Make noise like when some aluminium is inside.

Yep--customer service

try slaming door shut

I would try troubleshooting the "defrost circuit". The behavior sounds like the microwave is cooking in the defrost mode, where it actively cooks then stops allowing the food to rotate and the heat to spread then actively cooking again.

When you hit "Start" to microwave, do the inside light, cooling fan, and turntable all come on?

Any unusual noises? Is it louder or quieter than usual?

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

Post a new help request with the answers to these questions as well as the full model number from the tag on or in the unit.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

Hi.You may try thiis steps.
took the reservoir off,
siphon water from a hose, blow it off
Maybe that is what has happened in
all of these instances
and getting the air bubble out gives us
a full cup of coffee.Hope this helps.

Unplug micro, clean inside with warm water, the seal around door also. Then DRY THOROGHLY, plug in and try your coffee.

There is a main switch on the lower left side, as well as a standby switch on the front. Make sure the main switch is on, and the press the power button on the front. It will warm up & be ready to make a cup of coffee (about 30 sec.) when you select one of the coffee (cup) buttons.

Hi, What you noticed is perfectly normal...
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

It is your cup. The handle density or moisture content of the handle is causing the mwave to heat it. The rest of the cup contains a liquid (coffee?) that is absorbing any heat generated in the body of the cup. Use a different cup!

I don't like to pass on your problem but it sounds very much like either the high voltage supply ot the magnetron has bit the dust.
Either one would make the repair marginal at best.

This is apparently not a very good unit, many microwaves jsut kind of fade away as their magnetron emissions decay.

This one seems to have a bad rep. look at this link:

http://www.fixya.com/search/p489218-ge_xl1800_1100_watts_microwave_oven/not_heat

Sorry, have owned a lemon or two myself.