VAILLANT ECOTEC BOILER F54, F28, F29 fault codes, what does this mean? And how to fix? Gas Valve? - YouTube
Vaillant F 28 / F 54 - YouTube
Gas valve change on this vaillant today due to f28 and f54 codes! Replaced part everything workingas it should 🔥🔥🔥 #staylit #tidy #plumber #gasengineer... | By stay_lit___ | Facebook