boiler firing

Hi everyone, William here from Cumbria, originally from Essex, Chelmsford. I moved in to a new house about 2 years ago which has a worcester greenstar 30cdi fitted. It's a 5 bed house so plenty powerful enough for the property. Ever since we moved in the boiler which is in a cupboard in my...

Apologies if this issue has been covered. I searched but couldn't find anything specific. I've got a Sime Format 80c Combi boiler, not sure when installed (previous owner) but at least 4/5 years old, that's developed a strange fault in the past couple of weeks. Whenever I switch any of my hot...