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Thanks for your input here, i'm going to leave the boiler on constant overnight but the radiator dial to off to see if it still produces hot water in the morning. will this prove anything? Expect I'll still have to phone an engineer though.

It seems to fail at the end of the reset attempt, i can here the fan kick in but on it's third attempt it goes to lock out so i have to restart the reset procedure. What is the PCB? Any idea on cost here? My gas supply is ok as far as I know, i have a gas hob and not noticed anything with...

Hi, My Vaillant Turbomax Pro 24 e combi has for the second time in 2yrs had this problem. Lockout light lit hence no heat or water. Last year the boiler had a new airpressure switch fitted costing £140 by an engineer, also had a new gas control section costing me £231 6 mths later. Its...