I have the honeywell rth221b thermostat and coming out of the wall I have red white green yellow and a blue they all match the thermostat except for the blue wire not sure ware to put it the thermostat has a rh rc white green and a yellow ports
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I have the honeywell rth221b thermostat and coming out of the wall I have red white green yellow and a blue they all match the thermostat except for the blue wire not sure ware to put it the thermostat has a rh rc white green and a yellow ports
Blue is probably common, used to run the stat instead of needing batteries
Isn`t really needed if you have a battery operated tstat
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