ES-550 Just Will Not Stop Beeping 4 Times/30 Seconds

[Anonymous user]

I have a couple of these UPS units. One of them keeps beeping 4 times/30 seconds (with light off during beeps) even when AC power has been restored. What does this mean? I know this is the signal for battery operation. But it should stop, right? I have powered the unit off/on and still it does this. Driving me crazy.

Thanks!

[Anonymous user · Accepted solution]

I do not use the surge-only outlets. But I plugged in a phone charger and found no power in those outlets. I just realized that this unit has a circuit breaker on the rear. Normally, I don't think I have enough load on it to cause an overload. But sure enough, I checked and found the breaker needed to be pressed. So the unit was still running on battery to support the load I have there and it seems like it would not switch back to AC power until the breaker was reset.

So FYI to others out there.

[BillP · Accepted solution]

David,

As you have found, the 4 beeps every 30 seconds does indicate on battery and checking the surge only outlets was a great way to test that.  If the circuit breaker on the unit is tripped, the unit will operate on battery to provide power to battery backup outlets only.

Regards,

[Anonymous user · Accepted solution]

Ok what if the breaker is NOT tripped and the unit is still beeping 4 times every 30 seconds?