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Hi I've had a cp12 gas safe test done on my boiler and it's failed and he's capped off the boiler because he said that the combustion gases are mixing with the air intake. He's not told me what might be the issue though and I'm struggling to find anyone else referencing this as a possible fail...

Hi I have a Vaillant vcw 242 eh, the hot water is working well on it and is getting up to a good temperature to flow rate. The problem i am having is with the central heating. When the thermostat is clicked on it fires up, but if you click it down and then click it back on again the boiler...