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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
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