A clear explanation of frequent starts and stops, and the observations that help a diagnostic visit.
Short answer
Short cycling describes a pattern where equipment starts and stops more often than expected. The pattern can have different causes, so the useful first step is to record when it happens, whether comfort has changed and any controller messages before arranging diagnostics.
Record the running pattern
Make a note of how often the heat pump starts and stops, what the controller is calling for and whether the pattern is new. You do not need to time it precisely for the information to be useful.
Consider the wider symptoms
Frequent cycling alongside reduced comfort, unusual noise, an error code or a change in energy use provides a clearer description than cycling alone. Share the full pattern when you request help.
Why diagnostics are the right starting point
Short cycling is a reported behaviour rather than a diagnosis. A focused visit can review the factors relevant to the system and explain what, if anything, should happen next.
The significance depends on the system and the overall symptoms. A persistent or new pattern is worth a diagnostic conversation rather than being ignored.
Can a controller setting cause frequent cycling?+
Settings can affect how a system responds, but they are only one part of the picture. Record the controller setting and arrange diagnostics if the pattern continues.