When I set temperature to preheat at 350, it beeps when temp reads 250. WHAT IS PROBLEM?

Hello, Cristina -

Since you have not stated the make and model of your oven, all I can advise is for you to turn your oven on and set it to the desired temperature and wait for 10 - 15 minutes until the oven comes up to the full heat temperature.

You can read the instructions here, if you wish:
https://www.wikihow.com/Preheat-an-Oven

Best wishes.

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.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/jeffrey_634abadf963e31e5

Please double check that model number. That number is coming up as a refrigerator.

more than likely there is an issue with one of the temp sensors. you will need to press and hold clear then upper on off at the same time then release them then immed. press clear 3 times and hold on the 3rd till the service screen appears. on the right side you will see internal temp and catalyst temp they should be equal or very close. ill bet one of them is alot higher than the other if so the sensor will need replace but depends which one is bad as there are 2 of them. if the problem is on the lower just repeat above but use lower instead of upper

Always preheat your oven and let it cycle at least 2 times. Your unit may show 350 but the manufactures know that it is not 350. When it registers preheated, it really means that it is at an acceptable temperature to start cooking. If you think that it may not be calibrated correctly, your owner's manual will have instructions on how to recalibrate your oven. You will be able to raise or lower the temperature by + 25 degrees or - 25 degrees. As far as the gas smell, you will from time to time smell a gas smell with a gas oven especially if you are right at it when it ignites. If you are smelling gas when it is not in use then you should be extremely concerned.

http://www.applianceaid.com/nuker.html
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


click this link
http://www.applianceaid.com/elecrange.html

sounds like a bad bake ignitor(uneven heat,long cook times, long preheat times, perhaps even gas smell while cooking)

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.

It's working ok. These often beep after a preset time. It may be set to beep at 10 minutes. Not always at the temp set. It is usually close enough though.