Can anyone tell me what is faulty on my boiler, the pump does not stop running even without any demand and about 10mins after the end of demand or thermostat reaching the desired temperature the boiler starts to make a lot of quick noise that only stops once the power has been turned off? 
I have dropped the control box down and the noise is coming from the controls or coils mounted on the PCB but still only off demand.
I have dropped the control box down and the noise is coming from the controls or coils mounted on the PCB but still only off demand.
