Question about APC Back-UPS® XS 900 (BX900R) UPS System

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

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  • gnach Feb 01, 2012

    It's probably too late for you, but, the same happened to me. After buying new batteries, the same overload alarm re-occurred. After checking th 'net, it seems to be a cheap, crappy fan that begins to fail that cause a heat sensor to set off the alarm.
    http://www.youtube.com/watch?v=eqNZVIlX2...

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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

Posted on Feb 12, 2012

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Posted on Jan 02, 2017

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SOURCE: apc xs 1500 overloads even with nothing plugged

Hi,

Plz check MOSFET which working in inverter section.

Posted on May 12, 2009

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Take the battery out and see if it does the same thing when you turn it on.

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Jan 06, 2011 | APC BX800 Back-UPS XS 800 (APNBX800) UPS...

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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





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How to use apc rs 900 without battery


No no way to use the ups without battery it will not show mains supply without battery and you cannot use it as a stabilizer you must connect battery

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

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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

1 Answer

Ran for about 15 minutes. Hooked up to one


Ether the unit is overloaded or the internal battery is given out, or the overload circuit has failed there are only 3 problems that it could be. Not to go to much in depth on this unit APC does have a garentee and I trust you will call them and tell them this exact same issue if they find the unit is faulty they will replace it even though it may be out of warrenty if you get them on the phone and explain to them they will help I know a Greg over there.

Aug 12, 2009 | APC Back-UPS® XS 900 (BX900R) UPS System

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