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Posted by HeatPro on November 27, 2007 at 21:42:25:
In Reply to: Heatmaker random intermittant overflow posted by Bob on November 27, 2007 at 17:41:07:
Replace the expansion tank.
http://www.heatpro.us/designtree/documents/C50A025C4A1CACEC77F1C2B34CE7FBEE228C9569.html