Constantly switching pump:
If the pump of your rainwater system starts and stops at very short intervals, the cause may be a leak in the connected piping system. For example, a running toilet flush, a dripping tap or a leaking lawn sprinkler.
In this case, the pump controller registers the pressure drop and switches on the pump properly. Since the flow is too small, the pump switches off again shortly afterwards.
Check for leaks in the piping system and connected sampling points and remove them. As a result, the continuous switching of the pump usually ends as well.
Eliminate the cause! Continuous switching harms the pump.