eufy RoboVac 11s troubleshooting

How do you know when the device is broken and needs to be replaced? I have a Eufy 11S Max, purchased on Amazon in 2020.

I replaced the battery with an official Eufy battery. I performed the reset steps with a Eufy Customer Service representative. It still shows the orange (or red) light of death. The CS representative informed me that I needed to purchase a new one.

O k I have a robot vacuum 11s I've had it in storage quite a while. I pulled it out of storage replaced all the normal parts. Put it on the charger. Had to buy a new remote. And still I can't get it to work. I don't know what i'm doing wrong there's somebody have any information to help me

I had an 11S reporting dirty edge sensors (red light, 3 beeps). All three sensors simply slide out and unplug from the main board.

Using a spudger it is easy to pop them open (remove lens, then split the body) as they are only clipped together.

Water had caused corrosion on one of the phototransistor leads causing it to become detached. The sensor boards consist of just a 3mm phototransistor and a 3mm IR led (hence the 4 pins).

Replacing the damaged phototransistor fixed it. It was the front sensor, fwiw.

My eufy is showing red light and not charging .Pl give solution

My eufyvac11S is showing red light and also making beep sound three times.pl give me solution