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APC AVR LS1000-MS 1000VA 230V constant noise
APC UPS for Home and Office Forum
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Posted: 2022-08-2612:48 AM
Hi @Anonymous user
Thank you for reaching out to the SE Community, my name is Jon and I will assist you with this query.
Apologies for the late revert, may I know if the sound is accompanied by a flashing LED at the back of the LineR? Kindly check as well the voltage that is being fed to the unit and try changing the voltage selector at the back.