EWC Controls Forum

Eric, Thanks for you response!! So am I to assume that if the thermostat is wired with 6 wires rather than 3 it is the master?? I have one master zone where the fan will not shut off in the auto or fan mode whatever temp is set. I have two zones that the fan mode works but not the auto mode when ...

Hi EWC, I had a Ultra-Zone model EWC-ST-2C installed with four zones running. I assume after reading your site, two have dampers and the others are the masters ??? Anyway, four Honeywell Chronotherm 3 Thermostats are installed. Heat and air work fine but the fan will not auto. Fan works as designed ...