F9 is almost always an error related to a bad door switch or door switch mount or misaligned door hinges.
Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.
Door switchor mount trouble can be caused by slamming the door or by opening thedoor while it's cooking without hitting the Stop pad first.
There areplastic mounts inside the microwave which hold the door switches andonto which the door latches lock when you close the door.
The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.
Sometimes it'sa broken tab on the switch holder, allowing the switch to rotate justout of position. This tab can be hard to see, since it is under thebottom edge of the switch.
One test that sometimes helps is togently lift up (and/or push down) on the door or handle as you try tostart it. If it works or tries to work, then it's a door switch mount ordoor alignment issue.
If you or someone you know decide to lookinto it, we have critical information on safety, disassembly and doorswitches at our site, and our link is at
our listing here on FixYa:.
You can find helpful exploded view diagrams and order parts by entering your full model number
here.
Theremay also be a "mini-manual" hidden inside the unit behind the controlpanel or hidden on the left side behind the grille, which is
very helpful when troubleshooting & testing.
If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.