Countdown through oven's Power Levels

Judging from the model and without looking it up I expect that unit has an inverter. If it is not the Switches and you have replaced the mag, the inverter is the power supply for the mag to work so either mag not getting power from inverter or inverter not getting signals from main PCB Timer board.

How to fix microwave that counts down but does not heat or ...

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How to fix frigidaire microwave door sensor relay switch. ... with a different part number (D3V-16G-2C25) but it doesn't look like it's stocked. ... Problem now is that when we open the door, themicrowave comes on by itself! ... I am not sure, when you hooked up the volt meter, did the lights turn on and off ...

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i have a nn-h965wfx the light comes on the countdown initiates but nothing comes .....I have a similar full size panasonic inverter microwave NN-L931BF built in ..... After putting it all back together the thing doesn't even power up the display.

Panasonic 1200W 1.2 Cu. Ft. Countertop Microwave Oven ...

www.amazon.com/Panasonic...Microwave.../B005BFZ...

Amazon.com, Inc.Ft. Countertop Microwave Oven with Inverter Technology NN-SN661S Stainless at Amazon.com. ... The microwave panini meals even end up with toasted crisp bread. ...But, right now, I find the interior light functionality just fine. .... (1) In this Panasonic, the light doesn't come on when the door is open; it only comes on when ...

H97, H98 or H99 mean that there's a problem with your inverter, magnetron, or digital programming circuit.

R

It certainly sounds like something is wrong. My first GE microwave was like this and it wasn't advertised as anything special. After a long life I replaced it with a Sharp (makes most all microwaves) and was disappointed at the cycling on and off. Now Panasonic makes what they call Inverter microwaves with continuous power. I recently bought a GE (probably made by Panasonic) with this Inverter technology and am very pleased with it. Make sure the microwave you have says AccuWave on it, if it does, it sounds like the magnetron may have been replaced with a non-continuous type of magnetron. Was it bought refurbished/returned/clearanced? I think when I was researching this that it MAY have something to do with the type of power supply to the magnetron and not so much the magnetron itself.

We recommend you have an authorized service center location replace the light bulb. Authorized service centers can be found in the below link.

www.panasonic.com/repair
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Hello dutch.

This is an excellent microwave, over the range, white only. Here is a link to all of the features, and even the owner manual http://www2.panasonic.com/consumer-electronics/support/Home-Appliances/Microwave-Ovens/Over-the-Range-Microwaves/Technical-Specification/model.NN-S254WF.T#ts
Microwave Type: Over-the-Range Cooking Power: 1200 Watts Capacity: 2 cu. ft. Convection Cook: Without Convection Cook Dimensions Exterior Depth: 15 in. Exterior Height: 9.5 in. Exterior Width: 23.25 in. Miscellaneous Product ID: 22541798 More Information Details: Over the Range Microwave with Panasonic Inverter Technology provides true multiple power levels. When the user asks for 60% power, the oven delivers a true 60% power, not a pulsed delivery of 100% power 60% of the time. This method is called linear power delivery

These early inverter microwaves blew their high current power transistors quite regularly. These high current power transistors are quite expensive to replace, and if one blows, there is a likelyhood of others blowing. As the microwave is over 13 years old, I'd suggest getting a new one. Inverter technology in microwaves is now a mature technology, resulting in reasonable prices and much improved reliability.

Our technician suggest that there may be a problem with the Inverter Board in this model, which is something that would need to be looked at by a Service Center.

In rare cases it could be the door switches.

My panasonic microwave model # NN-S540BFW stops after 4 seconds after you hit the start button and cuts off on its own. What is wrong with my microwave?

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.

Your actual model number is located on a tag around the control panel frame, door or below the cooking cavity.

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