F4 means an open humidity sensor, but sometimes this error is bogus and can be reset by unplugging the oven for a minute or so.
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.
Feel free to contact me
directly (and please remind me of your model number) for more information & 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
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