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the fan may keep running to keep it from overheating until it cools down, if you let it go and it shuts down eventually should be no problem, maybe 3 to 5 minutes it should shut down. fan running is not dangerous however if it never stops then the fan will wear out
All microwaves do have a "transmitter" tube called a magnetron. It has to put electrical power into microwaves. To do so it gets warm or even hot. As soon as the transmitter is to hot, it must be cooled down. Most of the time it can be cooled without a fan. But as long as the thermostat indicates it is to hot, the system will cool. Even when you switched the system off. Don't unplug the microwave when it is still hot. It could damage the magnetron.
Possible that the board is not switching off and so it is better to power off and allow the oven to cool down and then try., If the problem persists then it might be due to fault in the PCB, possible that the drive switch is short or the logic out is on. Need to confirm with a voltage check on the board before the board can be replaced. Take care as the microwave might itself be working!!
Check to see if there's a relay providing power to the fan. If there is, the contacts might be sticking in the closed position. Assuming that this is an over-the-range unit, disconnecting the vent fan completely might not be a good idea as heat/steam from foods cooking on the range would more likely damage the microwave.
Interlock switchIf your
microwave is turning itself on, the first thing to check is the
interlock switch. This is usually the first thing to malfunction that
could cause this issue. If the interlock switch is bad then it will need
to be replaced.
Main control boardIf
your microwave is turning itself on and the interlock switch is still
working, the probable cause is the main control board. If the control
board is defective it will need to be replaced.
In most modern combination microwave ovens, if not all, there is a fan that comes on after use to cool the magnetron and cavity down. This is quite normal but if you still have doubts, contact Kenwood's web site and send them a question. Hope this halps to put your mind at rest.
It is the fan. Im guessing it only happens on combination cook and not when you are only using the microwave setting. It happens because the oven is hot and it helps to cool it quicker. It is normal. The microwaves are not working and neither is the oven-just the fan.