Author Topic: runs but no heat  (Read 2770 times)

Offline aking

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runs but no heat
« on: October 03, 2008, 08:27:05 AM »
Dryer will run has no heat and timer wont shut off. Checked vent and it is not restricted. I need help. Have not removed access panal yet.

Model 110.78202794

Offline JWWebster

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Re: runs but no heat
« Reply #1 on: October 03, 2008, 11:43:19 AM »
If you have power going into the gas assembly do this:
Check the flame sensor first. If it is bad (no continuity) nothing in the gas assembly will work.
« Last Edit: October 03, 2008, 11:53:50 AM by JWWebster »
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Offline JWWebster

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Re: runs but no heat
« Reply #2 on: October 03, 2008, 11:52:56 AM »
If that one is ok next check the igniter. They do burn out from time to time.
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Offline JWWebster

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Re: runs but no heat
« Reply #3 on: October 03, 2008, 11:55:33 AM »
If you have no power going to the gas assembly then replace this fuse:
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Offline JWWebster

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Re: runs but no heat
« Reply #4 on: October 03, 2008, 11:57:10 AM »
This fuse will kill power to the gas assembly but it will not kill power to the dryer, so the dryer will keep going but not heat.
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Offline aking

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Re: runs but no heat
« Reply #5 on: October 03, 2008, 12:30:29 PM »
Where is the flame sensor located?

Offline JWWebster

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Re: runs but no heat
« Reply #6 on: October 03, 2008, 12:39:17 PM »
It mounts on the outside of the burner chamber over a hole in the chamber opposite the igniter. It senses ignition and shuts down the igniter so the coils will have power to open the gas valve.It really does not sense flame its bi-metal bends when it FEELS the heat from that igniter. When the igniter is screaming hot that bi-metal kills the power to the igniter and since it is no longer in the equation those coils now have enough juice to pull open the valve. The gas comes out and hits that igniter and ignites. The blower pulls the heat through to the drum where it warms the drum. The cycle thermostat mounted beside the fuse will judge when the drum is hot enough and shut down the gas assembly. The dryer will continue to run. When the drum cools off to say 99 degrees then the thermostat will again power the gas assembly. This is constantly happening all through the drying cycle. If lint or vent blockage occurs then that fuse will blow and kill the gas assembly before the dryer catches fire. So you need to check the lint and vent for any blockages. Pictured here is a gas assembly. Not a very good pic but hay I ain't got a very good PC.
« Last Edit: October 03, 2008, 12:56:32 PM by JWWebster »
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Offline aking

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Re: runs but no heat
« Reply #7 on: October 03, 2008, 01:00:18 PM »
I have continuity to everything. The fuse, the flame sensor and the cycling thermastat. there is no blockage of lint so it must be the igniter, right. If so where is it? thanks 4 all of the info so far. It has really helped!

Offline JWWebster

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Re: runs but no heat
« Reply #8 on: October 03, 2008, 04:40:43 PM »
It is up in the burner tube. It has a quick disconnect.Use a small wrench to get the screw loose and the igniter will come out. Be careful not to drop it or get your hands on the corborundum filement. It will burn out quickly if you do.
« Last Edit: October 03, 2008, 04:42:40 PM by JWWebster »
May the hinges of our friendship
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About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
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