DIY Doctor UK DIY Forums

I have completed my S plan heating wiring system. The hot water and heating motorised valves both work correctly when demand is needed. When no valves are calling for heat, the boiler pump still runs and when the boiler temp drops it fires to maintain temperature, can anyone help??

Normally boiler and pump come on together, the thermostats work the valves, and the valve micro switches work boiler and pump.