Quick brief - Hot water and central heating won't send a signal to the boiler to turn it on!! The pump runs and the controller lights are on but the boiler won't ignite. Have had a new controller in the airing cupboard and circuit board in the boiler fairly recently.
Can a faulty actuator stop the signals being sent to the boiler? For a while the pump over-run hasn't stopped after they've been turned off so I've had to turn it off at the mains but today it's stopped working altogether,