iFixit - Answers With Device "Panasonic NN-SC668S Microwave"

Panasonic NN-SC668S Microwave: Why does it trip the breaker every time I start it up?

Tue, 13 Jan 2026 21:42:23 -0700

Hi all, my microwave would trip the breaker every time I try to start it. Here's what I've done so far:

I've been using this microwave for around a year without any issues. This started happening in the past few days. The breaker is a 20A breaker, which I think is shared between the fridge, stove, and microwave. Again, this worked for about a year without issues. The microwave alone pulls 12A.

I used my multimeter's continuity test, and confirmed that both thermostats and all 3 door switches are working. The only thing that didn't pass the continuity test is the lamp unit (Light Bulb). The lamp unit has 66 ohms of resistance. However, the light turns on every time I open the door. The internal fuse also has continuity, here's a picture of it.

While keeping the fridge and stove operating, I also plugged a kettle into the same outlet, which didn't trip the breaker. The kettle draws around 9A.

I tried finding parts diagrams or wiring schematics, but can't find any. If anyone got any insight on this, that'd be greatly appreciated!

⟐ Answer edited January 13, 2026 at 21:42 MST

Panasonic NN-SC668S Microwave: When I press start button it always shutdown

Sun, 17 May 2026 21:46:34 -0700

When I press start button it always shutdown

Panasonic NN-SC668S Microwave: Microwave oven leakage preventable?

Wed, 11 Mar 2026 11:05:35 -0700

My Panasonic microwave oven has been leaking and arcing at the door but seems to be heating okay. There is an obvious discoloration on the door and the oven. The location is top right hand corner just outside the oven opening. The size is 1 inch x 0.33 inch on the door (a small bulge) and the oven ( a small depression). I don't think it is leaking outside the oven since there is supposedly an adjacent microwave leakage block on the door.

Question:

Has anyone experience with such leakage?

Is it likely to get worse?

Is there any way to repair the damage and eliminate the arcing?

What is the danger if I keep using it?

Thanks a lot for your help.