Not sure which model my oven its but it takes a long time to preheat then does get warm enough. I put an oven thermometer in it and if you set it for 400 it beeps that it is up to temperature at 300 then climbs later to about 350. The top element gets red hot when you put broil on and the bottom gets red for oven temp so I am thinking that the elements are not burnt out. Any ideas what it could be

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.

First of all, most oven thermometers move very slowly compared to the electronic sensors and controls on the oven. To make sure you are getting an accurate reading, the thermometer should be in the center of the oven, the oven should be preheated, then wait another 20 minutes after the preheat beep. If the temperature is less than 35 degrees higher or lower at this point, it can be adjusted via the controls. Usually on GE ovens you press and hold bake and broil at the same time until SF comes up in the display. Then press bake, then use the arrow keys to raise or lower the temperature setting. If the temperature is more than 35 degrees off, you may have a bad sensor, bad control board, or other problem.

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if the oven has a glow bar it,s not staying hot enough to keep the main burner on change the glow bar

Depending upon your make and model of oven when you first turn the oven on to heat a light may come on that says 'preheat'. When the oven is heated to the temperature that you set it for the light will go off and some models sound a tone or beep as well. If your model does not show you in any way when it is preheated ( such may be the case in an older oven)you can purchase an oven thermometer for that purpose. If you will send the information regarding the make and model of your oven, I can give you a more specific answer.
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it will either be the sensor or the board,hopefully it's not the board,the part number for the sensor is 4455636 and subs to w10131825,the sensor is around 100 bucks,there should be a tech sheet on the machine most likely behind the touch pad on the top,it will tell you how to check the sensor with a meter,just unplug the sensor and read it out i think it's around 1100 ohms but check that on the tech sheet,if it's not the sensor most likely it will be the board part number 4453661 and that's around 300 buckseverything runs through this computer board but the sensor tells it how hot it is in the oven hopefully you have a bad sensor.let me know what you find,you'll most likely have to pull the oven to repair it but maybe just enough to get the top open,good luck

Hi,
Check out this tip that I wrote about this problem...

http://www.fixya.com/support/r4511800-oven_problems_electric_oven_heating

heatman101

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.

What are using to measure temp ? Are you using a grocery store bi-metal or professional thermal probe ? and further to that, how long are you waiting to check temp. after range "beeps" or announces preheat complete ? The bi-metal type thermometers do take several minutes longer to reach actual temp as opposed to the ranges temp. probe. Does this unit have the "hidden" bake element ? That sounds like a huge temp difference. These units do require an additional 10mins of wait time after announcing ("BEEP") the preheat is complete (check your manual, it should confirm this) Elements don't go "bad" it either comes on (amp draw) or it doesn't.

hope this helps.

good luck

You may not need anything. Most people test their oven with a dial type oven thermometer. They are slow to react and often not very accurate. When I test an oven or install a new thermostat, I use a digital thermometer with a remote temperature probe, hanging from the center of the oven, which shows the temp in tenths of a degree. I let the oven cycle on and off at least three times, then take the high and lower readings on the next cycle and average that out to see what the actual oven temp is. Most of the time, if there is a dial type thermometer in the oven it is very slow to react. After 3 to 5 cycles, they often show close to what the actual oven temp is, but the only way to know for sure is to use the more accurate digital thermometer. Most ranges with digital displays can be adjusted + or - about 35 degrees. Check your users manual for this info, but don't mess with it until you have checked the oven with a digital thermometer! Please don't bother rating this solution, as anything but a Fix-Ya drops my score. Thanks.

hummmm this sounds similar to what is happening to me. I am praying someone will have a solution, I don't want to have to explain to my daughter who is going to be 4 tomorrow, why I can't bake her cake.