Question about Panasonic NN-T694SF Microwave Oven

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Powers up but does not START cooking = Displays colon after you press START

HELP! I am having an issue with my Panasonic Inverter microwave. When you select a cook time then the START button it goes back to the colon. The colon is not blinking. It doesn't allow us to set the time either. When you plug it in it reads: "Welcome to Panasonic, REFER TO OPERATING INSTRUCTIONS BEFORE USE." It allows us to key in the time and all the other buttons appear to work, but as soon as you press the START key, it reverts back to the colon. Also, I tried press the Function Key (You can select 0 to 9 to select a function.) and the only one it allows me to select is the 0 - which is used for DEMO. It allowed me to turn off the DEMO. So the DEMO is set to OFF. Any suggestions? It's a pretty new microwave. It would be a shame to just toss it. :( Any suggestions would be greatly appreciated! Thanks in advance for you help! Kind Regards, zabamed ps. The only thing I have tried to do is disconnect it. Does anyone know how to reset the microwave? Maybe it needs to be RESET to it's original configuration?

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  • Zab Med Jan 02, 2007

    Thanks for your suggestion! I believe it was the circuit board and possibly the number pad. This weekend we opened up the puppy and cleaned-up the number pad and the circuit board with some q-tips dipped in alcohol. It works fine now! (I admit...not all the alcohol made it on to the circuit board ;)

    Thanks for responding!
    zabamed

    For future reference:
    The buttons did appear to function properly, since it would allow me to select any time, but when I pressed START it didn't start cooking.

  • Anonymous Mar 30, 2014

    living in a motel for next 3 months and need this thing to work or replace.

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I would check your onwer's manual for any other specific reset instructions. Generally it reset by unplugging it from the wall for a few minutes. Does the microwave require you to set the time and date before it will work? Are all the keys on the keypad working or do they seem to? If not, you may have a bad, damp, or corroded keypad or control circuit board. I can follow up more on these if it seems like your problem. Please met me know what you find.

Posted on Jan 02, 2007

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Posted on Jan 02, 2017

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Hi, i have a panasonic inverter microwave, but stop working properly.It has power when plug-in, all function buttons are working but when it comes in microwaving, its stop automatically after 7 second


That would be an inverter issue. Here's my overview of Panasonic microwave faults:
Diagnosing Panasonic microwave oven stoppages:

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter, controller, magnetron, or a bad connection from one or the other.
If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

If it stops after 7 seconds, it has a problem with the inverter.
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.

Or 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.microwavecontrol.com/safety.htm
http://www.microwavecontrol.com/disassembly.htm
http://www.microwavecontrol.com/doorsw.htm

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 complexity and 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.
Got more questions? Please contact me directly for full details since FixYa doesn't always inform us of follow-up questions. Remind me of the full model number and FCC ID number from the tag and your detailed symptoms.
- William E. Miller, AS-EET
[email protected]
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide "Recycling by repairing since 1982"

Nov 25, 2017 | Microwave Ovens

1 Answer

Panasonic microwave oven cuts on for two seconds then shuts off


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://031d26d.namesecurehost.com/mwd/safety.txt http://031d26d.namesecurehost.com/mwd/disassembly.txt http://031d26d.namesecurehost.com/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.

If yours is not a Panasonic, please reply back with your brand and model number so we can help you.

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

Nov 03, 2011 | Panasonic NN-T994SF Microwave Oven

1 Answer

Mi panasonic prestige inverter microwave will not


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://031d26d.namesecurehost.com/mwd/safety.txt http://031d26d.namesecurehost.com/mwd/disassembly.txt http://031d26d.namesecurehost.com/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.

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.

Jul 18, 2010 | Panasonic NN-P295SF Microwave Oven

1 Answer

Panasonic NN-S254BF microwave oven runs for 2-3 seconds and then shuts off'


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.

May 31, 2010 | Panasonic NN-S254BF Microwave Oven

1 Answer

Microwave runs for 3 seconds and stops


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.

May 31, 2010 | Panasonic Microwave Ovens

1 Answer

Microwave shutts off after 2 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://207.234.249.73/mwd/safety.txt
http://207.234.249.73/mwd/disassembly.txt
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.

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.

If yours is not a Panasonic, please reply back with your brand and model number so we can help you.

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

May 22, 2010 | Panasonic NN-S592 Microwave Oven

1 Answer

None of the buttons are working; unplugged and


Depending on the model its down to the keypad

Feb 12, 2010 | Panasonic Microwave Ovens

1 Answer

Panasonic Sensor 1250W Microwave cycles off after only 5 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 , 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.

Dec 25, 2009 | Panasonic Microwave Ovens

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