Question about Pool & Spa
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: Hi, I have a Grunfos
First check with a pressure gauge to see that the pressure is, indeed, dropping. Then, if it is possible, turn off the outlet valve to isolate the pump.
If pressure is still dropping, there is probably a check valve on the inlet of the pump that prevents water from the high pressure side from leaking back to the inlet piping side.
To test this, let the pump run and pressurize the house and immediately close the valve for the incoming water. If the pressure holds, then open the inlet valve and see if the pressure drops. If it drops, the inlet check valve has to be replaced (or cleaned).
Posted on Feb 19, 2011
Grundfos said the problem of on off every few seconds was air in the line. Then
later admitted it was the control unit. After replacing two units in 2 yrs I replaced
it with a standerd pump pressure switch.....Runs fine
Posted on Jan 14, 2012
Tips for a great answer:
Feb 27, 2015 | Grundfos MQ3-45 1 HP Pressure Booster...
Oct 07, 2013 | Grundfos MQ3-35 3/4 HP Pressure Booster...
Nov 17, 2011 | Grundfos MQ3-35 3/4 HP Pressure Booster...
Oct 16, 2010 | Grundfos MQ3-45 1 HP Pressure Booster...
Jul 12, 2010 | Grundfos MQ3-45 1 HP Pressure Booster...
Mar 09, 2010 | Grundfos MQ3-35 3/4 HP Pressure Booster...
26 people viewed this question
Usually answered in minutes!