Re. Viking DMOS200 1100 watts microwave oven does not turn on

is it not heating in the bake or microwave mode?

that is usually what internals are cooked,,means

Please check this link and you will get a good idea of how the components works. The front panel can be removed once it is confirmed .

http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html

Mine having same prob but now fan not coming on either

R-820BK/BW Microwave Operation Manual
Due to the risks of death or serious injury the above owners manual suggests that a burnt out light demands a service call by a qualified technician.
That said, if you have a basic level of competence and read the safety hazards involved with microwaves (see a good resource on microwave safety and repair at:
http://www.kellerstudio.de/repairfaq/sam/micfaq.htm
Often, the microwave is divided into two main compartments, the electronics compartment(usually immediately behind the front control panel), and the high voltage compartment(usually behind the electronics compartment). The light bulb is likely in one of these two primary compartments. If it is in the high voltage compartment with the HV Capacitor and magnetron, changing the bulb becomes much more dangerous.
Please be very careful if you do decide to do this on your own... unlike most electronics microwaves can remain lethal, even when unplugged. Hope this helps.

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

Microwave Oven Basic Troubleshooting Tips

heatman101
fjj

First check breaker at breaker panel. Then if you remove the front vent and key pad you will find a paper with breakdown of unit. Look for fuse, check with a tester, if bad replace, if not check all cavity switches, approx 3 or 4, test these. One of these three checks should solve your problem.

Did you ever find out what was wrong? Ours is doing the exact same thing and we have no idea...

Hi the problem will be with the touch panel membrane or the controller. if yoiu can hear a click when the start button is pressed then the touch panel is OK asnd you should look at the controller which can be replaced as a unit or if you are up to it it's probably the main cook relay that has failed.