Grundfos Garden - Page 2 - Recent Questions, Troubleshooting & Support

http://www.fixya.com/support/t7631824-grundfos_water_pump_humming_no_turning

proper way is to install a water pressure regulator and due to potability reasons it needs to be brass ,bronze, stainless steel, or CPVC plastic , (no steel or cast metal) of course the less high tech way is to plumb a valve from pump outlet back to its inlet and adjust valve to max pressure setting you want at max demand , I don't recommend this method as it wont be able to give you a constant pressure regardless of demand as the first method will , Note: some water regulators are a "relieving" type and require special install methods and maybe three lines to it

I have a static pressure of 28 coming into my house (city water). In order to set the pressure coming out of the pump (outlet side), you will need to install a PRV. I have mine set at 50, although you can set it to whatever you like. Keep in mind that the pump will continue to run after there is no demand for pressure for aprox 12 seconds and then shut off. The additional run time will increase the pressure in your lines (mine increases to 61 lbs. I hope this helps...

Is there a capacitor on the motor normally under these symptoms and the motor is a single phase motor the capacitor is defective.

Bad seal.... motor needs to be disassemble to access the seal....

Hi,
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heatman101

Put a valve anywhere in the pump outlet piping that is convenient and throttle the flow on the pressure side. Grundfos pumps are well built and will handle the small increase in pressure. Do NOT restrict the inlet to the pump as inlet restriction can lead to cavitation and early pump failure.

Hi,
Here is a tip that will help you..

Jet Well Pump Well Jet Water Pump
http://www.fixya.com/support/r3695577-jet_pump_jet_water_pump