Hello,
I have an AEG PROTECT B 1500 UPS. The UPS worked fine for about 5 years. Now the icon "fault" appeared and the UPS is beep-ing every 1 second.
According to the manual there are only three reasons this might happen:
- UPS overloaded (not the case, even when the UPS runs standalone is in fault mode)
- Battery not charging (this was the case, when I removed the plug although battery was "full" the UPS went off immediately)
- Mains connection plug is loose (not sure what this means tbh)
Yesterday I cleaned up the dust and for 24h the "fault" message went away. I had to restart the UPS twice.
Today I saw the message again. I tested the batteries, although the batteries were displayed as "full" the UPS went off immediately, without any additional load. I took that to mean that the batteries were exhausted, after all batteries were 4 years...