Refer to the S-plan wiring on the Honeywell link posted by Set Square.

If the valves are moving, the fault is probably with the micro-switch
(2 grey wires from terminal 1 live to microswitches, 2 orange wires
from switches to terminal 10 on the Honeywell schematic; terminal 10
provides a live feed to the pump and boiler). Your terminal numbers
won't necessarily correspond to the arrangement shown.