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Microwave - fans & turntable not working

I have a Panasonic NN-A574SBBPQ, which suddenly failed with a small 'pop' sound.
Device is just out of warranty, so opened it up and checked fuses ...found 2, both OK. Switched back on and tried a few things;
The control panel/timer, grill & microwave all work OK, but the turntable* & fans are not working.
*n.b. I disconnected the turntable motor, wired up separately and it turned OK.

So, it seems to be a fault with whatever powers these components and theoretically simple to fix, but I don't know which specific part has failed or what it is called, so that I can order & fit a replacement ...Any ideas?

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  • Microwave Ovens Master
  • 8,820 Answers

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

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

Door switch or mount trouble is usually 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 the switch mount is broken, it's usually more economical and safer to add a dab or two of hot glue to the mount to secure the switch. Let it cool for about 30 minutes before using.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

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:.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

If you only need a switch, you can order a universal type here for $5 postpaid.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases in about a week or so.

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

Posted on Feb 15, 2009

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