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Posted: 2024-07-1405:42 PM
Back-UPS NS 900M (BN900M) continuous alarm
My Back-UPS NS 900M has started a contiouous tone. On running a self-test, the green bar proceeds all the way to the right end of the space and then displays "Unable to conduct a self-test at this time." There is no load on the backed up outlets and they show 0 volts. The surge only show normal line voltage. On removing and testing the battery it shows 13 volts.