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On the low setting, the dryer heats up to over 200 deg F. All the thermostats show 0 resistance at

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  #1 (permalink)  
Old 04-12-2012, 01:32 PM
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Default Too hot
Model Number: teds840jq   Brand: Whirlpool   Age: 5 - 10 years   

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On the low setting, the dryer heats up to over 200 deg F. All the thermostats show 0 resistance at room temperature. The heating element doesn't seem to be grounded. Is it the controls? Thanks.


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  #2 (permalink)  
Old 04-13-2012, 03:25 AM
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Here are your parts
Replacement parts for TEDS840JQ models | AppliancePartsPros.com

See the attachment for the tech sheet.
The last digit on the model number was missing so I used a JQ1.

You said "doesn't seem to be grounded", I am going to assume that you checked the heater resistance and for grounding with a meter and everything read normal.

My fist guess would be that the operating thermostat's contacts are welded together. You could check this by heating up the face of the thermostat to see if the contacts will open. I use my soldering gun but you could also do it on a stove element. Just be careful that you do not burn yourself. If they do not open then you know for sure that it needs replacing.
Also note which wires go where when removing the thermostat as it is a 4 wire (2 for the contacts and 2 for the internal heater).

If it does open it does not eliminate tthe thermostat as it may open at too high of a temperature.
Attached Images
File Type: pdf TEDS840.pdf (190.2 KB, 5 views)
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Old 04-13-2012, 08:20 AM
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Default too hot

Thanks for the advice. The thermostat does open up but at too high a temperature--I hear a click and the heating element goes dim. Is that because the high limit is switching it off? I'll check the operating thermostat. Can I simply heat it up with the dryer, and then unplug the drier and test it while still hot? Thanks again--MJK
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Old 04-13-2012, 09:48 AM
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Is that because the high limit is switching it off?
That is what I think is happening.

Can I simply heat it up with the dryer, and then unplug the drier and test it while still hot?
I do not think so, it will probably cool down too quick.
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Old 04-17-2012, 05:43 AM
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Default drier too hot

At this point I have replaced all 3 thermostats. Still the drier gets way too hot. The coil glows for about 5 minutes before shutting off on the low setting. The temperature inside the drier exceeds 200 deg F.--Thanks---MJK
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Old 04-17-2012, 06:49 AM
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Check all the seals in the unit.
The house air is being sucked through the drum etc. so is under a vacuum. If there is an air leak it will suck in room air and so the thermostat on the blower sees a cooler temperature and keeps the heater on too long.

I am starting to grasp at straws here.

Recheck that the heater is not grounded.
Unplug the unit and both wires to the coil.
Check it with a meter, should be around 10 to 12 ohms.
Then check from each side of the coil to the case/frame, both should be infinite ohms (open). If not the coil may have sagged or broken and is touching the case.
I doubt this is the problem but is another straw.

Did this dryer ever work OK for you.
Every once in a while I go in circles, only to find out that the dryer is new to the poster and the old owner messed with the wiring and that is the cause of the problem. Just want to be sure!!

Unplug the unit and disconnect it from the vent system.
Now try a run.
If it now dries OK odds are the vent system needs checking/cleaning.
Be sure to check that the louvers on the outside of the house open correctly.

If you do not want any lint in the house.
Take a pair of pantyhose.
Put one leg into the other and then attach this to the dryer's vent.
Leave enough room so the pantyhose can balloon out like a windsock.

Both the above will let you check the temperature and the air flow.

You could check the exhaust temperature.
On high heat the thermostat opens at 155 degrees F and closes at 130 so your exhaust temperature should cycle at approximately these temperatures.

Check that the lint filter and the holes where the heat /air enters the drum are clean.Sometimes fabric softener residue can coat these and cause problems.
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Old 04-27-2012, 09:15 AM
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Default Dryer too Hot

Sorry it has taken so long. The dryer is about 9 years old and has worked fine until recently. I have tested it with out exhaust pipe connected and without clothes in it with a meat thermometer taped to inside of door. It always goes up past 200 degrees on the low setting--Clothes have been shrunk. It definitely does turn off the heating coils--just not soon enough. I will retest the coils in the manner that you reccomended and inspect the seals. I did take the whole dryer apart to replace the drum seal and clean everything but it worked fine for about a month after that. I really appreciate your help. Thanks--MJK
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