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Thanks Chris, The lock valve is working fine as I bled off of that one as well with the TRV closed (didn't mention it in the previous post). If it is a balancing problem is it an issue that the rads have normal open/close valves rather than lock valves?

Hi thanks for ideas, I have closed off the lock valve and TRV, I then bled off the pressure and opened the TRV, nice clean water flowing, so TRV working. Next, I shut off all but two rad's (too much trouble to get to them) and the new rad heated up fast and fully. I have opened the...

Hi, I have added a new rad to an existing pressurised system. I had to run the 15mm pipe 10' upstairs to cut into the existing pipes as I could not dig the floor up to reach the downstairs rads. I have T'ed into the flow and return feed to a rad upstairs. The problem is that the new rad...