APC Line-R 1200VA AVR all lights flashing

[FredMiles]

This morning all lights started flashing on my APC Line-R 1200VA AVR. What kind of fault do I have here?
Standard manual says nothing about it, and I cannot find service manual for it.

When all lights start flashing there is no more output from AVR (devices connected do not get power). 

[Teken]

Remove all connected loads and cycle the power button / breaker three times what are the results when no loads are connected?!?!

Questions Ask . . . 👍

[FredMiles]

In my case I found that power socket itself was faulty (due to faulty electronic breaker on distribution board). I wasted so much time figuring out what is wrong until I decided to ditch all special testing meters and use vacuum cleaner as the most reliable test for power socket 😀. 
Usually flashing lights means your equipment electronics are faulty, but thankfully that was not the case with my APC.
Nevertheless, many thanks for the advice - might use it next time.
It was a tad frustrating that I could not find any service manual with more details on how to handle problems with  APC - only thing available was that one page user guide which does not help much.
Best regards

[Teken]

Appreciate the follow up and root cause / solution.

Rock On . . . 🤘