TGannon Posted October 28, 2009 Share Posted October 28, 2009 I've been reading that the only way to have the C4 thermostat is to have a common wire. . .I don't have one of these, I only have 4 wires, see picture attachment. Is it possible to run a C4 thermostat, or should I simply stick with the one that I have? I'm not really interested in running off of batteries and changing them 5 times a year. Link to comment Share on other sites More sharing options...
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