Question about Grundfos JPS4 1 HP Pressure Booster Pump
It sounds like you have a bad pressure switch. I would also check the pre-charge pressure in the expansion tank. This needs to be 2lbs less then the "cut-in" pressure of the switch IE: 30-50 switch 28lbs air in pressure tank.
Posted on May 14, 2013
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Posted on Jan 02, 2017
Definately sounds like a leak in the pipes from the pressure side of the pump onwards, even the smallest leak will cause it to turn on to regain adequate pressure.
Posted on Jul 09, 2009
These days it happened to me but it was an electrical problem, but mechanical..When you loosen the center screw, you should try to turn the pump house with the help of a screwdriver (to the right and left) in turn means that the water was blocked by limestone, which is unlocked after you do water to pass through screw without to see if it turns on its own. The water that comes out is very little if it works then closes the screw .. good luck
Posted on Nov 06, 2009
I was ready to pass your question and go to the next person because you said it was making a clicking, and I could not relate or diagnose that type of sound for that kind of pump. Thank God I decided to read to the end where you said rattling sound. that is what you should have said in the beginning.
1st, did you replace the pump cartridge or the whole pump unit? 2nd, is the pump in a different oriented position than the original pump position? The inner cartridge floats inside the pump as it rotates and if it is in an oriented position that allows it to bounce (to & frow) it will make this rattle sound; not serious but can be annoying. It is was a replacement cartridge, perhaps the new gasket and the old gasket are in place, thus allowing too much space for the cartridge and it therfore moves too much and rattles. Or, if it was replaced as a whole new unit. there is a problem with it that you should not be responsible for, except for the positioning orientation. Finally, if there is still too much air in the system, the air bubbles will jossle the cartridge untill you get rid (bleed ou ) the remaining air. Goodluck<Macgivor
Posted on Jan 02, 2010
SOURCE: Grundfos Pump Wont Stop Running
Close the outlet valve then turn electrical switch on manual for a few seconds until any air is pushed out then open the valve and return electrical switch to automatic.
Posted on Aug 01, 2010
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