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Panasonic S943 microwave activates when door is opened. Light, Fan, and Turntable all come on when door is opened. Still cooks normally when door is closed.

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I had exactly the same problem with Panasonic NN-S962. I found very useful technical guide on the following website: http://www.eletrodomesticosforum.com/es/cursos/horno_microondas/Inverter.pdf
In the troubleshooting table on pages 31-32 it correctly states that this problem is caused by shorted primary switch. The technical guide has diagrams and photos helping with locating primary switch. I ordered a replacement switch from Sears PartsDirect (part no.46-692286-3). However, it is a common Omron switch V-15G-3C25 or its replacement with 16A analog sold by Sears PartsDirect that may be purchased cheaper elsewhere. After I replaced the switch my microwave started working normally. It was the easiest fix ever. Took me more time to research the problem and find the right part than actually fix it. That's why I decided to post this solution to save time for those who experience similar problems (looks like a fairly common problem for Panasonic microwave ovens).

Posted on Jan 29, 2011

  • dmarie Nov 30, 2011

    also finding same to be true--with Sharp Carousel

  • Dizpo Zabl
    Dizpo Zabl Apr 13, 2014

    Found local substitute: Honeywell High-Force Pin Plunger 15A V71C17D8 (V33001D8) - $4.10

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No! this is not normal, the light should only come on when it is cooking, the cause may be a defective door switch, the oven would need to be dis-assembled to test all the switches to find the faulty one.

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This is usually caused by either a bad door switch, a loose door switch mount (which are pretty simple problems to fix) or occasionally a problem on the control panel.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

You can order Panasonic parts from Tritronics but if you only need a switch, you can order one from us for $5 postpaid.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Microwave turns on when door is open slightly


It's due to the timing of the opening of the door switches.

It's normal in most cases, and it is not cooking.

Normally it's just the light, fan, and/or turntable that come on.

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

Apr 28, 2008 | Kenmore 62109 Microwave Oven

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Do not run the microwave with the door open. You will be cooked. Sooner or later, if there are enough microwave ovens, (and there are), everything that can go wrong with them will, eventually. There are several interlocking safety systems built into every microwave so that they won't work with the door open. Yours may have failed. I've never come across one, but that doesn't mean it can't happen.
It may only have a fault making the fan and turntable operate, which can sound like it's working with the door open. Either way, get it checked or get a new one.
This assumes that the microwave isn't actually supposed to do what it is doing under normal conditions or current programming. Refer to manual/instructions if unsure.:::Spiceweasel.au

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This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

Switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

If you think the problem is on the control panel, which we repair these nationwide for $39.95 postpaid.

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

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What's happening is you are activating one door switch a little before the other, and that is causing your light, fan, and turntable to come on. The plastic parts are not perfectly rigid, so they flex a little when you press the button, and that causes the lag to be more apparent. Even if you press the door open faster and look really close, you may notice the light, fan, and turntable coming on for a split second. That's perfectly normal. The relay on the control board must also be turned on before it will actually be cooking.

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