SOURCE: LG microwave oven
It's usually a bad door switch or a broken door switch mount. Once in a while it's due to a board problem. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
SOURCE: Sensor touch to microwave oven
Sounds like a bad keypad.
For parts see: https://www.mcappliance.com/orderparts.aspx
For support help:
http://www.mcappliance.com/contactus/contactus.asp
SOURCE: Microwave stopped working for no reason
A microwave can be dead for many reasons.
It
may be the fuse, which is usually located behind the grille or on the
floor of the oven behind the control panel or between the door switches.
If
the fuse is good, it may be an open thermostat or thermal cutout (TCO)
/ thermal fuse on or near the magnetron or on top of the cavity / body
of the oven.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If
it goes dead or blows the breaker (or GFI) when you plug it in or open or close
the door, then there's a problem with a door switch or door switch
mount.
At
our site, we have a video available showing how to remove a typical
over the range control panel assembly in under 5 minutes.
You can usually find helpful exploded view diagrams and order parts by entering your full model number here.
There
should also be a "mini-manual" (tech sheet) hidden inside the unit behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating components.
If you don't find your tech sheet, you can download it here.
If the cavity thermostat needs to be checked or replaced you'll need to pull the oven from the wall.
You can download Whirlpool owner's manuals and installation instructions here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: Microwave is locked. It says "Keypad touch locked"
Hold lock button for a few seconds and it should return to normal
SOURCE: LG Microwave MH-685HD Owner's Manual
Try this website: http://www.service-manual-owner.com/lg.html You may have to email the person to get the manual?
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