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Posted by Harold hydronicnetwork.net on January 31, 2004 at 07:18:46:
In Reply to: valliant only heating ground floor posted by paul on January 31, 2004 at 02:26:46:
Some information about how the system is piped inciruits might help give clues as to the reason. the most immediate cause would be a circulator that is not working or a valve that is closed.