While you wait for answers, we may have found some information which could help you.
Click here for Baxi Boiler FindGrundfos Pump Plan wiring Centre part 96437234?
baxi 105 HE boiler problem?
Grundfos 1550 ch pump installation?
grundfos selectric 15-50?
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?