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Posted by HeatPro on December 11, 2008 at 09:29:51:
In Reply to: over presure posted by greg large on December 11, 2008 at 06:26:18:
That is a sign the expansion tank is either too small to take up all the 'extra' water made as it expands, the feed from the cold water supply to the pressure reducing valve is left open with PRV leak-by, or the expansion tank is broken internally.
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