The fan/motor on my Krups Beertender B90 revs up, then stops (repeats). It will not stay on and the indicators on top are not lighting up. Any suggestions?

If the fan in your Amana 10D microwave stays on and doesn't shut off until the unit is unplugged and re-plugged, there could be an issue with the fan motor or the control board. Here are some things to try:
1. Check to make sure the vent is clear and unobstructed. If the vent is blocked, it can cause the fan to stay on.
2. Check the fan motor. The fan motor is responsible for turning the fan on and off. If it is faulty, it can cause the fan to stay on continuously.
3. Check the control board. The control board is responsible for controlling the functions of the microwave, including the fan. If it is faulty, it can cause the fan to stay on or not function properly.
If none of these solutions fix the issue, it is possible that there is a problem with the microwave itself. In this case, it is recommended to contact a professional appliance repair service for further assistance.

I'd look for a defective relay or shorted triac on the control panel circuit board. Either could cause this problem.

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you have a couple bad switches

Some GE units were starting on their own. I would definitely unplug this oven and call GE to make sure yours wasn't one of the ones being re-called.

see this causes and fix it. God bless you
Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.
Exhaust Fan Motor If the microwave is loud when running the fan motor might be
Stirrer Motor If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.
Turntable Motor If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.

The problem is in the door switches, probably one or two need to be replaced.

Inside there's a little door switch there's 3 of them they have to be in sequence You can adjust them with a screwdriver phillips

Hi,

Here is a tip that I wrote about the problem of the cooktop light staying on.

Oven Hot Surface Indicator Light stays on

heatman101

The fan you hear is probably the magnetron cooling fan and that, and the light, are probably both controlled by the electronics board that controls everything else. You might inquire online at Maytag or the Sears parts department to determine the cost of a replacement board but I suspect it will either not be available at all or cost 3/4 of a new microwave.

the door switches need adjusting. remove casing and adjust door switches