Question about APC Back-UPS ES 350 - UPS ( external ) - 350 VA - UPS battery lead acid - 6 output connector(s) (NEWITEM13161548) UPS System

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APC ES350 strange noise

My apc es 350 is making a loud squeeling noise. What is wrong with this backup device?

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  • Anonymous Nov 11, 2008

    it is making a loud squeeling noise

  • Anonymous Jan 12, 2009

    I have to push the reset button to get it to to go away, basically have to turn the whole unit off...

  • Anonymous Mar 02, 2009

    it is also flashing red and green light

  • nevadarich Mar 26, 2009

    Unit making squealing noise. Had this one time before and was able to cure with reset but not working this time. Any help appreciated.

  • myapcalarm Apr 05, 2009

    alarm sounds and cant get it to turn off. Have to shut down the unit and all devices :(

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My solution was to unplug everything, hit the reset button, and then power the unit back up. The problem I found to be that I had my laser printer connected to the "surge + battery" side, and for some reason no laser printer can be connected to it.

Posted on May 28, 2009

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I was able to fix mine by replacing the battery with a new one. charge the new battery for 12hours before turning it back on.

Posted on Apr 27, 2009

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