Overload on ADP Back-UPS XS 900 with trivial load

Is red light on for overload or for battery?
If on overload, try reducing the load on the UPS. If red light on overload persists buy a new UPS (overload fault hard to repair).

Red light on battery - replace the batteries.

Red light on boost or buck, may mean that the nominal voltage of ups and the limits need to be changed/corrected.

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

when red light on means the ups under battery mode. whether your ups gets mains mode, if not you check the fuse, MOSFET, Relay and make it working. your battery may be weak that is why
the computer get on

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

Try unplugging some equipment from the UPS. The total load should be less than 865 W. Printers and scanners often are culprits.Some gaming desktop computers can have a power supply that will be too much for this UPS. (I've found that even having the printer on the surge only part of the UPS can be a problem. I have the printer on a separate surge protector.)

Since the overload is new, did you add any equipment to the UPS recently or upgrade components?

If you reduce the load, and the problem continues, the UPS may have a fault in the circuitry. If it is under warranty, contact APC.

I hope this helps.

Cindy Wells
(I have replaced APC units after 3+ years when they can't properly recharge the battery - with a new battery. The symptoms are 1) getting a overload when a small load is on the UPS. Small load - desk lamp, 13" TV or 2) not keeping the item on when the power goes off.)

black is ground

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.

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.

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.


Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

Internal fault.