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Old 02-24-2020, 09:40 AM
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Find the two fan connectors on the pump's controller and swap them. 1 <-> 2

The H80i v2 is a single fan channel, so one of the fans is the "control fan" and the other one mirrors its behavior. Possible the current control fan has developed a fault in its control wire. Other possibilities as well, but this is the easiest one to check.
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