Buttons do not work - GE Profile JTP18 Electric Single Oven

Try a spray of switch and contact cleaner spray with the power turned off. Get behind the buttons if possible.

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When buttons are not working most of the time it is due to a short in the touch pad or the electronic control in a unit you would have to call for service if you did not know how to use a multimeter to perform ohms and continuity testing and measureing of both pieces. Usually though due to the button not working most of the time it is the touch pad though. If you have any further questions message me back Thanks again
Rick

if the buttons are the touch pads then your control has failed and you will have to replace it .mm

I would Have it Checked. It Sounds like a Transistor or the Circuit Board Needs to be Replaced.

This happened to me on Christmas Day morning & it happened once before. I finally remembered how I fixed it. Push the "Clear" button & then push the "Start" & keep it held in until you see the lock button light up (takes awhile) & then push the "Clear" button again. After I did this the "Clock" worked again - reset the clock to the correct time & push "Start" Then click on "Bake" set your temperature & push "Start". Hope this works for you. It got me out of cooking Christmas Dinner, but I fixed it today!!

Press and hold the clear/reset button for about seconds see what happens.
Regards

My oven's fan is working but no heat what so ever what shall i do

No, it's the first 2 buttons on the left pushed together as well as the + or - to set the right time