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Neff microwave h56420sogb. Turns itself off after 22 seconds regardless of what wattage or time is set. How do I fix this?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave shuts off

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

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.

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

Posted on Sep 06, 2008

Master_Tech
  • 770 Answers

SOURCE: microwave turns itself off after a couple of seconds

try to press in on the door after you strat it or down on the door after you start it your interlock switches my be going out

Posted on Jan 24, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave turns off by itself after being on for 3 seconds

See if this describes what's happening:

  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://www.microwavedisplay.com/safety.txt and
http://www.microwavedisplay.com/disassembly.txt

Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

It may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.


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.

In Canada, 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 Mar 06, 2009

  • 1 Answer

SOURCE: microwave turns itself off after a couple of seconds

I HAVE A SYLVANIA MIRCOWAVE THAT THE SCREEN SAYS ROAST ALL THE TIME AND I CANT SET THE CLOCK OR ANYTHING.

Posted on Jul 07, 2009

  • 228 Answers

SOURCE: Neff Microwave H5470SOGB

if appliance runs for approx twenty seconds this is nearly always a magnetron fault usually a cracked magnet or burnt out anode the electronics are detecting an unusual power fluctuation and shutting appliance down for safety you will need service tech to sort.

Posted on Aug 05, 2009

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1 Answer

Oven accidentally operated without any contents and cut out with a smell of burning. Subsequently the oven only runs for approximately 22 seconds before stopping. Any ideas?


It will require a new magnetron and possibly power supply for it. The magnetron will destroy itself if it has nowhere for the energy to go.

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sounds as either inverter or magnetron is faulty difficult to diagnose although when mag fault usually runs for about 22 secs inverter fails sooner around 5 secs.

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Microwave starts as normal but cuts out after


This is happening due to either the magnetron, or the Power Diode, or both, is breaking down, under load, then the unit detects the fault condition, & then, for safety reasons, to avoid a fire or explosion, shuts down the system. You need to take it in to be looked at please obtain a "Quote" before proceeding with any work. This way you can decide to repair or replace.

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Switching off after 23 seconds without heating


Hi Paul, did you get any answer for that?? My neff is giving me same problem.. if you know what is the solution can you please e-mail me to alinaseer1@hotmail.com? Regards

Oct 31, 2009 | Neff H5470 Microwave Oven

1 Answer

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it sound like the inverter unit is faulty or the magnetron is gone.the only real way to find out which is to change each one in turn,sorry i cant be any more help.if you have any more questions get back in touch,regards les

Jul 28, 2009 | Neff Microwave Ovens

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22 years old and you are complaining that it starts andomly, you got way more than your moneys worth for heavens sake loosen up and buy a new one. Help the economy out.

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1 Answer

Neff Microwave H5470SOGB


if appliance runs for approx twenty seconds this is nearly always a magnetron fault usually a cracked magnet or burnt out anode the electronics are detecting an unusual power fluctuation and shutting appliance down for safety you will need service tech to sort.

Jan 05, 2008 | Neff H5470 Microwave Oven

2 Answers

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It would seem there is a bad connection in the fuse holder or in the wall socket or in the microwave itself. Maybe you can narrow it down to the microwave by trying other devices in the wall socket. If it's the microwave, it's time to call for serivce.

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