Thanks Stephen. Have done lots of bleeding, but the pressure either doesn't go down, or it goes down and then back up. Looks like there's water getting in somewhere, hopefully it's just the loop valve (tho' i suspect it's something bigger inside), I'm going to try disconnecting the top end of the loop hose (if i can) when i get home to see if there's water coming thru there.
Peter
December 2007
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