What you called the bottom door switch and the main relay lamp relay on the pcb to be closed.
Frigidaire microwave fan runs when door is closed.
No table movement no heat and no counter timing display.
In this case the microwave is indeed stuck in the on position even if nothing is actually being cooked.
The components that could stay on when the door is open but the door switch isn t working are the fan motor stirrer motor and interior light.
The microwave still lights the inside lamp and the fan still blows.
A functioning door switch provides power to other components of the microwave and should interrupt power when the door is open.
It s not actually activating the magnetron as nothing warms up.
I was actually looking for an answer here.
Once the do read more.
My microwave same model after 2 years runs as soon as i close the door intermittently.
The microwave works when cook time is entered but will not shut off until door is opened.
The only way for the fan motor to run is for both the primary interlock switch i e.
Fridgidare microwave fmv152kma fan continues to run when door is shut and cook time is completed.