Hi Andrew as far as I'm aware it is the problem is that the pump keeps coming on without the motorized vavles open which causes the pump to make a lot of noise.
The pump is ment to cut in occasionaly even when the boiler is in the off position but now it is cutting in all the time.
I have already checked that the micro switches are going off when the valve closes.The indicator which comes on when the micro switches are on doesnot come on which indicates the micro switches are not the issue unfortuanately I can't get any information on what tells the pump to cut in from Redring who have supplied the boiler.
yes the pump is in the boiler enclosure
When I was there no lights flashed but I have only been on site once when the pump was running the only other thing that could cause the pump to cut in is one of the boiler sensors I have called Redring to aske which sensor would do this but they haven't replied.