overheating" situation, so check the exhaust vent and vent hood for restictions, kinks and clogs. Thanks

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1 Answer

Hello Debbie. Based on the information you provided, it sounds like the timer WP8578906 is bad and will need to be replaced. Make sure the wires are good and tight. If so, replace the timer. Hope this helps.

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1 Answer

Hello Michael. Will the dryer run in the other cycles? Is this a heating issue your having? Thanks

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