What error message is it showing? What is your model?
F3 on a GE / Hotpoint microwave means you have a shorted keypad.
If you (or someone you know) might want to replace it yourself, I have uploaded a
handy guide with pictures showing you what's typically involved.
You can usually find helpful exploded view diagrams and order parts by entering your full model number
here.
There
should also be a "mini-manual" hidden inside the unit behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting & testing.
If you would like to have us do this for you, we do that for $39.95 plus part costs.
Please feel free to contact me directly if you need more help.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.William E. Miller
[email protected]http://www.microwavedisplay.com