Claibrating the temperature of a GE gas oven

Hi.

The JBP78 is electric, since you are talking about a gas oven I think the model is incorrect.

Talking about a gas ovens:

If the oven is not heating up and both broiling and baking burners are working and coming up then check the temperature probe sensor and the control board.

If one of the two burners is not firing check the ignitor, the burner and coil, the burner and flame sensor. The most common problems come from defective ignitor.

Regards.

Ginko

I believe that you have a convection oven.... by design, convection ovens built by GE come up to temperature....at 25 degrees below the set level .... when the Convection function is enabled.

you need to calibrate the oven.

go to this web site

http://genet.geappliances.com/geasearch/Dispatcher?REQUEST=GETSEARCHRESULT

the second in the list is your solution

I assume you mean converted.  Changing the gas supply from natural to LP or vice versa should not change the temperature calibration settings. Most manuals have a compensation method for their units within them, should you suspect your temperature dial is out of range.  Get a small oven thermometer, put it in the oven, run at a known setting...say 350 and read what the gauge says after 15 minutes.
Your manual can be found on the GE site under http://www.geappliances.com/service_and_support/literature/ 

If this is a newer range, the instructions to recalibrate should be in the manual that came with the stove

bad oven sensor

Have you tried replacing the bake ignitor yet?

First of all, do not use the oven thermometers from a grocery store. they can be off by 20 degrees or more. These directions may help you for electronically controlled ovens. The older manually controlled ovens have a small screw head in the center of the oven temperature knob that can be adjusted in usually 10 degree increments.


To Adjust the Thermostat
Touch the Bake and Broil Hi/Lo pads
at the same time for 3 seconds until the
display shows SF.
Touch the Bake pad. A two digit number
shows in the display.
Touch Bake once to decrease (-)
the oven temperature, or twice to
increase (+).
The oven temperature can be adjusted
up as much as 35°F. or down as much
as 35°F. Touch the number pads the
same way you read them. For example,
to change the oven temperature 15°F,
touch 1 and 5.
When you have made the adjustment,
touch the Start pad to go back to the
time of day display. Use your oven as
you would normally.
NOTE: The thermostat adjustment for Baking
will also affect Convection Baking or Convection Roasting.

If you can smell the gas when you turn on the oven, it may be on a separate igniter that has gone bad. I would check this first. If you are not getting gas to the oven, there is possibly an issue with the supply line.

the oven needs a new ignitor more than likely