Vaillant fault codes - Vaillant Boiler Repair Service
Hana K Plumbing&Gas on Twitter: "Has anyone had a Vaillant boiler die on them whilst servicing? Turned it off, turned it on and this happened. Display showing COM, display going 😵😵😵 Ended
Vaillant ecoTEC plus 428 f27, f64 & CON error | DIYnot Forums
Boiler - Código de error
Vaillant ECOTEC Plus 831 Con fault - Vaillant Boiler Repair Service