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Thanks Mickyg, that was one thing we were looking at in the manual so it's extremely helpful to have your input. We'll try this and report back.

Same as when a car has an intermittent fault and the professional response is 'dunno': it costs a fortune in labour time while the expert scratches his head and does little else.

Hi people, our Vaillant Ecotec Plus boiler is failing intermittently with no fault code, and looks like costing a fortune and an eternity to diagnose and fix. I'm hoping that someone here can point me in the right direction for diagnosis before I freeze. Symptoms: heating fails, sometimes...