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Buzzing noise, won’t start even after replacing motor

Dryer is making a buzzing noise when pressing start. With multimeter, I checked the start switch, timer, thermal fuse, door switch and all were good. Replaced the motor. Now I can get it to start when holding the start switch and door switch and turning the drum by hand. The motor will also start when the drum is out. When the drum is in, it still just makes a buzzing sound and won’t start. Did I maybe get a bad motor?

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Hi @alessi08 ,

What is the make and model number of the dryer?

da

Whirlpool WED5100SQ0

Electric dryer

I also changed the belt and the thermal fuse just in case but neither fixed the issue.

da

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@alessi08

You say that it starts OK when the drum is out or when you rotate the drum manually on starting so I'm wondering if there is a problem with the rollers or perhaps the idler puller applying too much tension on the drum or belt.

Do the rollers spin freely? Does the drum rotate freely by hand when the belt is removed?

If they are OK then it may be the motor. With most electric motors for dryers there is a start winding and a run winding and what happens is that current flows through both windings on start up to create sufficient magnetism to overcome the inertia from the at-rest position. Once the motor gets up to speed then an internal centrifugal switch in the motor operates and disconnects the start winding as the motor can run on the run winding only. Also the start winding has thin wires as opposed to the run windings thicker wires and you don’t want the start winding to burn out through prolonged use.

There are videos on YouTube that show how to test a Whirlpool dryer motor but you may need a clamp meter to test the current on startup and run. It may be a faulty centrifugal switch in the motor not reconnecting the start winding when the motor is not operating.

Also sometimes there is a tech sheet in with the dryer taped to the body inside somewhere and this usually has the wiring diagram as well, which may help. I found the tech sheet part number for your model 677818L but unfortunately I can't find a free one online to check

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Thanks so much for taking the time to answer. Both drum rollers spin freely and the drum spins freely with no belt. I do have the wiring diagram and used it to test the timer. I don’t think I have access to a clamp meter to test the motor so I’ll wait for the 2nd new motor to be delivered and hope that does the trick. Thanks for explaining the run and start windings. Makes more sense now. I know more about dryers (at least this one dryer) than I ever thought I would.

da

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Alessi sarà eternamente grato.
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