Bill — if you can find the pressure switch assembly, carefully remove it and look for a small orifice or hole on the flat face of the switch that threads into the pump body. That hole can get plugged by particulates that settle out of the water. Try cleaning it carefully with a toothpick or pin. If you find the orifice is clear, the pressure switch probably needs to be replaced.
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On May 28, 2014, at 9:41 PM, Wwadjourn via CnC-List <cnc-list@cnc-list.com> wrote: > > Anyone know how to troubleshoot PAR diaphragm pump that pumps great but will > not shut off when reaches pressure. Just keeps on grinding. There is NO air > in system. with faucets open pumps great, great pressure, but when shut > faucets it won't reach pressure and stop. Is there a setting for pressure? > Was working fine this spring, now not. > Bill Walker > CnC 36 > Pentwater, Mi
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