Old Thermostat Has No Labels

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The wiring labels on the old thermostat do not match up with the ones on the new thermostat, or the alternatives suggested in the new thermostat's setup guide. The old (current) thermostat has these wires: Whenever your thermostat calls for cooling, the y wire is used to send a signal to your hvac system telling it to fire up the air conditioner. A high level for extremely hot or cold days, and a low level for mild days).

Wiring for a new thermostat with labels [ 8 answers ] hi! I am trying to install a hunter model 42999b thermostat. The wires were not labeled and does not correspond to what hunter has. I have green, white, red, yellow, orange, and blue wires. The box has letters of w2, o, g, c, y. Ecobee thermostats do not support three stages of cooling. Old thermostat has no labels. Try removing your thermostat by first tilting the bottom up toward the ceiling. If no labels are provided, use masking tape.