While you wait for answers, we may have found some information which could help you.
Click here for Hot Water Heatingworcester danesmoor 20/25, lockout/repriming tigerloop and pump?
how do I remove the burner from my Worcester Bosch 15/19 - ?
hot water but no heating?
worcester heatslave 20/25 central heating but no hot water?
Worcester heatslave 20/25?
How to put gas boiler on again after non use? Worcester Junior model?