Question about Sharp R-1490 Microwave Oven

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Fan runs when door is closed - no heat

Fan begins to run as soon as the door is closed, but microwave oven does not heat anything and turntable does not run, even if it is turned on from the control panel.

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  • John Varine Jun 20, 2007

    I will keep that suggestion in mind.

    Thanks.

  • Anonymous Mar 13, 2014

    micro begins to run when closing door and not setting time

  • Anonymous Mar 16, 2014

    I have a sharp r2130js over the range microwave sometimes when you close the door it runs with light on but not heating when you can use it control panel seems fine

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This is normally 1 of the interlock door micro-switches not working.

Posted on Jun 20, 2007

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6ya6ya

6ya staff

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Hi there,
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Posted on Jan 02, 2017

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Hi, I have an over the range microwave oven that just stopped working. When you close the door it just keeps running and won't shut off. I unplugged it and plugged it back in and checked the breaker.


SOMETIMES A DOOR SWITCH GOES BAD AND BACK FEEDS POWER THAT RUNS THE FAN AND IF IT HAS IT SOMETIMES THE TURNTABLE TOO SO YOU HEAR THE FAN RUN ALL THE TIME BUT TYPICALLY IT IS NOT HEATING. YOU COULD PUT A SMALL CUP OF WATER INSIDE TO SEE IF IT IS HEATING, PROBABLY BAD DOOR SWITCHES OR BAD CONTROLLER.

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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.
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Oct 10, 2012 | GE Microwave Ovens

1 Answer

Mbbs 01 thermador micro oven: timer counts down, lights go on, but no heat, no fan and turntable does not turn. is it a fuse?


Key clue is table does not move---All microwaves with a table have a lever switch that is engaged when door closes--only can get at from inside the unit----it prevents the unit from operation if door not closed.

What happens from closing door a lot is the switch with a lever arm can come loose or even if snapped into a plastic holder break out of the holder.

IF this it is not too expensive a repair.

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Does not heat food-master relay reset, all electric OK (fan runs, time & all other settings show OK, turntable rotates), door closed tightly, control lock


THere are three possibilities, open magnetron "heats food" cracked high voltage diode, or a shorted high voltage capacitor.

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Maytag mmv4205bab continues to run after time is up. The fan does not circulate, but it continues to heat.


Our microwave in office won't shut off. It continues to heat and fan is running as soon as we close the door. Tried everything, unplugged, canceled everything. Please let me know what to do.

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Sharp carousel convection/grill/microwave maybe R990


Hello :

This happens because of a bad door switch . The plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door .

Check also the turntable . It could be out of it's right place .

WARNING :

1:Don't slam your microwave door because this may cause the fuse to blow and this is the reason of bad door switch problem .
2: A microwave is capable of giving you a serious electrical shock even when it's unplugged , so I recommend you to call a repair technician for help .

please don't forget to rate .

good luck .

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1 Answer

Turntable and Fan won't stop running when door is open.


With the model number, we can offer more specific advice or an estimate.

But since FixYa does not notify us of follow-ups, you will need to post a new help request.

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