Question about Grundfos Pumps Grundfos MQ 3-45 1 HP Pressure Boosting Pump

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Grundfos MQ pump starts every 15 seconds

PUMP STARTS EVERY 15 SECONDS EVEN THOUGH NO TAPS ARE OPEN

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Pressure is bleeding back through the pump or system to the tank or well or where ever the water is coming from. Should be some sort of one way valve to keep water from going back to the source, mounted somewhere so that once pressure is pumped up, it will hold that pressure in the part of the system that has the pressure switch that controls the pump.

That or you have a leak where you can't see it. (Actually you do, it is just internal and not leaking outside the pipes!)

Posted on Nov 05, 2012

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I have the same problem with my Grundfos pump JP5PM RAIN. Follow the manual instruction I increased the pressure reducing valve and the problem been solved. Hope you so!

Posted on Dec 26, 2012

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