SOURCE: APC back-ups es500 alarm continuously sounds why
It means it has an internal fault. if still under warranty period, just call APC and ask for replacement. if it out of warranty bring it to service center or better if you have to buy a new one because as far as i am concerned repair cost of this unit is much expensive than a new unit
SOURCE: APC ES500 switches off and the red light blinks.
The battery for this unit is an APC# $^ (RBC46)
Also known as a UB-1280 (12 volts 8.0 AH- amp-hour)
Did you add a greater load ... like a small "heater"?
Remove most of the plugs for what is plugged into it and try again.
If you have a "printer" plugged into it, unplug it, from the "protected" side. It belongs on the "surge" side of the APC Battery backup.
Hope this helps!
SOURCE: we have apc es500 we used almost 2 yrs and now its
Contact APC.com
Here is the page for your model , it looks like it qualifies for the tradeups program. Or you can purchase a battery for it and fix it yourself.
http://www.apc.com/tools/upgrade_selector/index.cfm
SOURCE: what is the problem of
short circuit may be happen to your UPS. try to open your UPS and look for the short circuit or try to call a electronics service technician... :))
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