The control board has failed due rust.
SOURCE: LG microwave no longer heats!
It sounds as though you may have run the microwave while empty, which can damage the magnetron.
Not that I'm optimistic, but the first thing to try is a "hard reset". Unplug it from the power line for a few minutes, plug it back in, set the clock, then try again.
Let us know if the hard reset doesn't fix it.
Otherwise it likely needs a new magnetron.
SOURCE: Microwave will not turn off
This is usually caused by either a bad door switch, a loose door switch mount, or occasionally a problem on the control panel.
Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.
Door
switch or mount trouble can be caused by slamming the door or by
opening the door while it's cooking without hitting the Stop pad first.
There
are plastic mounts inside the microwave which hold the door switches
and onto 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's a broken tab on the switch holder, allowing the switch to rotate
just out of position. Other times, it's a broken tab on the switch
holder, allowing the switch to rotate just out of position. This tab
can be hard to see, since it is under the bottom edge of the switch.
One test that sometimes helps is to gently lift up (and/or push down) on the door or
handle as you try to start it. If it works or tries to work, then it's
a door switch mount or door alignment issue.
If
you or someone you know decide to look into it, we have critical
information on safety, disassembly and door switches at our site, and
our link is at our listing here on FixYa:.
You can probably find exploded views and order parts by entering your model number here at the Sears parts site.
There may also
be a "mini-manual" hidden inside the unit behind the control panel 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 and we'd appreciate your
thoughtful rating of our answer.
SOURCE: cookworks microwave not heating up
Since
it's less than one year old, it should be fully covered under warranty.
I'd suggest contacting the manufacturer to get it fixed free.
If
for some reason you don't have your owner's manual, I would suggest
calling the dealer where you bought it to see if they have a number for Cookworks.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
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