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Thanks for your reply - I appreciate your points. Further to my earlier post, rather oddly, despite not firing the boiler seems to think there is a demand for hot water (i.e. the DHW light is on) when all taps are off. Also, despite having not fired both the pump & the fan seem to run all...

Hi there Got a Vaillant Turbomax 242e. I noticed the rads had gone cold early tonight so ventured upstairs to check boiler & discovered it wasn't firing. Switched it off & on & discovered that the fan light blinks on as if it's going through the normal firing procedure but doesn't stay...