The timer clock has gone off.

If your clock is flashing 12:00 then do this:
Touch the + or - buttons whilst the display is flashing to adjust the time. The display stops flashing after 5 seconds and time is displayed.
To adjust clock time : press mode button 4 times until clock symbol is displayed. Use + or - buttons to adjust time.

If the 000 is on the display left of centre, then you possibly just need to reset the clock. from left to right-....press the first button to activate the clock setting phase....press the next button to pop out the rotating timer adjust and set the time.
If it is the display above the centre control dial pls repost with the full Enr from the rating plate.

If you cannot change it from auto. to manual it doesn't mean you need a new oven. The electronic timer can be by-passed fairly easily by joining the active and oven load wire together..

It looks like the clock is on its way out. I would try two things. First, turn the power off at the main switch, leave it off for a few mins and then turn it back on and see if it makes a difference. You may need to do this a couple of times. Secondly, with the power switched off, repeatedly press all the clock buttons one at a time a number of times - there may be a contact that needs cleaning by operation and then see what happens. if you do need a new clock/timer then ask espares for a quote.

Are you trying to reset the timer or the Clock? It's a bit different on each stove, but usually if it's the clock, you press the Clock button TWICE, the time will then begin to flash on and off. then press the + or - sign to increase or decrease the time. When you have gotten to the time you desire, PRESS the Clock button ONCE more. The time will be set, & then you should be all set :).

If it's the KITCHEN TIMER, Press the Kitchen Timer button ONCE, the timer will start flashing. It will usually flash all 0000's. Press the + sign to add minutes, then Press the Timer Button ONCE again, it will be set to the amount of time you added and will beep once the time runs out.

Disclaimer: This instruction is primarily for the General Electric Stove. If you state your specific model, I could be more specific.

If you look at the timer control you will see a button that is used to set the clock. most likely the oven will not operate until the time is set. Press the clock button, set the time and either press start or the clock button again.

I had exactly the same problem. I followed the directions to reset the clock. That is the cooking button and finish cooking button. They look like a caserole dish and a casserole dish with a cross through it. Hold them down at the same time and the + and - button to advance the time. Be aware I had to try this a few times before it worked. Hope this helps, Dean

It will not work if it is flashing, the timer needs to be reset to manual
If it will not reset, then It sounds like the timer is faulty, try a different combination of buttons when trying to reset it.
Hope this helps.