If its not a heat pump- check the white wire connection on the thermostat. If it IS a heat pump, check the blue wire connection on the thermostat. Both of these wires control the heat in their respective systems.
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If its not a heat pump- check the white wire connection on the thermostat. If it IS a heat pump, check the blue wire connection on the thermostat. Both of these wires control the heat in their respective systems.