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Posted by HeatPro on December 29, 2007 at 07:10:54:
In Reply to: zone wont shut off posted by tom on December 29, 2007 at 06:31:11:
It is possible for the flow control valve (heavy check valve against gravity flow) to be turned open, stuck open, or have extreme gravity flow.
http://www.heatpro.us/multctree/documents/EFC1A42B3F19738B04E1C358E0FB27AF988B5ADF.html