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I got it wrong. The burner is firing up and showing S7. Just goes to show how much you need to know before attempting diagnostics.

Cheers Tony Code when 'i' pressed is S.07 - Water pump over run. Normal when pump is on to heat water to rads. S.08 - Anti cycling mode when pump stopped. Also normal.

Vaillant TurboMAX Plus Combi Boiler is not switching off as per the settings on the timer switch. It's working perfectly okay apart from that. Turns on as per timer settings - doesn't turn off. Is it anything more than just a faulty / broken timer switch? Is there a simple rectification of...