Question about Panasonic NN-P794SF Microwave Oven

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Electrical issues inherent in this model?

We've been buying (ahem...exchanging) this microwave at Costco repeatedly for replacements due to essentially the same thing. The first unit self-destructed one morning when pressing the Start button. It actually caused the lights in the house to dim. This unit also had a sticky door that required you to hold the door 'eject' button and then yank the door open.

Exchanged for Unit 2. This unit make chirping noises that sounded like electrical arcing when it was running. Random, periodic chirps. Not from the beeper or the rotating tray mechanism.

Exchanged for Unit 3: Again more arcing sounds when cycles run.

Exchanged for Unit 4: Vibrations from rear panel at times. This unit actually made the arcing noises while "off" with just the clock displaying. At that point I just unplugged it. I want to exchange it again, but the only other model Costco offers is the Panasonic with the stupid knob instead of number buttons. Costco will keep taking these stupid things back which is why I don't go to another store which will have an itty ***** return policy.

Anyone else have so much trouble with a microwave? It makes me want to go to the second-hand store and buy an OLD microwave. Those that were built to last more than a few months and to not burn your house down.

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I agree...the knob is so stupid. I spin a dial for volume in my car, not for the length of time I want to heat up my soup

Posted on Apr 09, 2013

  • dave Apr 09, 2013

    i agree...the knob is so stupid. I spin a dial for volume in my car, not for the length of time I want to heat up my soup

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Its the problem of voltage the electriccurrent.call a electrician and get the electricity power checked of your place.the oven is getting required current so this problem is coming.

Posted on Nov 13, 2008

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It seems your have a general failure in the power control or switch failure on the unit. Since your unit has power, and things lite. it is more likely you have a control/switch problem,


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Sorry to read about your problem, I hope this helps you out. you can have one of the issues.
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Sorry to read about your problem, I hope this helps you out.

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Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.

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Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.

I tried to help you. Please help me and Rate/Vote on my response. We take the time to answer your question's. take the time to rate us.Thanks and good luck

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Sorry to read about your problem.

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Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.


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Sorry to read about your problem, I hope this helps you out.

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Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.

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Sorry to read about your problem, I hope this helps you out.

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Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.
I tried to help you. Please help me and Rate/Vote on my response. We take the time to answer your question's. take the time to rate us.Thanks and good luck

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http://media.fotki.com/1_p,wbgdfgsrsttwqwbxgtqsskgwtqkq,vi/kgdfkfrkkxkfdtftrfb/1/1303472/5961857/image45625img-or.jpg

This can sometimes by caused by a power surge or glitch through the electrical lines.
You can sometimes clear this fault by completely unplugging the microwave for 1 minute.
Plug it back in and see if the fault code returns.
If it does, then you have an internal component failure that will need to be serviced by a technician.
Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances.
Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged.
A microwave radiation leakage test must be performed on the unit following any internal component repair.

It does not ALWAYS indicate a inverter control board problem however in other brands/models.
LG's service manual (for an example) suggests the f-9 code could be due to line voltage, magnetron, inverter module, "Relay2", or a loose connection between door/magnetron/control pcb.
Other indications might help narrow down these choices before having to pull out your multimeter and crack open the microwave case.
For example, if the microwave works, but heats slowly, then the troubleshooting manual narrows your choices down to magnetron or line voltage problems, and pretty much rules out the other possibilities.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

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1 Answer

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The F9 error code indicates a failed inverter. If resetting the unit does not help you will need to have the inverter & harness checked.


http://media.fotki.com/1_p,wbgdfgsrsttwqwbxgtqsskgwtqkq,vi/kgdfkfrkkxkfdtftrfb/1/1303472/5961857/image45625img-or.jpg

This can sometimes by caused by a power surge or glitch through the electrical lines.
You can sometimes clear this fault by completely unplugging the microwave for 1 minute.
Plug it back in and see if the fault code returns.
If it does, then you have an internal component failure that will need to be serviced by a technician.
Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances.
Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged.
A microwave radiation leakage test must be performed on the unit following any internal component repair.

It does not ALWAYS indicate a inverter control board problem however in other brands/models.
LG's service manual (for an example) suggests the f-9 code could be due to line voltage, magnetron, inverter module, "Relay2", or a loose connection between door/magnetron/control pcb.
Other indications might help narrow down these choices before having to pull out your multimeter and crack open the microwave case.
For example, if the microwave works, but heats slowly, then the troubleshooting manual narrows your choices down to magnetron or line voltage problems, and pretty much rules out the other possibilities.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

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