While you wait for answers, we may have found some information which could help you.
Click here for Burner Boiler Lockinghot water but no heating?
whats wrong with my Worcester Danesmoor 12/14?
worcester danesmoor 20/25, lockout/repriming tigerloop and pump?
worcester heatslave 20/25 central heating but no hot water?
how do I remove the burner from my Worcester Bosch 15/19 - ?
Worcester heatslave 20/25?