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Dryer hums unless the timer is in "Off" position. No start when turn the start switch clockwise. This happened today, just after drying a load.
For years it has taken a couple of tries for the dryer to "catch" when making a cold start. Usually third twist of start knob did it. Been consistent, so left alone till now. Not opened it up yet. Drum can be turned, but is not free-wheeling.
Start switch sound like most likely issue? Thanks ...
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Hi @ralguy
Seems as though there might be a problem with the start circuit in the motor, either the motor start winding or the centrifugal switch in the motor.
With the dryer turned on and "humming", try turning the drum manually and then see if it continues to run by itself.
If it does then that's the problem. For the motor to start turning current has to flow through both the start and run windings to create enough magnetism to overcome the initial inertia of the motor's at rest position. When the motor gets up to speed the centrifugal switch in the motor operates and disconnects the start winding and the motor continues to run on the run winding only. The start winding is disconnected as it has only very thin wires and you don't want it to burn out, the run winding has thicker wires so that it can run for a long time.
When the motor has stopped the centrifugal switch releases and reconnects the start winding back into the circuit for the next start
Unfortunately, unless the switch is easily accessible (usually it's buried in the motor windings) you can't test which is the problem and the motor will have to be replaced.
The motor part # is WE17X10010. Search online using the part number only, to find suppliers that suit you best.
Here's the mini manual for the dryer that may help as it shows the motor windings and the centrifugal switch
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Many Thanks, jayeff! moved the timer to a 'run' setting, held in the door switch, and moved the drum. Fired right up, and is working now as normal.
Do you think the humming was the run windings alone, or the start windings trying but too weak? Just curious.
Will check out replacement motors. Sometimes these current part numbers supersede numerous old ones. Can be made to fit, but not automatically a drop-in replacement. TBD
The humming generally means current only through 1 winding, not both i.e. start and run windings but if it continues to run, if assisted to start by manually turning the drum, the problem is the start winding or its circuit and the only things particular to it is the winding itself or the centrifugal switch as the rest of the motor circuit is common to the run winding also.
Does "...is working now as normal.", mean that it now starts turning of its own accord when first started, every time?
It could be a faulty centrifugal switch (sticking contacts?) not allowing current to flow through the start winding but maybe then it is intermittent. If it is intermittent it may be hard to track down.
The next time it doesn't start and is humming, turn it off and then just manually rotate the drum for maybe 5 complete turns and then try starting it normally i.e. DO NOT do what you did before with power turned on and door switch manually operated, just turn the drum
If it starts OK normally after doing this then more'n likely the centrifugal switch was sticking operated and not releasing when the drum stops turning and reconnecting the start winding back into the circuit for the next dryer operating cycle. Also usually motor windings don't come good by themselves ;-)
If this is the case the motor will have to be replaced anyway as you can't get to the switch.
Better that it sticks operated than not operating when it should as this would burn out the start winding and possibly cause a fire.
I got the part number for the motor for your model from a supplier's website in the USA but the tech sheet I linked also has the part numbers -bottom right.
If your dryer is connected to 120V AC then it says WE17M22 which turns out to be associated with the same part number I linked in my answer above
Hi jayeff: After following the sequence you outlined one time, I dried a couple of loads yesterday. That was probably 4 or 5 normal restarts using just the control knob, as designed.
Next week, I will be able to see how it does on a cold (more than 24 hours unused) start. If needed will do as you say above (timer off, turn drum manually)
I understand the motor still needs replacing.
" Better that it sticks operated than not operating when it should as this would burn out the start winding and possibly cause a fire." Until I replace the motor, will turn off the circuit breaker. I am only at this house about half the time.
Thanks again for your thorough explanations and help.
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