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How do dryers sense moisture? DerbyDad03 11-17-2008
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Posted by DerbyDad03 on November 17, 2008, 10:08 am
I'm having a problem with an Estate gas dryer, model # TGDS740PQ.

One of the symptoms is that the Timer knob moves when in Timed Drying
mode, but not when in AutoSense mode. The other symptom is that it
takes a long time to dry a load in any mode. Even when the clothes are
completely dry, the AutoSense knob, which should move towards Off once
the clothes are dry, never moves. The dryer would run forever if I let
it.

I should point out that the clothes are not always warm when I check
them, whether they are wet or dry. Sometimes they are dry and toasty
warm, sometimes they are dry and cool, sometimes they are wet and
warm, sometimes wet and cool. My understanding of the way the cycling
thermostat works, they should *never* be wet and cool. But even if the
cycling thermostat was bad, why would that cause the knob to not move
in AutoSense mode?

I looked at all the parts for my dryer at the following site and can't
find anything that looks like a moisture sensor. How does a dryer
sense the moisture and decide when it's done?

http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5138494

BTW, before anyone mentions it - I tore the dryer apart this weekend
and cleaned it from the opening in the back of the drum all the way
out to the vent. This didn't help, but there wasn't enough lint to
have caused a problem in any case.




Posted by on November 17, 2008, 11:41 am
On Mon, 17 Nov 2008 07:08:24 -0800 (PST), DerbyDad03

>I'm having a problem with an Estate gas dryer, model # TGDS740PQ.
>
>One of the symptoms is that the Timer knob moves when in Timed Drying
>mode, but not when in AutoSense mode. The other symptom is that it
>takes a long time to dry a load in any mode. Even when the clothes are
>completely dry, the AutoSense knob, which should move towards Off once
>the clothes are dry, never moves. The dryer would run forever if I let
>it.
>
>I should point out that the clothes are not always warm when I check
>them, whether they are wet or dry. Sometimes they are dry and toasty
>warm, sometimes they are dry and cool, sometimes they are wet and
>warm, sometimes wet and cool. My understanding of the way the cycling
>thermostat works, they should *never* be wet and cool. But even if the
>cycling thermostat was bad, why would that cause the knob to not move
>in AutoSense mode?
>
>I looked at all the parts for my dryer at the following site and can't
>find anything that looks like a moisture sensor. How does a dryer
>sense the moisture and decide when it's done?
>
>http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5138494
>
>BTW, before anyone mentions it - I tore the dryer apart this weekend
>and cleaned it from the opening in the back of the drum all the way
>out to the vent. This didn't help, but there wasn't enough lint to
>have caused a problem in any case.
>
>
They use a thermostat in the exhaust. When it starts warming up they
advance the timer


Posted by Bob F on November 17, 2008, 12:44 pm

> I'm having a problem with an Estate gas dryer, model # TGDS740PQ.
>
> One of the symptoms is that the Timer knob moves when in Timed Drying
> mode, but not when in AutoSense mode. The other symptom is that it
> takes a long time to dry a load in any mode. Even when the clothes are
> completely dry, the AutoSense knob, which should move towards Off once
> the clothes are dry, never moves. The dryer would run forever if I let
> it.
>
> I should point out that the clothes are not always warm when I check
> them, whether they are wet or dry. Sometimes they are dry and toasty
> warm, sometimes they are dry and cool, sometimes they are wet and
> warm, sometimes wet and cool. My understanding of the way the cycling
> thermostat works, they should *never* be wet and cool. But even if the
> cycling thermostat was bad, why would that cause the knob to not move
> in AutoSense mode?
>
> I looked at all the parts for my dryer at the following site and can't
> find anything that looks like a moisture sensor. How does a dryer
> sense the moisture and decide when it's done?
>
> http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5138494
>
> BTW, before anyone mentions it - I tore the dryer apart this weekend
> and cleaned it from the opening in the back of the drum all the way
> out to the vent. This didn't help, but there wasn't enough lint to
> have caused a problem in any case.
>

The first thing I'd try is to take it outside, and blow out all the internal air
passages with compressed air or a leaf blower. Gathered lint can cause all kinds
of problems.



Posted by DerbyDad03 on November 17, 2008, 12:54 pm
>
>
>
>
>
>
> > I'm having a problem with an Estate gas dryer, model # TGDS740PQ.
>
> > One of the symptoms is that the Timer knob moves when in Timed Drying
> > mode, but not when in AutoSense mode. The other symptom is that it
> > takes a long time to dry a load in any mode. Even when the clothes are
> > completely dry, the AutoSense knob, which should move towards Off once
> > the clothes are dry, never moves. The dryer would run forever if I let
> > it.
>
> > I should point out that the clothes are not always warm when I check
> > them, whether they are wet or dry. Sometimes they are dry and toasty
> > warm, sometimes they are dry and cool, sometimes they are wet and
> > warm, sometimes wet and cool. My understanding of the way the cycling
> > thermostat works, they should *never* be wet and cool. But even if the
> > cycling thermostat was bad, why would that cause the knob to not move
> > in AutoSense mode?
>
> > I looked at all the parts for my dryer at the following site and can't
> > find anything that looks like a moisture sensor. How does a dryer
> > sense the moisture and decide when it's done?
>
> >http://www.appliancepartspros.com/partsearch/model.aspx?model_id=3D51384=
94
>
> > BTW, before anyone mentions it - I tore the dryer apart this weekend
> > and cleaned it from the opening in the back of the drum all the way
> > out to the vent. This didn't help, but there wasn't enough lint to
> > have caused a problem in any case.
>
> The first thing I'd try is to take it outside, and blow out all the inter=
nal air
> passages with compressed air or a leaf blower. Gathered lint can cause al=
l kinds
> of problems.- Hide quoted text -
>
> - Show quoted text -

Perhaps you misunderstood my last paragraph.

As I said, I cleaned it from opening in the back of the *drum* all the
way out to the vent, not just from the back of the dryer where the
exhaust hose attaches.

This included the internal ductwork, the fan housing, the lint trap
holder and any other place where dust could collect. Air flow is not
the issue.

And for my trouble, I am about a $1.50 richer in loose change.

Posted by PanHandler on November 17, 2008, 2:41 pm


And for my trouble, I am about a $1.50 richer in loose change.

It costs $2.50 to repair. Give it more time, or leave more change in your
pockets.



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