Question about Honeywell Heating & Cooling
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Posted on Jan 02, 2017
with y plan 3 connections on programmer HW on HW off CH on HW on to cylinder stat then HW call to Orange on Mvalve to power boiler and pump HW off to grey wire on Mvalve to close hot water CH to room stat common then heating call to white on Mvalve
Posted on Aug 17, 2009
This does not sound like a thermostat problem. I would be looking for a zone valve or circulator pump problem.
Posted on Nov 12, 2009
I would check the batteries in the thermostat. If the batteries are okay then you might have a blown fuse in the furnace or the furnace lost power check the breaker.
Posted on Jan 21, 2010
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