Not the right temp in the oven 100 degrees off

CALL A LOCAL SERVICE COMPANY GAS PROBLEMS WE DO NOT ANSWER THEY TEND TO BLOW UP

You need to replace the "sensor" in the oven. Here is a link to the part you need.

The thermostat and control will have to be replaced

very normal but only during pre heat / once the oven is stable tempt should be 5 to 10 deg above and below the tempt setting and if not replace the oven temp sensor located inside the oven on the back ..mm

Your GE combo is way overdue for replacement.

Many ranges show a beginning temperature that is higher than actual temperature, then the gap closes as it heats up.
Use a accurate oven thermometer to check your temps.
If it is faulty, it will not recalibrate to offset 200 degrees. You will have to replace the ERC.

You can re-calibrate the oven as follows;
press BAKE pad.
select temp of 500 degress or more.
immediately PRESS and HOLD the BAKE pad until "00" appears.
Then press the + or _ pad to adjust temp up or down 5 degrees at a time.
When fimished press the Clear/Off pad.

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

ive installed 100 new thermostats over the years and they are set from the factory.no adjusting.now some knobs have an adjustment on them.and some times customers got knobs mixed up and got the wrong one one there.

Did you try going to the GE website to pull up the Use and Care Manual? It does have a section re: how to adjust the temperature by as much as 35 degrees either way. Although it is not the 100 degrees you mentioned, you could try it and see if it helps...

The main GE website is: http://www.geappliances.com/

At the top of the web page is a SEARCH section. You can click on the blue down arrow in the first box and select Use & Care Manuals, then put your model number in the empty box to the right of that selection box, ie. JT952 is my oven.

If you are having a problem locating your model number/serial number, you can go to the FAQ (frequently asked questions) section to see how to find it.