Constant green light with noise

[BillP]

hello, having a problem with my apc ups Es 750. It's a constant green light with a strange noise. Not the same noise when the battery need to change. Battery does need replacement. But when I plug it in I get a green constant light and the noise. The model number is BE750BB

[BillP]

Hi,

These are the Audible tones and indicators for the BE750BB

On Line: Green power on LED lit with no tones

On Battery: 4 beeps every 30 seconds, the power on LED will be off while beeping

Low Battery: Constant beep, the power on LED will be off while beeping

Overload: Constant tone, there is no power from the outlets at all

Low voltage sleep mode: 1 beep every 5 seconds

[BillP · Accepted solution]

Green light is on and constant tone and when plugged in, outlets still work. 

[BillP]

Hi,

Reset the unit

1: Disconnect any attached load.

2: Unplug the UPS from the wall socket.

3: Disconnect the UPS' internal battery.

4: Push and hold the "On" button on the UPS for 5 seconds

5: Reconnect internal battery.

6: Plug UPS in to known good power source.

7: Turn UPS on.

If after resetting the unit the UPS still has a constant tone with nothing plugged into it it will need to be replaced.