Hi, following on from a previous post, my gas boiler (potterton netaheat
10-16) provides hot water but it doesn't seem to heat the radiators. There was a new towel rail installed recently which introduced some air into the system, after a week or 2 the rads stopped heating up.As suggested I bled the radiators and a lot of air came out of some of them however upon turning on the boiler still no heat in the rads. The pump hums quietly so i assume its running and it gets quite hot to the touch, but would this need to be bled too?
Any help on what is at fault here is much appreciated!