Back-UPS ES 550 beeping continuously

[t_e_d]

Hi,

My Back-UPS ES 550 (APC BE550G-FR) stopped working.
When I press the ON button the green led flashes a few times, then the device starts beeping continuously.
According the manual the situation looks like an overload. As there is no device plugged it should be something else.
I tried the reset procedure (disconnect any attached load, unplug the UPS from the wall socket, disconnect the UPS' internal battery, push and hold the "On" button on the UPS for 5 seconds,
reconnect internal battery, plug UPS in to power source, turn UPS on) but it didn't help.
I bought a new battery, still no change.

Is there something else I should try?

Thanks for your help.

[JonPro]

@t_e_d 

Let me know if the Logic Reset procedure given below would resolve the issue.

How to Brain Dead a Back-UPS unit. (Full UPS Logic Reset) (FA158947) 

[t_e_d]

Applying the Reset procedure helped a bit but the device still does not work as expected.

Now when I press the ON button the UPS stops producing the continuous tone.

If I connect an electric device to the UPS, the device works fine but once I unplug the UPS from the wall to simulate a power failure, the connected device stops working immediately and the UPS starts producing a continuous tone.

Any other suggestion?

Thanks.

[JonPro]

Hello @t_e_d 

I am sorry to hear that.  It is either the battery is unable to support the load and needs to be replaced or the UPS itself is faulty.