EcoFlow power station beeping: what it means
A short beep when you press a button is normal. Three beeps a second that do not stop are not. What the manuals say to do.
There are two very different beeps, and the manuals treat them very differently.
A single beep when you press a button: normal
The EcoFlow DELTA Pro 3 manual says the station has built-in buzzers, and that pressing a button or changing settings in the EcoFlow app may trigger a beep as a reminder. You can turn it off in the app.
Three beeps a second that do not stop: stop using it
The EcoFlow DELTA 3 Plus manual says the buzzer keeps alarming, beeping three times per second, when a severe port malfunction is detected. Its instructions: stop using the power station immediately, remove all input and output connections, and contact EcoFlow customer service.
Do not keep charging or discharging it to see if the beeping stops. A port fault is a safety issue, not a setting.
What to tell EcoFlow support
Note what was plugged in when it started, the screen icons or error code shown, and your serial number. The manuals also point to the EcoFlow app for error codes and troubleshooting.