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Started making a horrible high-pitched whining sound a few days after my return window closed
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About two months after ordering, the unit started making a terrible high-pitched, whining noise
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Emits high pitched humming noise.
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, very loud, high pitched tone which would normally mean that the unit is on battery power - but my computer and everything else connected to the UPS (battery and surge only side) were completely dead the instant the lights flickered the first time
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I don't know if this is considered normal or not but this UPS makes a constant, loud, high pitched tone
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When fully charged, it has a faint, high pitched whine.
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Also, when plugged in, there was a high-pitched noise, very faint
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But it makes an unbearable high-pitched noise
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Switching to battery emits a lower toned buzzing (which is pretty standard), but when it turns back to AC online it emits a constant high pitch sound which hurts my ears.
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Let's out a super high pitched barely perceptible whine/shriek
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It does not work -- I have taken t o the cleaner
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t has been working for a few months without any probems