We own a total of three Ecovacs Deebot N79 / N79S robot vacuum cleaners and we use them daily at When Hounds Fly.
As a dog training school, upwards of 30 different dogs may come per day for classes. It’s a LOT of fur and dander and lint and sand and dust!
Despite this, our N79s were giving us great service for many months until suddenly they all started giving the “Red Auto Light / Four Beep” error.
They would run for about 2 minutes and suddenly stop dead in its tracks and give off the error.
Initially our research showed it was a battery issue. So, we spend weeks playing with charging dock positions, cleaning the charge contacts, etc. and nothing seemed to stick.
After a while I had a guess that it was due to hair/fur accumulation in the beater brush and after giving it a thorough cleaning, I was really happy to see the robots perform again good as new.
All it takes is removal of four tiny phillips screws, and a flathead screw driver to help with removing the front wheel. I shot a video of me cleaning one of our Deebot N79 vacuums for you to see.
Hope this helps and keeps your Deebot working for many years to come and out of the landfill!