Question about Sharp R-1490 Microwave Oven

1 Answer

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.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: Fan runs when door is closed - no heat

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

Posted on Jun 20, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

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.

Jun 16, 2012 | Thermador MBBS Microwave Oven

1 Answer

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.

Mar 14, 2012 | Maytag MMV1164WB Microwave Oven

1 Answer

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.

Oct 04, 2010 | Maytag MMV4205 Microwave Oven

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.

May 31, 2010 | GE JE1640 Microwave Oven

1 Answer

Not heating

If the oven is doing everything else properly (light comes on, fan runs, turntable goes around) but there's no heat, you may have a failed magnetron tube (the microwave source). There's also a relay that controls power to the tube that may not be working correctly, or the control circuit board is bad. It's also possible one of the door switches is not working (so the oven thinks the door isn't closed), although this usually keeps the turntable and fan from running.

Microwave oven service is not for do-it-yourselfers. There are potentially deadly voltages present even with power off, and a chance of microwave leakage if repairs aren't done properly. Let a professional give an estimate to repair it, or just replace it if it's under $100. (When I was servicing these things it wasn't unusual for a repair to cost over half the price of a new one. That's one of the reasons so few shops still work on small appliances.)

Jan 31, 2010 | LG MV-1444Y Microwave Oven

1 Answer

Our Microwave keeps running unless we give it a whack!

Hi firstly to see if it is producing energy, buy some 5mm light emitting diodes from an electronics store. cut off the leads close to the plastic body.
place in microwave and put on cook for max 10 secs, if the led's light up you have microwave energy, shut off the oven as soon as they glow otherwise you end up with a mess.
If you have energy then your problem is most probably the door interlock micro switches which after time do not operate properly. let me know the results and we can go further.

Feb 23, 2009 | Danby DMW1153 Microwave Oven

1 Answer

Turntable won't stop

Sounds like a door switch problem or stuck relay contacts on the control PCB. Do the light and fan run too or just the T/T??

Nov 07, 2008 | Jenn-Air JMC9158AA Convection Microwave...

1 Answer

Dacor dcm24s.light, fan, and control panel work but turntable and heat do not

Most likely the bottom door switch. Dacor units are built by Sharp and that switch is a very common problem. You'd either need to check the switch with an ohm meter or remove the cover of the switch to see if it's burned inside.

Oct 20, 2008 | Sharp R-930AK Convection/Microwave Oven

1 Answer

Fan runs when door is closed, but no heat.

It's probably a bad door switch or switch mount. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: Feel free to contact me directly if you have further questions. I appreciate your thoughtful rating of my reply.

Jun 20, 2007 | Sharp R-1490 Microwave Oven

Not finding what you are looking for?
Sharp R-1490 Microwave Oven Logo

Related Topics:

379 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sharp Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

8793 Answers


Level 2 Expert

224 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Sharp Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides