Hi all, my grandad gave me a call and asked if I knew why he's boiler fan kept running with no demand. As the insides of boilers are not my specialty I thought I'd ask you nice chaps on here. He's got an older style greenstar junior, probably around 8 years old. I said it could be something to do with the pcb but I'd be guessing if I'm honest. Any help would be great and just to recap there is no demand nor has the boiler been used to bring the fan on. I don't think he's boiler has the capability to pre heat the domestic exchanger either.
Cheers in advance
Cheers in advance