Official support source
Three beeps + flashing red: Drop sensor problem
eufy · RoboVac models covered by the linked article · reviewed 2026-09-03
What it means
The robot is detecting a drop or the drop sensors are obstructed.
Safe checks from the manufacturer
- Move away from strong sunlight or very dark carpet.
- Power-cycle the robot and wipe all three drop sensors with a clean, dry cloth.
Open the official support page
Stop if the error returns
Do not open a battery, charging dock, motor or sealed electrical assembly. Use the manufacturer support route.