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Panasonic Dimension 4 microwave model NN-C703BBPQ not working. Display is not illuminated as if fuse has blown. Have changed fuse in plug, but still no visible sign of life. Anything obvious that might need replacing?

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A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

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

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.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

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 (or GFI) 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 it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

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

Posted on Aug 03, 2008

Panasonic Dimension 4 microwave model NN-C703BBPQ not working. The convection oven is working, everything else appears normal except the microwave is not heating food up. Can the magnetron just stop working? Is there a separate internal fuse that can be replaced? Is it worthwhile getting any necessary repairs? Cheers in advance

Posted on Sep 24, 2008

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