See this causes and fix it. God bless you
Lights come on, but can not program unit, Touchpad dead If
you have a stuck key or non-responsive key, most of the time you will
have to replace the keypad for this microwave oven repair. If your
keypad is connected to your control board by a flat ribbon wire, try
disconnecting it and clean the silver contacts with an ordinary pencil
eraser. After cleaning, plug it back in and try it. If it doesn't fix
it, replace the keypad unit. Some units actually have keypad tests to
confirm your diagnosis of a bad key.
If your keypad and control is
the same unit, replace that unit. Another note, unlike stove/oven
keypads and controls, most microwaves do not have error codes or tests
to distinguish whether it is truely the keypad or control. Most of the
time, it is the keypad that needs replacing, but a small percentage of
the time it can be the control. Check the tech sheet if they can point
you to the right part.
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