I have moved into a house which uses a Grundfos UPS 3 pump to circulate the water in a wet underfloor heating system. Last autumn the pump would not start - the blocked message showed - so I replaced it. This year, the same thing has happened with the new pump. I have freed the impeller using a screwdriver as advised in the instructions but the red and orange error signal still appears. Any suggestions ?
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Screwdriver in the centre and give it a wack inwards
Thanks very much. I also took the pump apart and, although I could not see what was sticking, it worked when I put it back together. Happy days - for the time being !
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It’s a common problem they don’t like not working for months best to turn it on and run it once a month
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