DOES NOT HEAT

sounds like a bad connection have the teck look for an open ground.

bad ground connection?

sounds like you have your wires crossed

if ventelation fan lts work ok thats mean the problem in hv circuts
you must be have an ohm meter to test
http://031d26d.namesecurehost.com/mwd/kot-150_kot-151_kot-152_kot-155_sm.pdf
read this servis manual its good :)

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

Microwave Oven Basic Troubleshooting Tips

heatman101

do you know basic electronics? or someone who does? if so get back to me and I will help, it is an easy fix.

you may have gotten a power surge and that can cause some funny things to happen, 1st is there power to the oven, 2nd if so there may be an internal fuse protector built in to the oven, check with the manual for anything of that sort listed. if not you may have to take it in and have it repaired by a pro. there is a lot of voltage in these ovens and unless you know what you are doing a person could get hurt

The service manual is here.

Unless there's a bad connection at a magnetron terminal, I would say you have a failing magnetron.

It is part number 2B71165R and you can get it from the Pros here for $68.59 (subject to change).

For more free DIY and other help & advice, feel free to contact me via my site.

William E. Miller, AS-EET
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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.