Honeywell zone valve

But, did you do as Matt said, and check whether the overheat stat on the cylinder has tripped. If it has it would give the exact symptoms you have.
One further point is taping a wire that is live (it will be live when the motor is not energised) is not considered making safe, it should be wired into a spare terminal/choc block.
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The reason why I say about the white is because the new actuator once installed did nothing. put clock on to call for heat, cylinder cold so stat would be calling for heat and nothing happened, no energise of valve, no pump start up and no boiler fire up. Put old actuator back on and back to old symptom of pump running and boiler fire up with programmer off.

but the old actuator has a faulty switch
Is the old actuator motoring? if so and the new one isn't, and you are not mixing up brown and orange then yes the new one could be faulty
doubtful but not unheard of
but as said, a proper means of testing for mains voltage on brown and blue would be decisive

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