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Nope, just me not looking at the forum properly.. Got to be a partial blockage somewhere if it was the rectification you would expect it to do it on water as well. Is the heat ex noisy with the heating on?
Can't be main hex as hot waters fine
Pop the bleed screw out when it's running and get an old flat headed screwdriver and pop it in the hole and apply medium ish pressure if it stops the pump isn't strong enough to push the system water around