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Kenmore 110.66712692 dryer - no heat or motor

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Posted: Mon Nov 15th, 2010 12:40 am

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Single Phase
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My dryer motor does not turn, there is no heat, but the light comes on when I open the door.
The Breaker and outlet (30 a 250v 3-wire, 10 ga copper) are fine. 250v pole -to-pole, 125v line -to-neutral on both sides. The breaker has never tripped.

All the vents are clear. There doesn't seem to be any unusually heavy build-up of lint.
I can find no signs of excessive heat, arcing or, shorting out.
All the conductors look good, no discoloration on the sheathing and they all seem to be supple.
No signs of corrosion either. the heater coil tested just over 10 ohms.

A couple of weeks ago it stopped in mid-cycle. I pushed the start button and it came back on. It did that a couple of times, then ran just fine.
Friday night it gave-up the ghost and has not come back on since.

It has never made any unusual noises or given off any odors.

I have the Repair parts list (I have saved all these years) and a wiring diagram that I found taped inside the top console underneath the timer.

Any help you can give would be greatly appreciated.

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Posted: Mon Nov 15th, 2010 12:48 am

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RegUS_PatOff
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Is the white Thermal Fuse on the Blower Housing good ?

click on picture

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Posted: Mon Nov 15th, 2010 01:11 am

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Single Phase
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My ohm meter shows no continuity.
As fuses go, that usually means its blown.

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Posted: Mon Nov 15th, 2010 01:25 am

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RegUS_PatOff
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Single Phase wrote: ... usually means its blown.

yes,

two possibilities:

1) the Heater Element is partially shorted to chassis (ground) allowing the Heat to be ON without the Blower running ..
check with OHM meter

2) Dryer Vent:

Vent should be rigid metal.

Short lengths of flexible metal may be OK, if not crimped when moving the Dryer into place.

NO plastic

NO PVC

NO screws

Foil Duct Tape is OK.

With an empty load, Timed Dry, High Heat,
the vent temperature should cycle somewhere between 135F and 160F

If you have a Harbor Freight Store near you,

click on picture $ 2.99

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Posted: Mon Nov 15th, 2010 01:42 am

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Single Phase
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I will give the thermal fuse a try and see how it goes.
I know that sometimes fuses blow for a reason.
Fixing a fuse doesn't always mean one has fixed the root of the problem.

I removed the Heater Element from the heater box and found no obviously visible signs of acring.

What is the working impedance range for the coils?

Thanks again for the help.
My wife wants to bake you some cookies.

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Posted: Mon Nov 15th, 2010 01:46 am

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6^th Post

RegUS_PatOff
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Single Phase wrote: .. What is the working impedance range for the coils? ..

about 10 OHMs..

also measure OHMs to chassis (ground)

no need to disconnect anything (except power cord from Wall Outlet)

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Posted: Tue Nov 16th, 2010 07:47 pm

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Single Phase
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One Thermal Fuse later, its working like new.

Thanks again for the help.

~S P

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Posted: Tue Nov 16th, 2010 07:48 pm

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RegUS_PatOff
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it may blow again if the cause isn't found ...

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Posted: Tue Nov 16th, 2010 11:33 pm

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Single Phase
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Nothing is perfect, nothing lasts forever.

When I said the vents were clear, that was just the Vent going out of the house.
The Lint Chute Assembly did have a lot of lint in it. It was substantial!

I think that the accumulation reduced the airflow enough to bring-up the exhaust temperature and short the fuse.

I took a bunch of things apart so I could remove as much of the excess lint and dust build-up as I could.

I also made it a point to Vacuum every electrical connection I could get to.
What I couldn't get to by Vacuum I cleaned with a small disposable paint brush.
Being in the Electrical trade I was a bit embarrassed by how bad it really was back there.
Under the right conditions, dust can combust in ways that will ruin your day.

S P

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Posted: Tue Nov 16th, 2010 11:36 pm

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Single Phase
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I found dust/lint on the Internal Bias thermostat and the High-Limit Thermostats.

Cleaned those off as well.

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Posted: Wed Nov 17th, 2010 12:43 am

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RegUS_PatOff
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Single Phase wrote: ... I was a bit embarrassed by how bad it really was back there.

... dust can combust in ways that will ruin your day.

this is embarrassing and will ruin your day
:spaz:

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