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Bosch Microwave sparking at door - HMT5050/02


Premium Member
Mar 2, 2022
Model Number
6-10 years
Hi - I have a Bosch HMT5050/02 that started sparking/arcing at interface between the door and the face of the microwave (pics below). I don't know what caused this originally, but it seems that now the enamel has been burned off at this location, which is suspect is likely to make the arcing problem worse. Is there any way to fix this? Can I paint a bit of nail polish or other enamel paint (or maybe an epoxy?) on these surfaces to help prevent arcing? Or is this microwave shot? Thanks!


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Maybe something got jammed in there once and chipped the surfaces causing the arcing? If you clean up the spots and touch up the surfaces I think it should be ok. Just make sure the door isn't cooked and hitting at that spot.

LINK > Microwave Cavity Touchup, White

LINK > Black Touchup

I'm not certain how close the black colour will be. There are a number of different shades of black used by manufacturers.


Dan O.

* Edited link to black touchup.
Last edited:
Thanks Dan! I think the little "weld" marks are causing contact between the door and the frame - can I file/sand down the lttle ridges so they're smooth and then paint over?
BoschHaver said:
I think the little "weld" marks are causing contact between the door and the frame

Actually, I think you have that backward. Microwaves will spark between 2 conductive surfaces. Either the surfaces were chipped before and the microwaves arced between them resulting in the burn marks and subsequent damage or there was something between those parts, facilitating the contact and causing the arcing. Hence my suggestion to check the door alignment which might have originally caused the chips, which eventually resulted in arcing.

BoschHaver said:
can I file/sand down the little ridges so they're smooth and then paint over?

Yes. That should be all that is necessary to correct damage to the finishes.

Dan O.
Sorry. I just realized the link to the black colored touch-up was wrong. I've updated the original link to point to the correct destination. Sorry.

Dan O.

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