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Microwave model lmf 1247 ss the reheat reading light stay on and it wom't start

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If you mean the interior light, one of the door interlock switches is out of position or damaged.

If you attempt repair, invest in one of the microwave radiation meters first, because the possiblity of RF leakage is great when you are working on that part of the oven. It is simply a meter you use to check to ensure the door is closing fully and the microwave is not leaking RF into the room when in operation.

You will also likely need a "security" torx bit. the 6 pointed star drive screw has a button in the middle of it to keep people who do not have that correct tool ou8t of the oven.

To locate the defective switch, Unplug microwave and remove cover, and check for continuity of the switch with door closed. If the switch is of a 2 terminal variety, it will only show continuity (or a closed circuit) when the door is either open or closed- but not both on the same terminals. There is often a wiring diagram inside of the microwave, although that is becoming less common with newer ovens. But if yours has one, it will show what they connect to.

On the three terminal switch, it will be open on one set of contacts, and closed on the other, with one terminal being common to both.

If you find one switch that does not function correctly- that is likely the defective switch. If there is no provision for adjustment of location of that switch- and most these days are held in place by molded pins, the switch must be replaced. There will be a number on the side fo the switch, often a long number, will identify the switch. The new one should just snap into place.

If all the door switches checked out, (low probability) the fault will then lie in one of the relays on the control board.and replacing both would be good idea.

If a door switch needs replacement, they snap out- if the plastic retainer breaks, then that piece: if you can locate one; also needs replacement.

If you are as far as having the switch out without damaging anything, the new switch will snap into place, make the connections just as they were from the factory, and put the plastic piece back into place- use the marks that are on it from the original installation to get it in exactly the same place as it was originally. Then reassemble the microwave and test with the RF meter before regular use. If oven has excessive RF, the door must be repositioned as per the instruction sheet inside of microwave. If the reading shows it passes, you put it back where it belongs.

So you can see, the process is mostly labor, but not everyone wants to go to that much work when they are still relatively cheap.

Posted on Feb 07, 2012

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I would suspect a bad door switch or door switch mount.

See the files:
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As long as the oven continues to heat, there may be no other problem. But I suggest you stay near the unit when using it. Watch for smoke and be alert for strange odors. You don't mention the age of your oven but if it is new you can call GE customer care at 800 432 2737.

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