How Do You Troubleshoot A Thermostat Y Wire On An Air Conditioner?
The AC portion of your heating, ventilating and air-conditioning system is controlled by the thermostat and the Y wire. If your system is not turning on or off at the desired temperature, the problem could be in the thermostat or the Y wire. Once you know how to troubleshoot the Y wire on an air-conditioning system, you will be able to determine where the problem is located. Check the transformer to see whether it has power. The quick way to perform this check is to set the fan mode to “on” at the thermostat. If the fan comes on, the transformer is getting power. If the fan does not come on, the problem is in the power supply and not the Y wire. Disconnect the power to the HVAC system by turning the circuit breaker off to the system at the home electrical box. Use a flathead screwdriver to pop the face cover off of the thermostat. There is a slot between the face of the thermostat and the thermostat body for the blade of the screwdriver. Use a Phillips-head screwdriver to unscrew the m
