Thank you lee,Dave and Ben
Graham The brown and blue cables from controller run out to the pump, Check these connections and replace any damaged or worn connectors and cable if you find them.
Also check the cables on the pump these run from the pump base to the pressure switch. If any of these cables has a break or gets disconnected the control think the pressure switch has activated as the circuit is open.
Did the pump run OK connected direct to the battery of did it splutter (air in the line)? From your description
I am guessing you have an analogue controller it may be the calibration needs altering to take into account softer hose walls and water flowing a little faster in the hot weather.
http://www.youtube.com/watch?v=U_6dPgfBjSI analogue
http://www.youtube.com/watch?v=9kKoskb7l7c&list=UL Digital
The units are very flexible as to the range of pumps, hose and micro bore they will work with. The pump pressures up the system in order to establish a flow. The controller need to know what this pressure is. The amount of pressure required will in part depend on how fast the flow is or how far the pole is extended.
So why calibrate the controller to a pump?
What we are doing is telling the control what the maximum pressure the system normally operates at. To get a good flow at the brush head the system is probably running between 40 - 70 PSI. So the control knows that the normal max level is 70 PSI. When a user stops the water flow the pump will attempt to push against the restriction increasing the pressure above 70 PSI the pump sees this sudden rise and stops the pump. This is what we refer to as DEAD END (DE).
At this time of year the water Viscosity is high meaning the water flows faster add soft hose walls meaning the hose will expand more as well. These factors could mean the pressure in your system is higher than normal and altering the calibration may help.
Also how long have you had the analogue controller?
