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:? I think this IS the motorised valve? Its a small silver box in the airing cupboard..with a lever that 'moves' from right to left. I think right the valve is open....left closed. The central heating system runs off oil. The boiler is... Merlin Model No. 45/65 65/95 100/150 150/185...

If the timer is set to twice - when the designated time arrives, you can hear the whir of the pump (or whatever) starting up...the HW and CH appear on the timer. SOMETIMES the heating/hot water works...other times it doesn't although you're still hearing the noise. Other times...it will start...