APC Back-UPS 550 building wiring alarm - how to reset

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Good day to all.

I have 3 APC Back-UPS 550 that all exhibit the same condition described in the subject line. When powered up, the Building Wiring Alarm activates. I removed them from the original job-site where the fault occurred & replaced all 3 with new ones. These do not indicate any wiring faults in the same wall sockets that the original 3 units were connected.

After powering up the "old" units in a different building/location, all 3 continue to show the fault light & emit the warning tone. I've confirmed the building wiring at the current location is correct. Replacing the batteries has no positive effect on eliminating the alarm condition.

Is there any "reset" procedure that I can run on these units to allow them to work properly again or are they damaged beyond further use?

Thanks for any feedback/suggestions that the forum members can provide

Regards,

WTG21953

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