Thermador Microwave Oven Model MBBS Serial No FD 8402000337 Runs but no longer heats food. Deep growling sound Light flashes from behind 4.25 x 5.5 " metal plate on right vertical side of oven food space

I just successfully replaced a Thermadore MBBS microwave with an LG Model #LMC2075ST (Lowes stock number 728040). It was close to a perfect fit into the Thermadore trim kit and attachments, and very easy install. The LG was only $169 on sale at Lowes, and is, by far, a superior microwave to the old MBBS model.

just replaced our 6 year old Thermador MBBS ($750) with a GE JES2051SNSS from Home Depot ($179). The bottom guide piece from the Thermador bolted right on the bottom of the GE and positioned the new unit so the front trim piece fit perfectly.

Key clue is table does not move---All microwaves with a table have a lever switch that is engaged when door closes--only can get at from inside the unit----it prevents the unit from operation if door not closed.

What happens from closing door a lot is the switch with a lever arm can come loose or even if snapped into a plastic holder break out of the holder.

IF this it is not too expensive a repair.

The magnetron is most likely the problem, it heats the food and is the heart of the of the microwave oven, if it was followed by unusual odor more noticeable when you open the door that would confirm it, but that is not always the case. The cost to repair would exceed the cost of a new one

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

Microwave Oven Basic Troubleshooting Tips

heatman101

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

The magnetron is most likely the problem, it heats the food and is the heart of the of the microwave oven, if it was followed by unusual odor more noticeable when you open the door that would confirm it, but that is not always the case. The cost to repair would exceed the cost of a new one

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

Sounds like the thermal protector on the mag tube quit. It may have gotten too hot and opened up. That is the lesser of all the evils that can happen to a Microwave.

Quite often this is due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover.

The waveguide cover is usually about the size of a playing card and held in place by a plastic rivet.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.

If the cavity metal of the oven is chipped or charred, it will have to be sanded smmoth and clean.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart or Lowe's.

If your waveguide cover is burned, it will need to be replaced.