Question about Panasonic NN-T654SF Microwave Oven

1 Answer

Oven shuts off on cook after about 2 seconds

Is the problem the magnetron tube?  We have used the oven beginning 10-31-05.  If the magnetron tube needs replacement, where in Olympia, WA can we obtain the necessary service.  The model is NN-1995SFB, according to the sales receipt, but the Operating Instructions reads: Models:NN-T695/T785 and T795/T985/T995.
Reply to: June Kerseg-Hinson  (email address below)
Thank you.

Posted by on

  • Anonymous Mar 31, 2014

    lost power and now reads demo code

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Panasonic Master
  • 8,820 Answers

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.

Posted on Jan 12, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Ge pvm2070smss shuts down


It may be a noisy magnetron if the failure occurs in a second or two of hitting "Start" to begin cooking.

See this FixYa solution. even though your model number is different.

Otherwise, if the internal cooling fan is not running when you are cooking, it will shut down after 30-60 seconds or so and stay off until it cools back down.

Also see http://www.microwavedisplay.com/jvm2070.htm

Feb 24, 2013 | GE PVM2070SMSS Microwave Oven

1 Answer

Coleman EB15A - Buzzing noise from transformer area, no heat or fan


see this causes and proceed. God bless you
Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.

Exhaust Fan Motor If the microwave is loud when running the fan motor might be
Stirrer Motor If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.

Turntable Motor If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.
10_18_2012_1_04_05_pm.gif

Oct 18, 2012 | Microwave Ovens

1 Answer

Microwave made a loud grinding noise while heating a cup of coffee for 1 minute,now everything is shut off. We checked the curcit breakers all ok, and there is power going to it!


see this causes and fix it. God bless you
Turntable Motor If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.
Stirrer Motor If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.

Exhaust Fan Motor If the microwave is loud when running the fan motor might be

Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.
10_16_2012_2_01_11_pm.gif

Oct 15, 2012 | Microwave Ovens

1 Answer

GE Microwave (JVM1860CD001) control board buzzes.


see this causes and fix it. God bless you
Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.
Exhaust Fan Motor If the microwave is loud when running the fan motor might be
Stirrer Motor If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.
Turntable Motor If the microwave is loud or noisy the turntable motor might be worn out. This is a common problem and relatively easy to replace.
10_11_2012_10_48_03_am.gif

Oct 10, 2012 | GE Microwave Ovens

1 Answer

Microwave not working stating error 3 or error sensor or just coming on by itself. we have tried shutting down circut breaker


Hello

"ERR 3" means that the magnetron units have failed in the microwave. Food will not cook or heat up when the microwave is in use.

This code is different than "ERR 1" or "ERR 2" because with those the microwave is still operational. "ERR 3" means a complete failure.

The magnetron is the main source of power and heating in a microwave. Magnets work inside a magnetron tube to create the heat and voltage needed to cook items.

Bring the microwave back to the retailer or a repair shop for service. You may also consider purchasing a whole new microwave if the prices are cheap enough.

Oct 04, 2011 | Microwave Ovens

1 Answer

G E microwave model # JVM1190BY has reading sensor error or error 3 or at times just starts up when we are not even using. tried shutting circut breaker....whats going on


Hello

"ERR 3" means that the magnetron units have failed in the microwave. Food will not cook or heat up when the microwave is in use.

This code is different than "ERR 1" or "ERR 2" because with those the microwave is still operational. "ERR 3" means a complete failure.

The magnetron is the main source of power and heating in a microwave. Magnets work inside a magnetron tube to create the heat and voltage needed to cook items.

Bring the microwave back to the retailer or a repair shop for service. You may also consider purchasing a whole new microwave if the prices are cheap enough.

Oct 04, 2011 | Microwave Ovens

1 Answer

Ge microwave overhead 2004 model start it up and it will run for 2 seconds and it shut down have to reset time date ect,ect and it might work next time or you may have to wait till the next day before it...


There are a couple of safety thermostats under the cover that can shut down power. One is on the magnetron tube (the microwave source) in case the tube overheats. Another one is on the cooking cavity to shut the oven off if something catches fire while cooking. These interrupt the power, same as unplugging the oven, which is why you need to reset everything.

It's possible that because of the oven's age, the magnetron tube is weak enough that it's overheating when it tries cooking. As the tube ages it works harder and gets hotter. But it usually takes more than a couple of seconds for the thermostat to operate. These thermostats sometimes go bad on their own and operate too soon.

Other possible causes for power loss are a fuse loose in its holder or intermittent connections to the control circuit board.

Since troubleshooting power problems means working on the oven with the cover off and the power on, you should leave repairs to a professional. MICROWAVE OVENS USE HAZARDOUS VOLTAGES WHICH CAN KILL YOU. Let a professional check the oven and give an estimate for the repair. Given the age of the oven you may want to consider replacing rather than repairing this one, but let cost be your guide.

Jul 09, 2011 | GE Microwave Ovens

1 Answer

I have power, but when I start to cook it shuts off and needs to be reset. It only cooks for 2 seconds and then shuts off. Did I blow an internal fuse ?


Your magnetron is likely failing.

See this FixYa solution. even if your model number is different.

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

Dec 05, 2010 | GE JVM1540SMSS Microwave Oven

2 Answers

Model JVM1650WH02 will shut off about 2 seconds or less into cook time. everything else works such as light and clock and sometimes the wave will cook.


magnetron is leaking internally, do not use until magnetron is replaced. the mag creates interference with the control board and resets it

Feb 05, 2010 | GE JVM1650 1000 Watts Microwave Oven

1 Answer

The microwave was working great cooking bacon. While it was cooking the sound changed and it stopped cooking. The light was still on and it continued to rotate but it would not cook anymore. What's wrong?


first check the h.v. diode and the h.v. capacitor,one has opened up and is not producing h.v. to operate the magnetron tube,the cap is about 4" long and oval in shape with 2 wires coming out the one end,the diode is about 1-2" long black and can be square or round and are near the magnetron tube area of the oven,chk these first they're the cheapest to replace

Nov 19, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

Not finding what you are looking for?
Panasonic NN-T654SF Microwave Oven Logo

240 people viewed this question

Ask a Question

Usually answered in minutes!

Top Panasonic Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

8820 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Devabhakthuni...
Devabhakthuni...

Level 2 Expert

224 Answers

Are you a Panasonic Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...