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vaillant turbomax plus 824e combi boiler, fine on HW but fires for a few seconds on CH demand temp runs up to 86 then flame dies. Any ideas

Hi All The fan on the boiler runs constantly, have to switch it off at the spur to stop it. Boiler won't light but pilot lights fine. Any pointers Thanks

Hi My Alpha 240X is playing up. When you first turn on a HW tap, the boiler will ignite and heat the water. After a couple of minutes the gas goes off, and won't go back on until the water cools and you shut off the tap. Much the same with the Central heating. I recently changed the...