Unlock kitchenaid microwave - KitchenAid KHMS155L Microwave Oven

Yes it should do, but they are very dangerous to work on.

https://www.google.com/search?q=Kitchenaid+microwave+f4+error

https://www.fixya.com/support/r29874712-repairing_microwave_ovens

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Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the previously hidden screw(s) you need to remove.

Or you can watch a YouTube video (not a video I made) that demonstrates how it's done.



In some cases, you then have to gently rotate the handle to unlock it.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

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Try unplugging it, waiting a few minutes, then plugging it back in again. This is easy to try and sometimes works with malfunctioning electronic devices. I've had good results using this technique with my GE microwave and Westinghouse LCD TV to name a few.

Press and hold CANCEL/OFF button until "UNLOCK" appears on display screen.

Touch and hold cancel/off button until unlock appears on the display.

Here you go.

The Child Lock shuts down the control panel pads to prevent
unintended use of the microwave oven.
When the control is locked, only the Vent Fan and Light pads will
function.
To Lock/Unlock Control: The microwave oven and Timer must
be off. Touch and hold START for 5 seconds until 2 tones sound
and a lock icon appears on the display. Repeat to unlock and
remove the lock icon from display.

Your membrane keypad is shorting.

It comes as an assembly, so it's pretty easy to replace yourself. It is part number 4453420 and you can get it here for $235.33 plus shipping.

You can also find helpful exploded views at that link.

The picture below shows you how to unlock a typical membrane keypad connector.



We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Buy a new micro......... the front panel just went bye bye

According to the owner's manual for model KHMS155L:

To Lock/Unlock Control: The microwave oven and Timer must
be off. Touch and hold START for 5 seconds until 2 tones sound and a lock icon appears on the display. Repeat to unlock and remove the lock icon from display.

You can download the manual here:
http://www.kitchenaid.com/custserv/service.jsp

We're happy to help and we appreciate your thoughtful rating of our answer.

Since this was not replied to, I will called it closed.

Please do not rate this unless you still need a solution and will reply back first with the information I requested.