While you wait for answers, we may have found some information which could help you.
Click here for Problem After Ch PlanGrundfos UPS 15 45 x18 central heating pump?
Grundfos Pump Plan wiring Centre part 96437234?
Unexplained noises?
how can I fix my old glow worm central heating boiler model 65-80?
baxi 105 HE boiler problem?
grundfos MK 2 15/50 x 18 playing me for a fool?