Problem
A fluctuating temperature means the system alternates between overheating and underheating. This is uncomfortable and costly, since the unit runs more often at extreme settings.
If the room sensor and the outdoor-temperature curve both regulate strongly, they start correcting each other. We recommend reducing the influence of one.
A sensor in direct sunlight, near a fireplace, or in a hallway gives a misleading signal. A large night setback in an underfloor-heated house also causes fluctuation, since the floor reacts slowly.
Usually not in an underfloor-heated house. In a radiator-heated house, a small setback can work.
±0.5 °C per day is a good result. More than 1.5 °C points to a control problem.
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