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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

Sorry should have said, runs at top speed constantly, even when there is no demand for DHW or CH.

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 Thanks for the great responses. Is the intermittent flow thermistor the same as the Primary temp. sensor? About 5 inches below the overheat stat? Regards Update Turns out it was the primary heat exchanger - as per the 1st response. Many thanks all Sunny

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...