I have two zones heating my house,all rooms except one does not receive heat. All rooms on that one zone did not receive heat until I removed the air out of that zone my removing many buckets of water,one room at a time started to receive heat. I believe I removed all the air out of the line but no heat on the one room that is on the end of that zone. Thanks===Paul

I have a feeling there is still airin that line. Maybe it will work itself out if you have a functioning auto vent.