Door glass The exterior door class on my over the stove microwave has slipped down leaving a gap in the door on the top

There is a small vent hole at the bottom of your oven door that is made to allow you to reach a brush up to clean the glass.. It sounds like your stove seal isn't sealing.

is the lock/screw was loose//?

Has it got wet inside at all? If so it could sort itself out after drying out.
But I would keep leaving the door open as you do, or replace it. Because it is a safety risk, if it came on while empty, after a while it could set fire to itself.

Hi Bill, I am having a same problem I have managed to order the glass from:-

http://www.4neff.co.uk/cgi-bin/product.pl?PID=876912&query=Neff%20H7871N1GB%2f01&model=H7871N1GB&path=127858

1. Open the door.

2. Take out the 2 screws just behind the handle, on the inside of the door, the door should flop down at the handle end.

3. Hold the door handle and pull the door out. It is only housed in by a slip in hooks at the bottom end.

4. Once you remove the door you will see the inner metal mesh and the inner door behind it.

5. Remove the 16 screws holding the inner glass with a special star type screw driver bit no T30.

6. Once you done that the glass housing holding the inner glass can be carefully prised free and taken off the inner door assembley.

7. Once you done that remove and inner glass, and be carefull to leave the glass glass seal intact, clean around the frame housing and the seal then replace the new inner glass and reverse the process.

PS. Becareful of the inner door once you've removed the outer door, as the hinges holding the inner door tend to shut quickly as there is less weight on the hinges.

It will do the job if you follow these instructions.Good Luck. AL

I have a Kenmore with similar issues.
Model 665.61639100
Anyway, good luck with this. Hope someone has an answer for you (and me).
Mine has a open slot on the top front of the door. Kinda like a double plate window execpt for the opening in front. Why is this there? I don't know. Weird design. But it leaves for the possibilty of liquid to splash in there leaving it hard to clean (like impossible).

I'm thinking I have to completely remove and disect the door.

That's a huge gap.

You might ask their customer service people to authorize the replacement of the whole door or the glass and the inner door panel where the gap is.

If they won't help you, you could clean it thoroughly, then carefully caulk the gap with high temperature caulk.

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

We have a stove with no downdraft, and a microwave with a hood above it. It works just fine. I expect you could keep your downdraft and put a microwave without a hood above it, and that would also work. I don't think, however, you can buy an above the range mocrowave oven, that slides in on brackets, which will not have a hood.

What usually happens is there are tabs on one of the inner door panels that holds the glass up.

If one tabs breaks, the other one soon will, then the glass slips down.

If the mesh / screen is still in place and undamaged, and the door is otherwise undamaged, there shouldn't be any leakage.

You or someone you know may be able to take the door apart and use epoxy to fashion new retainers for the glass.

Or you can usually order the specific door panel piece that you need but if you want to, please reply back with your brand and model number so we can help you.

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

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

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

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

First: do not use this unit with the glass improperly installed. Often, these installations use double sided foam tape, available at any hardware store. Carefully remove the screws in the door being careful to catch the glass. Clean the area where the tape will go with glass cleaner or alcohol. Allow to dry and buff to remove oil and grease. Install the tape and glass. Reassemble.

You would probably need a service manual, for which you can contact LG at 1-800-243-0000 or http://us.lgservice.com

Or locate a local servicer:
http://us.lgservice.com/gcsc/b2c/hpi/main

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