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It is normal for the thermal device to turn on and off. Obtaining a steady temp is not always possible. When setting a temperature on some ovens, they have what is called a tolerance point. That means a set temperature has a range of a few degrees up or down. At the Down point, the oven is triggered to energize the coils and bring the interior of the oven back to the settings desired. The other factor is opening the oven and allowing cool air to enter, or in some cases a leaking door seal allows air to enter and heat to escape.
You will need to check the oven calibration using a thermocouple based thermometer(the one you stick in the oven is not reliable). Electric ovens should keep a near constant tempature so if you have it set to 350 the oven should stay around 350 once temp is reached. Now gas ovens are a little different. Most use a on/off thermostat and that means the temp can vary from 320 degrees to 370 degrees to keep an average tempature of 350. So if it is a gas oven you will need to let it warm-up for 10 minutes then start taking the lowest and highest 5 consectutive readings. Then add the 5 reads together and then divide the number by 5 and it should be within 10 degrees of the set tempature. If it is off by more than 50 degrees then you might not be able to get it back to proper calibration. The calibration methods are different for each range and depend on the type of thermostat you have digital(push button controls) or manual(knob). The owner's manual for your range might contain the instructions or consult the manufacture's website for the instructions.
Probably the RTD is going bad. That is a resistive temperature device. It changes resistance over temp and feeds a voltage back to the oven controller telling it that the oven set temp has been reached. If you are not reaching your temperature then I would suspect the RTD.
Are you checking with a store bought thermometer or your recipe. If it is your recipe then ur thermostat might need a calibration or need to be changed completely if it is really off by more than 100 degrees. If it is 99 or less a simple calibration may just do it. If you have a steady hand. With your thermometer inside the oven and the door closed set at 350. Then take the oven knob off and take a small flat screw driver (really small). And insert it in the valve part where the knob was. With a flash light u can see the small screw. Turn it a hair at a time (1-2mm). Wait 20 minutes and see if the temp does rise. If not turn another hair. Repeat until 350 is reached. You must wait the 20-30 minutes for it to reach the temp. If all else fails changing the thermostat would be next. I do not recommend u do this alone. approx cost is: $400 - 500 front access, 500 - 600 rear access Good luck.
If the element glows its ok , if you have replaced the sensor with a new one it can only be the control board. in some cases you can adjust the temp. through the control , it should list directions to do so in the manual. Good luck
how do you know it is dropping 100 degrees ?
If the set temperature is 350-400 the heaters will work untill the thermostat will read that the temperature is reached - after that the heaters will shut down and the temperature will drop...and after few minutes when the temperature goes below thw set point (in this case 350-400) the heaters will turn on again - this will happen for the duration of the timing you have selected (example 45 minutes)
Sears Kenmore Electric Wall OVen, Mod.#9114012192 purchased in 1993. Set oven for 425 degrees, reaches set temperature, stays on about 10 minutes and temp. display goes out and oven starts cooling down. Will not stay on desired temp.to cook. Can you tell me what my problem is? Thanks. Doug.