Oven won't keep heat

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Old 03-03-04, 09:54 AM
blachapelle
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Oven won't keep heat

If I set my oven to 400F, it will only heat up to approx. 300F and then cools off. It will not keep that temperature, but cools off completely. Any idea what's wrong?
 
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Old 03-03-04, 11:12 AM
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Hello blachapelle and Welcome to the Do-It-Yourself Web Site.

Chances are the thermostat has lost the abiltiy to control temperature. Any amount more than 50 degrees off the set temp on the dial or selected temp cannot be fixed. Thermostat replacement is the only option.

If the model has a computer board, the temp is set by a touch pad, the board and or thermostat could be the cause. Replacement of either part is than the only option.

Retail appliance parts dealers can also help determine what the possible problem may be. Bring the make, model and serial numbers. Appliance part stores and dealers are listed in the phone book.

Check back on your question several more times. Other members posting replies in this forum topic may offer you additional advice, ideas, suggestions, test and or repair methods.

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Old 03-03-04, 12:52 PM
blachapelle
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Thanks for your response. I forgot to mention that it is a self-cleaning oven and it stopped working properly after self-cleaning it. Could this possibly point to a problem with the element or do you still think it's a thermostat problem? Thanks in advance.
 
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Old 03-03-04, 01:32 PM
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Hello: blachapelle

Yes! Self cleaning can damage the temperature sensor. And do so in an unconventional thought way. To which some techs and service agents do no agree with.

Self cleaning raises the baking compartment temp to well over the 550 degree max setting. The extremely high temps intent is to incinerate anything left on the ovens panels and plates.

During that process, ash is left. Also, those high temps will over load the senser and cause it to loose some of it's accuracy. The senser is a vapor charged sealed tube.

So as the temp rises, some of the charge can be lost or the charge pushes much to hard on the thermostats internal bellows. To which they do not fully recover from being expanded to much.

The internal bellows of the conventional thermostat wear out like any other moving part. They are very tiny but are true bellows. So the expandable parts do wear out with time and age.

Hope this explains the most likely reason why excessive temps in self cleaning ovens can be damaging to the ovens temp sensing parts, etc. Un conventional thinking and a little unknown conditional fact... that can cause the problem.
 
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