AC ES 350 constant tone

[Anonymous user]

Hi

I have an AC(S?) ES 350 and it randomly starting making a solid tone. I don’t believe a light was flashing or a solid on. From reading other threads, this sounds like a battery. Does anyone have any insight or agree with the battery?

Thank you.

[BillP · Accepted solution]

i have 2 bx625ci-ms that have the same randomly solid tone. it turns out its overheating, since it only happens during hours where room temperature is too high. relocated the ups solves the problem for me.