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There is no + and -. The pumps live should be connected to the cylinder stats call for heat connection as it directly switches the pump and boiler on.It appears the pump + also has a - connected to it that goes to water thermostat. Don't know if that's correct.
The valve may hum gently as when the motor has reached the correct position, as it is still powered, but stalled. Your fault is almost certainly a pluming/installation issue rather than electrical. Even if the valve was dead or stuck the water would still flow through it. (assuming the flow path wasn't blocked with debris of course)And this box is buzzing
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