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Radiator vents open and close repeatedly
Lately my radiator vents are opening and closing repeatedly, especially during the initial part of a cycle. The open and close times are around a minute or so. The vents hiss fairly loudly when open and make a noticeable sound when they close. The vents were replaced a few months ago. The radiators are single-pipe. Anyone know what could cause this and whether it means something is amiss?