An actuator/diverter valve is a part which uses a form of power to turn a control signal into mechanical movement. Actuator is the main device in heating/boiler system. They typically runs on electric or pressure.
What happens If my boiler acutator/ diverter valve is failing?
The most common symptom of a faulty diverter valve is when you don't get any hot water to your taps which means that the boiler isn't giving the hot water to the fixture in use, The reason is that the diverter valve is stuck open and the heat is escaping off. Loads of hot water, but no heating.