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Panasonic microwave nna811a looking for a timer control module or timer control board mine has been burntout. It had a power surge from a 3ph supply one of the ph touched a neutral in the fuse box on wall

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  • Microwave Ovens Master
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Panasonic's UK site is here, and you can use the support links to find spare parts and servicers.

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

Posted on Jan 18, 2009

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No power dead


power outages cause power surges and will damage electronic control boards. I suggest replacing the Control board and checking the interlocking door switches. Whilst inside the microwave check the magnetron for discoloration around the magnetron horn or gun as it were. If it don't look clean and new, otherwise burnt it's bad !

Feb 06, 2014 | Sharp Microwave Ovens

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Panasonic nn-sd277. the only thing that seems to work is the clock and the timer. If you try to get it to work there is snap and it quits. Ours was made in may of 2010 and purchased shortly after that


follow this steps and fix it. God bless you


  1. Controller is confusedA power surge or random non-reproducible action of the universe may have resulted in the controller's program ending up in an infinite loop. Pull the plug for a minute or two to reset it.
  2. Defective Interlock switchesThis can result in the controller thinking the door is open and ignoring you.
  3. CleaningCleaning solutions (spray cleaner) may have gotten inside and shorted out the touchpad or controller. If this happens remove the touchpad, let it air dry for a few days, and then attach it back on the microwave.

Oct 20, 2013 | Panasonic Microwave Ovens

1 Answer

No power to my microwave GE JVM1750DPBB


You're looking $130.49 for the board.

May 01, 2012 | GE Microwave Ovens

1 Answer

No power on microwave panasonic NN-S255


It all depends on your full model number (you left off the suffix) but one version's service manual is here.

In some cases, it is a fuse or thermostat / thermal cutout / TCO, in others a surge has occurred, requiring circuit board repair.

This surge can be from the power line, or due to blown cooktop bulbs.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

You can order Panasonic parts at
Encompass here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Dec 04, 2011 | Panasonic Microwave Ovens

1 Answer

A power surge at the clients house took out surge fuses on some bits of kit. We have repaired them. Now we are left with the bosch micowave with no power. Any suggestions?


If it has an invertor for the HV, return it to a Bosch Agent for repair but if it is a standard transformer, check the transformer supplying the control board.
Hope that helps.

Mar 02, 2011 | Microwave Ovens

1 Answer

No power


Either the fuse inside is blown, or the power supply is shot. You can remove the cover of the oven, and look inside at fuse. You can test power supply / inverter with a voltmeter to see if there is power to the main circuit board.

May 11, 2010 | Panasonic NN-H264 Microwave Oven

1 Answer

We had a pwer surge, all e?ctrocs went ou, all started up with the exception of the Microwave, it 9is Pansonic Combi 18 month old


Chances are the control circuit board on the microwave needs to be repaired. It has built-in surge protection that's usually pretty effective.

I would strongly suggest that you ask if the servicer does "component-level repair" on microwave circuit boards, as opposed to just replacing the whole board. This can save you a good deal of money.

If you cannot find a servicer who does component-level board repair, you can refer the servicer here for instructions.

I'm guessing you're in the UK? If so, you can find a local Panasonic-authorized servicer here.

If you're not in the UK, just visit here, select your region / country on the maps, then click Support and find a link for locating a servicer.

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

Sep 27, 2008 | Panasonic Microwave Ovens

1 Answer

Microwave dead after power surge.


A) The fuse you change was the one on top just behind the control board? correct? Not the one on the door hinge side of the microwave. (as is is the Thermal cutout ) Then most likely took out the control board... i would also check the Capacitor and recifier let me know it this helped?

Aug 14, 2007 | Frigidaire PLMV169DC Microwave Oven

1 Answer

Panasonic NN-S789WC - No power on Display, Fuse OK, bulb Lights


The fuse will be a white or gray ceramic fuse, and you really can't tell if it's blown without actually measuring it. If a new fuse blows when you hit START, you probably have a shorted high voltage capacitor. If you have replaced the fuse and still have no display, then it sounds like there's a problem on the control board. The control board has a built-in surge protector which can short (and smoke) and when it does, it will cut the power to the control board, but not blow the fuse. We repair these nationwide for only $39.95 postpaid. If you or a friend want to check it out or send the control unit in for serivce, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

Mar 02, 2007 | Panasonic NN-S789 Microwave Oven

1 Answer

Power but no display to unit


Not sure about the Neff brand, but in general you'd want to check for 110VAC power on the primary side of the low voltage transformer on the control panel / board. If that is present, check the secondary for voltage, about 12-30VAC. If the unit has a VFD type display, there will be a heater filament supply, usually around 2.5-6VAC. Also look for bad connecitons on the VFD. If those voltages are present, check connections on the board, look for bloated / bulging capacitors, shorted diodes, breaks in the board, etc. Also look for thermal cutouts and thermostats. If this doesn't fix it, can you take several photos of the inner parts and circuit boards?

Sep 26, 2006 | Neff H7871A2GB 800 Watts Convection /...

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