Question about Panasonic NN-S254BF Microwave Oven
My NN-S254 Microwave went completely dead shortly after I replaced the grease filters and added a charcoal filter. While I was wondering what to do next, it came back on and worked for a few hours. It has been doing that now for a couple of weeks. I have noticed that it comes on AFTER we have done some heavy cooking using all the coils on the cooking range below.
Sometime back, I noticed a light brown grease like substance leaking inside the oven, but else it was working very well.
Try cleaning (pull the power cord plug first) the inner side of the sheet metal waveguide which may have a layer of grease that could short out the microwaves. This waveguide runs from the magnetron base over to the cooking cavity and usually can be removed by undoing some sheet metal screws along it's length. There is a fan-like device called a 'stirrer' that is located near the cavity opening under the wave guide and it should be cleaned also along with the cavity entry window. Hope this helps!
Posted on Nov 12, 2009
Sounds like there might be a loose connection somewhere. Both heat and cold cause different metals to expand and contract differently. This could be causing the intermittent problem you're describing. I'd look to see if you may have disturbed some of the wiring when you changed filters. Some ovens (mainly commercial units) have switches that sense when the outside cover is off, or loose. Unlikely to be the problem, but worth looking into.
Posted on May 04, 2016
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Posted on Jan 02, 2017
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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.
At our site, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information.
See our listing here on FixYa: http://tinyurl.com/yzjozk
Oct 21, 2007 | Panasonic NN-S254BF Microwave Oven
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