Irrigation only... do you control the pump with a pressure tank or only
a pressure switch?
If no tank, you need to raise the cut-off setting so the pump can't
shut off during the irrigation. If you don't the pump will short cycle,
meaning on/off, on/off which heats up the control box components and
burns something up, like the start capacitor.
If you do have a pressure tank, it is too small to provide the minimum
off time based on the hp of the pump. That's usually stated as 60
sceonds for up to 1 hp and 120 seconds for 1.5 and larger hp to about
2.0. So increase the cut-off setting as if there was no tank.
Another possibility is improper air pressure in the tank if you have
one. The air pressure is to be 1-2 psi less than the cut-in setting on
the switch with no water in the tank.
Quality Water Associates