20 Most Recent Panasonic NN-S254BF Microwave Oven Questions & Answers


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!

Panasonic... | Answered on May 04, 2016


We regret reading about your microwave. At this time we recommend you have the unit evaluated by an authorized service center.

www.panasonic.com/repair

Panasonic... | Answered on May 01, 2014


follow the next steps use the VOM and fix it. God bless you

  1. Main control boardIf your microwave runs for a few seconds and stops, the first thing to check is the main control board to ensure that a shortage has not occurred. If the part is defective then it will need to be replaced to prevent continual shut offs. If this is not the issue, the next step would be to check for a faulty touchpad.
  2. Touchpad/Control panelIf the control board is not the issue and your microwave continues to shut off after running for only a few seconds, the next thing to check is your touchpad, which is also known as a control panel. Although uncommon for this issue, symptoms are usually that the display and some buttons are working properly; however, when selected some buttons are not functioning. If this is the case the touchpad will need to be replaced.
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Panasonic... | Answered on Jun 18, 2013


check this thread ... the answer there worked for me:

http://www.fixya.com/support/t2433472-panasonic_nna554w

Panasonic... | Answered on Mar 26, 2013


It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

YOUR SAFETY IS PARAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.

If it is the type with an "Invertor", they are not user serviceable and must be repaired by an authorised Panasonic agent for continued safety, otherwise if conventional;
Make sure the !!!!any capacitors are discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Panasonic... | Answered on Mar 22, 2011


your fuse went bad replace fuse.

Panasonic... | Answered on Feb 27, 2011


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Panasonic... | Answered on Aug 17, 2010


mcdevito75 here, Sounds like the timer mechanism which is most likely transistor board is wet or shorted, see any appliance repair shop in your area for help.Or Check the owners manual for repairs.

Panasonic... | Answered on Jun 28, 2010


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.


Panasonic... | Answered on Jun 06, 2010


Hello :

This happens because of a bad door switch . The plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door .

Check also the turntable . It could be out of it's right place .

WARNING :

1:Don't slam your microwave door because this may cause the fuse to blow and this is the reason of bad door switch problem .
2: A microwave is capable of giving you a serious electrical shock even when it's unplugged , so I recommend you to call a repair technician for help .

please don't forget to rate .

good luck .

Panasonic... | Answered on Jun 03, 2010


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://207.234.249.73/mwd/safety.txt , http://207.234.249.73/mwd/disassembly.txt and http://207.234.249.73/mwd/doorsw.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.

That 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.

Panasonic... | Answered on May 31, 2010


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

Panasonic... | Answered on Feb 20, 2010


Most likely have blown a fuse , get behind the touchpad to ohm the fuse out , replace if blown , if continues to blow check componets for shorts , there will likely be signs of burnt parts.
Phil

Panasonic... | Answered on Apr 14, 2009


click this link directly to check out the wiring flow char of microwaves .of what goes faulty when there is no power
http://www.applianceaid.com/image/microflowchart.JPG
Most microwaves today have a flame-oven thermostat-safety built into them. This oven thermostat will open up ( no continuity ) when something has been overheated or set on fire in the oven. An example of where the flame-oven thermostat is in an over the range micro, usually the thermostat for the oven is on the top area.The flame-oven sensor-thermostat is suppose to be closed ( full continuity ) all the time and will open up ( no continuity ) when needed, like when something like a small fire in the oven occurs.
A wiring diagram showing where the flame/oven thermostat may be.
A sample picture of a couple different flame/sensor thermostats
Q - My microwave seems to shut off every once in a while, what might be wrong?A - Make sure you hear the fan is still operating in your microwave. Next is to make sure the air intake grill on your microwave is not plugged up with air borne dust and dirt.
Q - My microwave is running and sounds like it is working but will not heat up anything.A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
Q - The microwave display counts down and the inside light is on, but nothing is heating and the fan is not running.A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
Q - My microwave went dead when I opened the door ( same problem as closed the door ).A - This often is a stuck or faulty door switch and it has blown the interior microwave fuse.
Q - My microwave is completely dead.A - House fuse has blown or interior fuse inside the microwave has blown ( usually a part inside the microwave makes this fuse blow ) Sometimes a bad fuse holder inside the microwave cannot hold the fuse tight enough and the fuse will blow as well.
Q - My microwave blows the fuse inside itself as soon as I push the start button.A - Usually a shorted high voltage capacitor...see components section.
THANKS for using fixya.please do rate the solution.

Panasonic... | Answered on Mar 27, 2009


may be magnetron spoiled or high voltage section problem,please check circuit andreplace damage parts...

Panasonic... | Answered on Mar 27, 2009

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