Question about Grundfos MQ3-45 1 HP Pressure Booster Pump
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Posted on Jan 02, 2017
This is a problem with your bladder in the pressure tank or the pressure switch. Ether one will produce this cycling on and off. Good luck.
Posted on Mar 09, 2010
I have the same problem and have found that the inlet check valve has a broken shaft in the center of device. It is a multi-piece plastic unit and it looks as if it is not quite seating and therefore the internal pressure leaks slowly back into my low pressure suction line. The pump will start and the pressure will build then shut off for about 30 minutes then cycle again. I am going to replace the check valve.
Posted on Apr 18, 2010
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