Grundfos Mq3-45. Pump does not come on with just one faucet open. If I open another faucet pump comes on. If I shut one faucet the pump turns off. It was working properly for 7 years
Plumbing - Grundfos
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Answers & Comments
- changes in hydraulic conditions (clogged pipes, clogged filter, ...)
- pressure switch failure
- flow sensor failure
(in normal condition the pump starts when the consumption is higher than 1.2 l/min or the pressure is lower than 2 bar)
https://www.manualslib.com/manual/1569763/Grundfos-Mq-3-35.html?page=1#manual