The switch is sticking I only have to touch it very lightly and it turns off, But then there is also no water in the pipeline so it may sense no flow but then that would not explain the not turning on at the start but that maybe down to the switch sticking , I would take it apart and blast it with WD40 but not sure if this will damage it/or the switch anyway, When I removed the cover to test voltage at the pump side I did notice a loose connection although not totally disconnected still needed putting in its place correctly and tightning but the voltage was 12.5v on full power and 3.5v on marc 4 my normal setting
thanks so far guys keep it coming
Chris