apc surt1000xli error light blinking

[Mittumattu123456]

how can I fix  APC surt1000xli error light blinking

error code 11001 

[Teken]

If you haven’t done so already I would contact APC Technical Support to identify what error code 11001 is, besides an internal fault.

Let us know what that code means as APC insists not publishing such basic information to help trouble shoot expensive hardware! 🤢👎

While this fault is present does the UPS still operate correctly?!? Meaning, is it still providing power to the attached load? If not disconnect everything and stop using the unit. If the unit continues to provide power while in this fault state.

Remove the hot swap battery packs from the unit while it’s powered by AC Mains. What happens when you do this? If the UPS turns off stop using the unit.

If it continues to operate and supplies power to the connected output loads. Reinstall the battery pack and wait for the UPS to see them. Does anything happen when you do this good / bad?? 🤔

If nothing happens at this point remove AC Main from the unit. What happens when you do this? Do you hear the UPS (relay) click indicating it’s transferred over to the inverter?

Does the UPS turn off immediately?? If so replace the battery packs to start. If the unit continues to run and supply power to the connected loads for a reasonable amount of time say 10-30 minutes (depends on the load) and battery health / years of service.

Interim Step: 

You can try the brain dead process for your unit. Google how to do this and report back success / failure. Along with what you observed doing all the steps outlined above. 👍

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NOTE: Given the current problem do not have critical and expensive hardware attached to the UPS! Connect something like a light, radio, something cheap in case there’s a critical fault. Lastly, measure the line voltage at the AC Mains and compare it to the output from the UPS when connected to AC mains and while under battery power.

Doing so will offer insight and more data points as to how the UPS is operating. If say AC Mains is a steady 120 VAC (North America) and the output from the UPS is NOT there’s a problem. If the AC output is also NOT (approximately) 120 VAC while on battery - there’s a problem!