I set the oven for 350 and after 5 mins the preheat beeper goes off. The temp. in the oven though is only 200. After about a total of 20 mins of being on the oven will read and maintain a temp of 350. Is this a sign the thermostat is on its way out?
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If oven is electric pleace check that the heating elements are ok, could be that only one or two elements could be the only heaters hence luck power to maintain temparature when open or gets too slow to preheat.
More than likely, its your oven thermometer thats taking a half hour to read correctly. The oven is probably getting there sooner. If you had a digital thermometer, the read would come quicker. So save your money,nothing wrong with your stove.
you may want to check your broil element
turn the unit on and wait a few minutes
see if you can feel the heat from the upper broiler elemnet
some model use both elements to preheat
i dont have your productiuon number so i cannot be sure with your model
14-20 mins is the industry standard for a 350 preheat...
The oven was obviously not heated to 350 even though this was the setting. There is a very simple proceedure to calibrate the oven. It is different on different makes of ovens. Your owners manual will give you the detail of how to reset yours. If the manual is not available, click on the following link. Hope this is helpful.
click the link
Oven temp sensors sense the temperature is the oven cavity and the temp sensor changes resistance, this change in ohm resistance tells the oven control what temperature the oven cavity at and tells the control to shut off the element or turn it back on. The most common temp sensors used today ( *not all ) are approx 1000-1100 ohm resistance at room temperature ( 70�F ) Some ohm readings and there temperature: Degrees F - Resistance 100 - 1143 ohms 200 - 1350 ohms 300 - 1553 ohms 350 - 1654 ohms 400 - 1753 ohms 500 - 1949 ohms
Try to set it at 500 degrees and see if it goes off at 350. If it does, then it probably needs calibrating. You can calibrate it by taking the knob off and finding a set screw in the stem where the knob sits. If this is not the problem, you may have to replace the thermostat. By the way, check to see if your temperature probe is not touching the wall of the oven. It will give it a false reading. Let me know if any of these things work and we will go from there.