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Posted by tom on December 29, 2007 at 06:31:11:
I have a 7 zone weil mclein oil boiler system. All seems fine except one zone seems to maintain heat when thermostat is shut off.
Is it possible for the taco recir or a relay to fail closed so the cirl. stays on. It is the only one out of the 7. I have felt return and feed side of that pump and they are warm compared to the other 6.