Do you have a Cycle Alarm?
Excessive cycling (continuous on/off
operation) can causes the temperature to rise inside of
the pump and damage it. Common causes of cycling are
small leaks or very low flow rates (i.e. ice makers, R.O.
filters, etc.) in a plumbing system without a pressure
accumulator tank. A check valve installed directly on the
discharge of the pump can also cause cycling. If very
low flow devices are going to be installed, Headhunter
recommends the installation of a small pressure
accumulator tank in the plumbing system.
If Ain't a Newell, It Ain't Wurt Oonin!