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My pump has the same status code - what was the problem or what did the fitter replace ? Appreciate your help, Thanks, Sean

Hi, I installed a second hand Grundfos home booster but it has stopped and displays "Status S". Before it stopped it was pulsing on and off at a pretty high frequency - I wan't there at the time. I live in the middle of nowhere so am wary of getting Grundfos or their subcontractors out...