My central heating isnt working please help

from that valve is a cable that has 5 wires they should go into a wiring centre.
you need to check to see if the white has got mains power on it.
be careful cause you have to check this will the power on.
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so that proves the wall stat is calling for heat.
and the cylinder stat is satisfied/or off.

turn the mains power to the heating system off then that will reset the valve it should fall to the W position.
now switch mains back on.
and heating only at programmer wall stat up.

what does it go to ?
sounds like its knacked.
it should pull right across to the H.
you got all power in the right places.
so i would say the board or somethings gone inside.

you can remove the top plastic cover and see if you can see anything maybe burnt out.
100% everything proved ok apart from the valve not moving.

you only need an actuator not complete valve.

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