My Daewoo KOR-2000 Microwave doesn't heat anymore , can i fix it?

Quite often this is due to a bad door switch located inside behind the area where the door hooks go into the oven.

Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure.

gent165
August 2008

No. Not unless you have been trained to do so - in which case you wouldn't be asking the question. There are numerous possible reasons for an oven "going through the motions" but not heating the food. It is extremely dangerous for an untrained person to try to repair a microwave oven, because it can possibly deliver a lethal electric shock, even after it has been disconnected from the mains.
In your case, there's no danger from microwaves. As it is not heating the food, there are none, but there may still be 4,000 volts at high current.

Jim Garrod
June 2008