i have a potterton envoy40 and its been running fine and now wont light?
hi i have a potterton envoy 40 combi boiler its been working on constant for a week my partner turned it to twice aday and now it wont work at all just flashes 9 i would be great full if some one could help me and tell me what the nine is for and what could be wrong with it thank you kirsty