Question about APC Back-UPS XS900 (BX900) UPS System

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Beeps and overload light flashes

I left town and returned to find the APC xs 900 sounding a steady beep and the overload light flashing on the unit. It was not doing that before I left. Only 2 devices plugged into the unitl (PC and monitor). I reset by turning the power button off and then on again. The "online" light blinks for a moment, then the "on battery" light blinks for a moment and goes back to the online light staying on. After about 1 minute the overload light comes on and the unit beeps a constant beep.

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Internal fault.

Posted on Mar 09, 2010

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2 Answers

Error light in my apc smart ups sc 1500va ups


1. Four beeps every 30seconds (On Battery LED will be illuminated)
This alarm indicates that the Battery PowerSupplied outlets are now supplying battery power as opposed to power from theutility. If the UPS determines that the input utility power is unsafe for yourcomputer equipment, the UPS will switch to battery power.
Note: Ifthe power disturbance is brief, you may only hear one or two beeps.

2. Continuous Beeping (On Battery LED will beilluminated)
This alarm indicates that a Low Batterycondition has been reached and that the UPS will soon shutdown. Once the UPStransfers to On Battery operation, it can only stay on battery for a limitedamount of time. The UPS will sound this alarm about two minutes before thebatteries are totally exhausted. Once exhausted, the UPS will shutdown and turnoff its output power to your equipment. If you hear this tone you shouldimmediately shutdown your computer to prevent data loss or corruption.

3. Continuous Beeps for 30 seconds (BackUPS OFFICE 250 and 280 ONLY)
This alarm indicates the unit has detected anOverload condition after it has performed a self-test during start-up.

4. Continuous Two-Tone Beep
This alarm indicates a severe Overload wasdetected while the unit was on-battery operation. This tone will continue tosound until the unit shuts down.

5. Continuous Tone (On Battery LED will beflashing)
This alarm indicates that the battery-poweredoutlets are overloaded.

6. Continuous Tone (On Line and On BatteryLEDs flashing) Back UPS OFFICE 350,400, and 500 ONLY
This alarm indicates that an internal UPS faulthas occurred.

Dec 08, 2011 | APC Smart-UPS SC 1500VA UPS System

1 Answer

Have a APC xs-900 that indicates overload and there is nothing plugged into it. New battery did not help.


change the internal fan its a 18-24V type change it with a ball bearing type and yes a 12 volt will also work, with 120v input fine and under medium load the fan is only supplied with about 15 volts and only reaches 24 volts if the load shoots up or there is a power fail situation

Sep 09, 2010 | APC Back-UPS® XS 900 (BX900R) UPS System

1 Answer

APC XS 1000 UPS battery back up beeps three times every minute. "see manual" "AVR" flash in screen.


It is SUPPOSED to beep during battery supply power.

It drove me nuts,too!

I know it's running off of the battery!!!!!!

I have APC 550 and a 750. Both do it.
Not anymore.

I took it apart and mangled the beeper,inside.I used a dental pick and poked the diaphram inside of it.(power off)
Clicks,but no BEEP!

Barely audible,now. Done.

Sep 05, 2010 | Computers & Internet

1 Answer

I have an APC XS 900 for about 1 1/2 now. I started getting a continuous beep with the overload light turning on. I could not get it to stop, even when the computer was disconnected. After reading the...


You need to reset the unit to recognize the new battery, I had same problem with one apc smart ups on the bench the other day.

On ours we had to turn off the unit unplug the battery wait 5mins

press the on key and hold for 20secs

reconnect battery

plug in to mains

and start as normal. We did this but still had very low battery time and the flashing lights, so we disconnected the comms interface, that sovled the problem.

It may work for your unit, suggest you check the manual before you try if you are unsure

Hope this helps
Thanks for using FixYa





Aug 09, 2010 | APC Back-UPS XS900 (BX900) UPS System

1 Answer

Infinit loo between online and on battery?


With all 5 units behaving the same, I would expect that the power is still out of range. If the power is too high or too low (see manual for thresholds) the unit will stay on battery power to protect the attached equipment. If you have the software loaded, it will show you what the input AC voltage is at. Otherwise, it could be time for new batteries: http://batteryinternational.com/apc-smartups-1000-ups-battery-ups-batteries-f2.html

May 09, 2010 | APC Smart-UPS 1000VA UPS System

1 Answer

Tone alarm goes off and flashes "overload" and on the back "building wireing fault" is lit up


The "Overload" light and alarm is to tell you that the devices connected to the UPS are drawing more current than the UPS can safely provide with battery backup. You should disconnect a few items, and the alarm and overload light will turn off. The "Building wiring fault" light on the back is to tell you that there's no proper ground wire inside the wall outlet that you're using. These two problems are not related to each other.

Mar 04, 2010 | APC Back-UPS® XS 900 (BX900R) UPS System

2 Answers

Have brand new APC 900 UPS and when plugged in, both green & yellow indicator lights flash. Non-stop. Left unit plugged in for 18 hours (off) to charge battery as info sheet suggested, but lights still...


Nope! The internal battery is not plugged-in correctly. Unplug the APC unit and open the access door to the battery (it is not dangerous to do).
Re-seat the two wire clips (red & black) to the battery. The positive post has a red mark on it.
Close it up and charge for a few hours before using.

If the symptoms continue, return unit to store.

Sep 19, 2009 | APC Back-UPS® XS 900 (BX900R) UPS System

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