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Posted by HeatPro on November 15, 2007 at 23:21:35:
In Reply to: Re: How to stop the hammer ? ? posted by Bill on November 15, 2007 at 22:46:32:
Not very easy to find it out; but if you see wild action in the sight glass when the boiler is set no higher than 1 psig, that's a good clue. The cure is to do a skim of water off the top of the boiler. See a pro for that.
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