Hi guys,
A couple of months ago we had a new boiler (Potterton Suprema condensing) installed. Since then one of our 12 radiators has been pretty much stone cold. The only way we have found of making it work is by turning off all the other radiators - that makes it piping hot.
The plumber who installed the system has been back a couple of times but failed to fix it. He is convinced there is a blockage and therefore replaced some piping today. I can't understand how it can be a blockage if it works when we turn off the other rads.
We've had some advice from a maintenance bloke who did some tiling for us. He said the pump is set to high and that by default a new pump would be set to medium on the basis that it would go to high when an extension/more rads were added to the system. His suspicion is that the pump is not powerful enough - the installer disputes this.
Any comment would be fantastic - I am a complete novice when it comes to these issues. One thing I note is that for the rad in question one pipe feeding it is hot, one cold. We have tried putting cleaning agent through the system. Another thing to note is that the boiler was moved to our garage from the kitchen which has added quite a bit of pipe length to the system.
Thanks in advance, James.