My new Panasonic microwave will not stop beeping.

https://www.manualslib.com/manual/652153/Panasonic-Dimension4-Nn-C988w.html

FFFF is not mentioned in the user manual, but there may be some helpful information or contact information in it.

PANASONIC Dimension4 NN C988W Operating Manual And Cook Book


This is not certain, but it may be a part that is expensive to replace according to this other web site for a similar model Panasonic oven. That person said their microwave was still working.

https://www.justanswer.com/appliance/6045n-good-day-panasonic-dimension-iii-microwave-convection.html

---------------------------------------------------------------------------------
Good day, I have a Panasonic Dimension III Microwave/Convection Oven 1983
Model NE-9910A.

I went to use it today and when I entered to nuk my coffee a FFFF display appeared where the clock normally appears. I went and found my operating instruction booklet and it indicated to "stop/reset" which I did. Next it indicates to contact a Panasonic Servicecenter. Can you help me out? ps. It still works great!!!!!

Answered in 1 minute
12/24/2011

FFFF means that your display control board has an internal short. The only way to fix the problem is to replace the display control board which is no longer available. If you really wanted to fix the microwave you'd need to remove the display board and mail it to a place like Appliancetimers.com to have the part refurbished. The cost to have the part repaired is usually about $200-250 or so.

---------------------------------------------------------- Good day have Panasonic Dimension III Microwave Convection

Demonstration Mode
This is to enable you to experiment setting various
programs. (The letter D will always appear in the display
window. This is to confirm that there is no microwave
power produced and it is safe to use the oven without
any food). To set Demonstration Mode: press micro
power once, then press Stop/Cancel 4 times. To cancel
Demonstration Mode press Micro power once, then
press Stop/Cancel 4 times.

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 , http://www.microwavedisplay.com/disassembly.txt and http://www.microwavedisplay.com/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 many Panasonic owner's manuals for free download here.

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

If you're not in the US, see Panasonic.net.

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

I took the touch pad control unit apart, clean the connector for the ribbon wire connection between the key pad and the control unit, reseated the ribbon wire in the connection. Everything worked like new.

So we can help you, please post a NEW FixYa inquiry which includes your full model number from the tag on the unit, and the answer to these questions:

Is it dead? (meaning no display, no beeps when you press a pad on the keypad and the inside light does not come on when you open the door)

Is it running but not heating?

Any usual noises?

Does it shut off after a few seconds when you try to cook with it?

Of so, exactly how many seconds?

Are there any error codes on the display?

Also, if you;re not in the US, which country are you in?

Check that particular outlet for a neutral ground

The first thing to try is a "hard reset". Unplug it from the power line for a minute, plug it back in, set the clock, then try again.

Let us know if the hard reset doesn't fix it.

you have a bad inverter board.

In most cases, this is 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. You can find one here:

http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001

We're happy to help and we appreciate your thoughtful rating of our answer.