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Microwave Panasonic Genius Prestige Model NN-P794SF No power ! Checked circuit breaker OK switched receptacle still no power

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  • Anonymous Oct 11, 2008

    My microwave (Panasonic genius) just stopped working while in use.
    There is now no power at all.
    The outlets are still working.


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  • Microwave Ovens Master
  • 8,820 Answers

A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or 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 TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

The TCOs you need to be concerned usually with have all black or white wires only. Please reply with photos of your interior if you have questions.

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.

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

You can order Panasonic parts here.

You can find an authorized Panasonic servicer here.

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

Posted on Sep 28, 2008

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Pushing the start button trips the breaker. All functions seems to work, fan, clock etc but it just started as soon as you push start it trips the breaker. Control panel/board seems fine no burn marks.


http://www2.panasonic.com/consumer-electronics/support/Home-Appliances/Microwave-Ovens/Genius/Prestige/model.NN-P295SF
In all likelihood the mangnetron has failed, or perhaps even the Power Supply. or a fault that is shutting the system down for safety reasons You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.
Service manual below, troubleshoot with that. http://www.eserviceinfo.com/downloadsm/5734/PANASONIC_NN-K652.html

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Error code H-98


H95, H97, H98 or H99 mean that there's a problem with your inverter, magnetron, or digital programming circuit.

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

You can find an authorized Panasonic servicer here.

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

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Dec 01, 2008 | Panasonic NN-P794SF Microwave Oven

3 Answers

Microwave oven


Check the wall AC outlet by using a meter or another electrical appliance such as a table lamp. If no power there replace the fuse or reset the circuit breaker.

Does your microwave light up when you open the door?

If not, it could be a bad power cord, on/off switch AC cord or fuse.

Check these first.

If you cannot solve the problem, you'll probably need service.

Hope this helped.

Mar 25, 2008 | Panasonic NN-P794SF Microwave Oven

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