20 Most Recent Panasonic NN-S954WF Microwave Oven Questions & Answers

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.

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.

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 you prefer to replace the inverter yourself, you can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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 it stops at 2-3 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://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.

your plug wire is loose from inside microwafe tighten it.

In Canada B & E industrial electronics (Calgary) carries the switches typically used for microwave doors (~$5). Reliable parts carries the whole assembly of 3 switches and the plastic interlock housing for about $25. Probably worth calling your local industrial electronics supplier. Never purchased online but should be available from any online electronics reseller. Honeywell is another manufacturer (see Microswitches)... HONEYWELL HIGH FORCE PIN PLUNGER 15A Part # V71C17D8
Allied Electronics Online (US) carries the same switch which is interchangable with yours. Honeywell / MicroswitchSwitch, Miniature, Basic, SPDT, PIN PLUNGER Actuator, QUICK CONNECT TERMINATION
(Are you getting all these numbers off the switch itself as the OMRON RE2 sounds a bit like a relay number...?)

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101
fsjfjh

there are 3 things that can be wrong 1st the stepping motor under the plate could be broken the motor is made up of lots of plastic gears to get to it you will have to turn the unit on its side so you the bottom of the unit remember to take the plate out 1st in the middle of the base of the unit you will see a panel where the motor is this needs to be cut out to gain access to the motor this will have 1 screw holding the motor in place 2nd and while you have the motor out you need to look at the coupling thats the part that the plate sits on as you remove the motor it will fall inside the oven pick it up and look to see if it has a split in the side as when the motor turns if the coupling has a split in it the motor wil just turn inside it 3rd the motor may not be getting any power from the pcb but u will need a test meter for this so try 1 and 2 thn if tht doesnt work it will need to go into a shop

Si sabía el problema que podría asistirle mejor así que debo conjeturar: Ninguìn calor: maìn magnetrón, fusible soplado, maìn diodo del condensador, abierto o puesto en cortocircuito. Si sopla el triturador es probablemente un maìn magnetrón. si simplemente ninguìn calor es probaby el diodo y el condensador. If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

You might consider just replacing the inverter assembly itself.

It will cost more than replacing the bad discrete components of course, but you would be avoiding the time and money involved in parts research, trial and error, and possible destruction of any newly installed parts if there remain other undiscovered defective components.

The inverter assembly (part # F606Y8M00AP) can be had for $79.12 here.

Otherwise, you would need to order the service manual, which is not listed by the major Panasonic distributors.

The service manual should be # SM-NNSN667.

The best place to order Sharp parts is Tritronics. Or you can call them toll-free at 866-779-5835.

In this case, call might be more productive to track down the service manual.

Good luck, and be safe.

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

if the is a convection model then the covection coill will smell that way if there is a geese build up and should be ok to use. however you should only smell that if you are using the convection mode.

if you are talking about the transformer then it will need replacing , because it is about to quit on you and then the microwave will not work at all
are you going to do the repair yourself? or are you going to need to take it to a qualified service shop?

Either the outlet for the microwave is not on its own breaker (which it always should be) or there is a loose screw connection or oxidation in the circuit breaker panel.

If the bad connection is on the neutral wire, this can create a dangerous condition.

You should measure (or have a pro measure) your voltage in various outlet s in the home.

If you have low voltage on some and high on others, you have a faulty neutral.

This can be serious. It should be checked.

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

Please change the PCB of your Microwave Oven.

It's possible a sensor or thermistor got unplugged during your work and didn't get plugged back in. Otherwise, I would suspect the microprocessor got "glitched". If so, *maybe* unplugging the oven from the power line for a few minutes will reset it. Or maybe the unit has a reset button or another reset procedure (I doubt that, but check the manual). Sadly, another common cause for this is that the code in the microprocessor gets irretrievably corrupted. In such cases, we can replace micro if it is available. It it's no longer available, that would make the whole microwave a goner. Looks like both the micro (LSI display) and the whole control board for this model are available from Panasonic parts: http://www.pasc.panasonic.com/epartr

All question need full 'make model (what it is)' please Use Search in the manual (CTRL+F) https://www.partmaster.co.uk/images/mediator/121/service%20manual%20-%20nr-b29sg2-sb%20,%20nr-b29sw2-wb%20%26%20nr-b32sg2-sb.pdf More here https://www.google.com/search?q=Panasonic+inverter+fridge+showing+Sr+and+E ..

Most probably the low voltage transformer of in the control panel is open . It has a thermal fuse which is between pin1 and pin 5 of the low voltage transformer. This fuse is however inside the transformer. If you get a DC resistance of about 350- 400 ohms between pin 5 and 6 of the transormer , connect an external 500ma fuse between pin 1 and pin5

It will do nothing until the clock is set.