Author Topic: No Heat in Dryer  (Read 3901 times)

Offline TimP

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No Heat in Dryer
« on: September 25, 2008, 08:41:09 AM »
Hello,

I have a Whirlpool Dryer, model LGT7646EQ3, manufactured 1999.  It is a gas dryer, not electric.  The electronics work fine, buzzer fine, door fine, all of a suden, there is absolutely no heat in the unit.

First time fooling around with trying to fix a dryer.  I figured it might be the ignitor (I have replaced them on ovens).  I replaced it, but still no heat.

Looking over the parts list, the only other part that may make sense is the Thermal Fuse.

Any help would be appreciated here; thanks.

Model Number: LGT7646EQ3 icon

Offline RegUS_PatOff

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Re: No Heat in Dryer
« Reply #1 on: September 25, 2008, 09:51:59 AM »
Thermal Fuse would be the first item to check.
Does the Drum Motor run ?
Does the Ignitor glow ?
Intermittent Gas Valve Coil
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Offline TimP

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Re: No Heat in Dryer
« Reply #2 on: September 25, 2008, 10:32:15 AM »
Drum Motor works fine.  The dryer works on all settings; just no heat.

How can I see the ignitor when the unit is all togther and running?  What are the conclusions if it is glowing/it is not glowing? 

What should I look for on the fuse?  What are the conclusions of what I see?

Is there a relationship between the ignitor and the fuse?

I'll hold off questions on the coil for now.

Many Thanks!

Offline JWWebster

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Re: No Heat in Dryer
« Reply #3 on: September 25, 2008, 04:47:00 PM »
The flame sensor must have continuity or the glow thingy won't ignite. The way it works is when the dryer starts up and the drum is cool the control thermostat sends 120 volts  into the gas assembly and fires up the glowbar, flame sensor, and the operating coils all at once. The glow thingy comes on, but the gas will not yet ignite. Why? Because that glow thingy is robbing all of the power necessary to yank open the floodgates; so what happens is we need to find a way to shut down the glowthingy and open them gates. How do they do it? With a flame sensor! The flame sensor has a bi-metal in it which when it is cool it lets that there igniter come on. As the igniter warms up the bi-metal inside the flame sensor starts to bend. When it gets too hot for that bi-metal it shuts down the glow thing! Then what happens? All of the power rushes into those operating solenoids, they snatch up the gates and the raw gas flows freely onto that now smouldering hot glow bar and Kawhoosh you have flames. Got any marshmellows? When the flame comes on the heat is transferred to the rotating drum and out the blower vent. IF the vent has a restriction then the FUSE that is mounted on the blower housing next to the controling thermostat will blow and kill the 120 volts which go to that gas assembly. When working normally the controling thermostat will shut down power to the gas assembly all during the drying cycle.
« Last Edit: September 25, 2008, 04:59:57 PM by JWWebster »
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Offline Repair-man

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Re: No Heat in Dryer
« Reply #4 on: September 25, 2008, 05:48:24 PM »
Quote
IF the vent has a restriction then the FUSE that is mounted on the blower housing next to the controling thermostat will blow and kill the 120 volts which go to that gas assembly

Let's back up a minute JW...

If the fuse on the blower housing is open, the dryer will not run. Only the thermal cutoff, or hi-limit, mounted on the heater flue will stop the ignitor from working.

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Offline JWWebster

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Re: No Heat in Dryer
« Reply #5 on: September 25, 2008, 07:35:22 PM »
I am from Missouri... show me.
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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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Offline RegUS_PatOff

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Re: No Heat in Dryer
« Reply #6 on: September 25, 2008, 08:57:28 PM »
Score (1) for JW  :popcorn:

Electric Dryer has Thermal Fuse in Motor Circuit.
Gas Dryer has Thermal Fuse in Ignitor Circuit.

LGT7646EQ3 Wiring Sheet

« Last Edit: September 25, 2008, 08:59:35 PM by RegUS_PatOff »
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Offline JWWebster

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Re: No Heat in Dryer
« Reply #7 on: September 25, 2008, 09:57:49 PM »
Dangit Reggie ifn you is gonna slap a PDF on me pawease give me fair warning. My PC is lame as hell and I cain't download a pdf without wrecking that freightrainand dammit I am gittin too old to give poop.When this PC die i swear I am outta here. By the way:
 I am the 3rd MoFo that dropeed da bomb on da bomb O0 :2funny:
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Offline Repair-man

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Re: No Heat in Dryer
« Reply #8 on: September 26, 2008, 05:12:25 AM »
Looks like he was right after all.  It's nice to know I'm human and make a mistake once in awhile.  With all the gibberish about marshmellow, I forgot which product we had here.


It sounds to me like JW might have had 'tee many martoonies' on that last post  ;)
« Last Edit: September 26, 2008, 05:56:52 AM by Repair-man »
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Offline RegUS_PatOff

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Re: No Heat in Dryer
« Reply #9 on: September 26, 2008, 12:07:30 PM »
After leaving this Earth, "Do you want the smoking or non-smoking section?"

Offline JWWebster

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Re: No Heat in Dryer
« Reply #10 on: September 26, 2008, 12:38:39 PM »
What do yall mean I am drunk? Yall didn't say that when I came in here 9 hours ago!  8) :o :D ;D :embarassed: ::) :'( :) :2funny: O0
May the hinges of our friendship
        never grow rusty.

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.
I love fan letters! LOL

 

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