Why Your AC Won’t Start When the Thermostat Is Off: Checking the Red Wire Power
When your air conditioner won’t start, it’s easy to blame the thermostat. Sometimes the thermostat is the problem, but a loss of low-voltage power can shut down the entire HVAC control system. One of the first things to understand is the thermostat’s red wire, commonly labeled R. This wire supplies approximately 24 volts AC from…