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APC Back-UPS CS 350VA - UPS - 350 VA - UPS battery lead acid - 6 output connector UPS System - Page 8 Questions & Answers
APC SURT3000XL UPS
The fault indicator means that there is a fault in the circuitry of the UPS. It could be the control board or another part of the system. (If the batteries were bad, you would see the Replace Battery light illuminate.) If the SURT3000XL is under warranty, contact APC. The standard warranty period is 2 years for repair/replacement. Note: you'll probably have to pay for the shipping of the unit. If the unit is out of warranty, replace it with a new UPS. I hope this helps. Cindy Wells
Inverter circuit diagram
It's cheaper to get a new one then to try to fix these. Taking into account time and frustration.
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