Question about Microwave Ovens

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Baumatic oven ba896ss

Upon returning from holidays I find there's no power to my oven. There was recently an electrical storm so thinking there may be a reset switch somewhere. I checked the breaker and it's fine although I reset just in case. n All other appliances are ok

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  • Expert
  • 119 Answers

There is a good chance the electric surge has blown the pcb

Posted on Mar 31, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave Panasonic Genius Prestige Model

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

rylee_smith
  • 8619 Answers

SOURCE: Microwave has no power

Hi

If your microwave oven doesn't seem to work at all, check these:
Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.
Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work.


Thanks
Rylee

Posted on Jan 15, 2009

pgh_pa_guy
  • 2992 Answers

SOURCE: Built-in Sharp Carousel II Microwave Convection Oven died.

There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.

Another possibility is that the control circuit board in the oven may have failed. I have worked on several Sharp ovens where the power transformer for the board has gone bad for no good reason. If the board goes bad the oven may appear to be dead as well.

Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.

Hope this has helped a little. Thanks for using Fixya!

Posted on Feb 02, 2010

Testimonial: "Thank you. I will check it out and then decide whether to repair or replace."

  • 72 Answers

SOURCE: My R-1850 stopped cooking suddenly this morning.

you need a new hv capacitor and a fuse

Posted on Feb 04, 2010

  • 119 Answers

SOURCE: No power to Panasonic NN-S252 microwave oven

follow the incoming mains lead into the microwave their is a small pcb with a fuse their check this first

Posted on Feb 20, 2010

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You will need the free Acrobat Reader to view or print it.

Feel free to contact me directly for more information & help.

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

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prototech@usa.net
http://www.microwavedisplay.com

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