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This is a code for a bad door lock assembly. Replacing the door lock will fix the problem and the cost is around 112 dollars. The part number is XXXXX There is really no diagnostics needed but if you would like access to the technical manual, here is a link:
Let me know if you have any other questions.
This is the stock answer but I have no reson to believe that it is correct. What part of the door lock assembly would be broken such that I get the F9 error message when I am just using bake. I am not talking about trying to use the clean function. I can force the door lock assembly into the right configuration, or remove it altogether and hard wire to the unlocked config. Select any function bake, convection etc and after about 5 minutes it beeps and F9 returns. It does this with the door switch in either the open or closed position.
I have removed microswitches and have orange hard-wired to violet and grey is just floating.
Anyway i have been at this for many hours now so am going to call it quits for tonight.
If ultimately, it turns out that you are right I will pay up but I have a horrible feeling that it is something more complicated, which is why my original qestion was asking about the specific mechanisim used (presumably by the controller board) to determine the status of the door. I understand that a signal is sent out on the common "orange" to the two micro switches and is detected at some othe point along the way. If the signal is not sent, then clearly it cannot be detected but at the moment I do not have the full story.