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Microwave runs with door open

I have a Sanyo EM-F541WK microwave. It works fine except today it started running again after I opened the door. At least the light, fan, and turntable was on. I tested it with some cold water. It does not appear that the microwave source itself is running, just the turntable, fan and light. The water did not heat up. Any ideas? Thanks

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Re: Microwave runs with door open

I would say you have a failing door switch or the mount which holds your door switch is loose or broken. In most designs, it is the upper door switch that will produce these very symptoms when it is intermittent or its mount is broken or loose. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure. Slamming the door, damage during shipping or transportation and sloppy manufacturing techniques or materials are the primary causes of trouble with the door switch mounts. 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:

Posted on Sep 22, 2007

Re: Microwave runs with door open

I had a similar problem. The safety switch for the door mechanism is the EXACT same one as for _2_ safety switches in the back to disable the microwave when the case is removed. I examined the door switch and after years of use the switch contacts had burned out. Fortunately, I just took one of the 2 safety switches from the back and installed them in the front (they're easy to swap out.) It fit perfectly. I then just connected the wires in the back directly and used shrink-wrap tubing to insulate them. Since I don't run my microwave without a case, this isn't an issue.

Posted on Sep 28, 2008

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Sanyo Microwave EM-S3586WY not functioning need

follow this steps and fix it. God bless you

  1. Inspect the power cordUnplug the power cord and check for voltage at the outlet. Also inspect for damage, shorts, or burn marks that can be a possible safety hazard.
  2. Bad door switchIf your microwave does not work at all and you know everything is plugged in properly and the outlet is functioning, then also check the door hooks and the door release button. Using a volt-ohm meter on RX1, check your terminals. When your microwave door is closed you should have a reading of zero. Once the door is open the reading should change to infinity. If these readings do not match up, replacement of the door switch is necessary.
  3. Blown fusesTo determine if your fuse has blown out, which may attribute to your microwave not running, you need to pull the fuse out using a pair of fuse pullers. Lay it down and using a volt-ohm meter on RX1, check both ends of the fuse in question. If you do not get a reading of zero, then you will need to replace the fuse.
  4. Bad fan motorLocate the fan and remove the leads. Again using the volt-ohm meter on RX1, check the terminals. If an infinity reading is displayed, it means that the fan has gone bad and requires replacement.

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MIcrowave runs with the door open also

your door switch is mis-adjusted,furthermore the other safety switch on the door should have blown the power fuse in the unit,because by design for safety it produces a short circuit if door opens under operation,so if door was taken off and replaced it was not adjusted properly

Aug 15, 2009 | Sanyo EM-P790 Microwave Oven

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Is anything working? Light when you open door? Is your area prone to have Voltage Surges? Did anything else in your home fail at the same time? These may sound like DUMB questions, but they are necessary.
If the light comes on when door is opened then the FUSE is ok. If the light comes on, but nothing else, you have lose a Control Panel. Perhaps from power surges.

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Microwave buttons not responding - microwave running constantly with door shut

It seems the micro switch for the door close have moved from and is not aline the door clip or the micro switch is faulty

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Sanyo EM S8000-w microwave range quit..fuse?

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa:

A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

We're happy to help and we appreciate your thoughtful rating of our answer.

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Microwave runs when door open

This is probably a a bad door switch or door switch mount. Chances are only the fan and light are running when you open it, but better safe than sorry. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure but not the only one. I have a text file called "doorsw.txt" which helps in diagnosing and repairing door switch problems, and a file called "safety.txt" which is of vital importance. You can find these files by searching at (not Google) for this: microwave display safety.txt If you still have a problem, please write back with more detail. Be safe!

Nov 20, 2006 | Sanyo EM-P790 Microwave Oven

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