my f24e is now working again after changing the power supply(I thought there might be something wrong with the ring main) but as the temperature increases in the boiler so does the water pressure on the left. what is wrong is it still a water pump issue?
or your aav is not letting air throught find this an turn the little black cap on top of it, hopefully you should get loads of air from it an sort out the problem, if not take ians advised
