My Whirlpool oven model gbs307 shuts itself off during the baking mode. the display shows E 1, F 2. The oven will not run for more than 5 minutes at a time.

From a google search the following is copied:

LOC is a control panel lock not a door lock, see below.

The Control Lock shuts down the control panel pads to prevent
unintended use of the ovens.
When the control is locked, only the CLOCK, TIMER SET and
TIMER OFF pads will function.
The Control Lock is preset unlocked, but can be locked.
To Lock/Unlock Control: Before locking, make sure the ovens,
Timer and Timed Cooking are off. Press and hold START/ENTER
until a single tone sounds and "Loc," a picture of a lock and
"START?" will appear on the oven display, about 5 seconds.
Repeat to unlock and remove "Loc" from display.

If the above does not work have you tried removing power from the uit for a few minutes to see if it will reset.
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http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/499415-whirlpool-double-oven-shows-loc-display.html

Likely you need a thermal cutoff replaced near where your heating elements are. It senses the fault and shuts down. You can but an after market thermal cutoff from most any electronic parts supply, and maybe even from an appliance parts supply.

To Set a Cook T ime:
1. On double oven models only, press UPPER OVEN or LOWER
OVEN for the one you want to set.
2. Press BAKE or CONVECT UPPER (on some models).
Press the number pads to enter a temperature other than the
one displayed.
3. Press COOK TIME.
4. Press the HR and MIN "up" or "down" arrow pads to enter
the length of time to cook.
5. Press START/ENTER.
The start time and stop time countdown will appear on the
oven display.
On double oven models only, when both upper and lower
ovens are being used at the same time, touch UPPER OVEN
or LOWER OVEN to display the respective cook time.
When the stop time is reached, the oven will shut off
automatically and "End" will appear on the oven display.
If enabled, end-of-cycle tones will sound, then reminder
tones will sound every minute.
Repeat the process by choosing the other option of UPPER or LOWER OVEN

Same problem here on JKP15WOW1WW. The cycle starts like this:
1) Open circuit Breaker
2) Open oven panel and push ribbon connector to ERC. Replace planel.
3) Close circuit breaker
4) Run to oven, notice clock flashing some time but not 12:00 and start Bake. Bake button beeps and starts bake coil.
5) Within 5 minutes hear a beep and all buttons on panel are unresponsive. Bake continues. if oven light is on it continues to glow. Only button that responds with a beep (and not to clear bake or oven light) is Clear botton.
Rinse..wash..lather...repeat...

change temp control

Call GE answer center 1-800-626-2000 ask for tech help, Have you Model # off you data plate ready.

Press and hold BAKE pad for five (5) seconds. Current offset, if any is shown in 3-digit display. CAL is shown in 4-digit display (3 digits on right).

Pressing the UP pad adjust the temperature in 10 degree F increments in fthe following sequence: 0, 10,20,30,-30,-20,-10, 0 and so on.

Press START/ENTER pad to activate the desire tempature adjustment. If the START/ENTER pad is not pressed within 5 minutes, adjustment is ignored.

It has been a while since he was there. Did you have to replace a board? Hopefully, it is fixed.

I need to bake in my oven how can I find the button to set the temp to bak?

The control is automatically set to turn off the oven after 12 hours baking or 3 hours broiling should you forget and leave the oven on. If you want to remvoe this feature do the following steps: 1. Press and hold, at the same time, the BAKE and BROIL buttons for 3 seconds, until the display shows "SF". 2. Press the DELAY START TIME button. The display shows "12Shdn" for 12 hour shut off. Press the DELAY START TIME button again. The display will show "no Shdn" for no shut off. 3. Press the START button.