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Looks like it. Thanks for the help Picasso.

I think so. AAV stopped hissing and the magnaclean on the return is bled.

All valves checked and double checked. Still misbehaving.

Thanks Picasso. I've cleaned out the heat exchanger which was full of stuff that looked like hard limescale. The top half of the heat exchanger was bone dry so I wonder if the water has been blocked from up there and that may be why it's been overheating so fast. All cleaned and put back...

I've run out of ideas for getting our CH system working. Our regular plumbers have been here for nearly 2 days and we still have a non working system. The boiler seems to be stuck in an overheat cycle. It heats, overheats and shuts down for 2 minutes and then repeats. The pump, 3 way valve and...

Hi all, I have a small B&B with 8 rooms and have started to get complaints about the showers. I'm going to get someone in to do any work needed but wanted to work out what's going on. I have a vented HW system that is fed from a tank in the loft of a 3 story building and a pump that...