While you wait for answers, we may have found some information which could help you.
Success
Message
Unexplained noises?
Grundfos Pump Plan wiring Centre part 96437234?
Grundfos 1550 ch pump installation?
how can I fix my old glow worm central heating boiler model 65-80?
grundfos MK 2 15/50 x 18 playing me for a fool?
baxi 105 HE boiler problem?
Turn dial which way to increase speed?
Heating?
Grundfos UPS 15 45 x18 central heating pump?
Problem after changing ch pump on a grundfos pump plan?
grundfos selectric 15-50?
pump diagram?