Alas he did come back, checked it - said it was nothing he'd done (didn't notice the valve was closed). Only when I got a plumber mate round to check it was noticed when he put the pipe back to its original position.
Original guy moved the inbound water-feed to the system (which was...
Hi - new guy here and need a bit of advice.
Just had a new condensed boiler fitted for traditional central heating/hot water system and I think the installer screwed up.
He wanted to change the feed from the expansion tank to a different pipe. Don't know why and I've changed it back now...