Question about Microwave Ovens
Won't heat up and F3H comes on
F3H means you have a failing humidity sensor, but the
first thing I would suggest is a hard reset. Unplug the unit for a
minute or so. Then plug it back in, set the clock and try again.
If that doesn't work, leave it unplugged for about 5 minutes. Then let us know if the hard reset does not fix it.
There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.
At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.
If you don't find yours, or if you want to look at it without disassembling the oven, you can usually download it here.
You can usually find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on May 20, 2009
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Posted on Jan 02, 2017
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