B
brightcrow
I've lost count of the number of jobs that I've been to that have been reported as a faulty 3 port valve because the rads get hot in the summer. I think I've had a couple in 28 years where it was a faulty valve, most of the time it's an incorrect cylinder return. The favourite one is where the boiler has been relocated into the airing cupboard and the cylinder and heating returns flow into either end of a tee with the return to the boiler in the centre. It just screams reverse circulation to me.
The best one I had was where a system had been re plumbed because the pipes under the concrete floor had burst. The cylinder return was connected to the return furthest from the boiler. This was reported as a faulty 3 port and I had to run a complete new return from the cylinder back to the boiler.
Hey Mike,
Now was that a w/sure diagnosis by any chance LOL