I have the above boiler and am having problems with the heating, hot water is also 'steady'.
The room stat and programmer are all calling for heat, the pump is running and the diverter is open but the boiler won't fire.
Hot water....is fine with the tap half open, full flow = cold and it sometimes causes the overheat to trip resulting in me going out to the boiler to reset it.
I have had a look inside and tested for power to the heating stat on boiler and have no live, tracing this back I get to an overheat stat(?) and another stat and have no lives at these either, I have also noticed some scorching above the neutral terminal on the room stat conn. block with no neutral connected. Another point is that the boiler hasn't been regularly serviced throughout it's life.
Can anybody point me in the right direction as to which part is faulty please?