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Panasonic Microwave Oven Problem Model # NN-H275SF

Hi as soon as I press the start button the microwave goes dead replaced the fuse and the same thing happen again. I hane read in your response that it could be a shorted high volted capictor Question 1 Hao many are there in the microwave & where exactly is it located and finally how easy is it to replace for a do it yourselfer. Thank you in advance.

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Have similar unit here, problem was shorted bridge rectifier on the inverter board. Replacement lasted 2 months then went again, i'm going to try for higher voltage/current rated part this time. It also blew some foil on the board first time, had to repair that with some braided wire.

Posted on Jul 25, 2008

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I do not have service data on this model., but an inverter model will normally have 2 high voltage capacitors located on the inverter board. One or possibly both is likely shorted.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

If you or someone you know wants to look into this, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can get Panasonic parts here: http://www.pasc.panasonic.com/epartr

I would recommend that you contact your nearest Panasonic-authorized servicer. You can find one here.

Posted on Apr 25, 2008

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I see and repair this problem regularly. Details are here.

It's a problem on the control board that occurs when the bulbs short or when they are removed or installed with the power still on.

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Where is the high voltage capacitor at on panasonic microwave model nn-sn960s


behind the control panel,while your checking the h.v. cap check the h.v. diode for a shorted condition as this will also blow the 20 amp fuse too

Jan 06, 2013 | Panasonic NN-H275 Microwave Oven

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MY PANOSONIC INVERTER SHUTS DOWN AFTER 14 SECONDS MODEL # NNCD989S


Check again.

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Order Panasonic parts from Encompass here or you can call them toll-free at 866-779-5835.

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NN-T964SF 1250 Watts Microwave Oven: my microwave went dead and wouldn't turn on at all...


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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...


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.

Jul 29, 2008 | Panasonic Microwave Ovens

1 Answer

Faulty microwave oven


So it's dead? (No lights, no beeps when you press a key?)

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 thermostat to open. When it cools, it closes the circuit and allows power through again.

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

But - this model uses and inverter. Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

I would recommend that you contact your nearest Panasonic-authorized servicer. You can find one here:
http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001

But if you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Nov 08, 2007 | Panasonic NN-S254BF Microwave Oven

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