It could also be a malfunctioned fan. when I did that instead of heat coming on cold ai. Only turn your heat up two degrees at a time. Replace single-pane windows with more efficient double-pane windows. When the fuel type is set to electric the blower will start immediately, and cold air will blow out until the heat exchanger warms up. Schedule an appointment with a local HVAC tech. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. You can choose how much expensive AUX heat your system will use when your. Important: Do not touch the wires in your thermostat while you check them. Why is My Nest Thermostat Blowing Hot air on cool mode? Lets find out. Check your equipment type under settings. Nest thermostat Heat Pump Balance settings are for systems that have a heat pump and auxiliary (AUX) heat. Although its not common, its also not unusual for auxiliary heat to misbehave or fail. If its an electric resistance coil heater, have an HVAC technician check and test it before the heating season begins. Although some auxiliary heaters are built into the heat pump, they have separate wiring and function differently. If the O option is highlighted, select B. Nest thermostats are great devices, but sometimes problems can arise. One your thermostat wire(orange wire) is broken or open. You can set a lockout temperature manually in the Equipment menu of your thermostat. Auxiliary heating is dependent on a couple of factors, one of them being that indoor temperatures must be higher than a specific setting usually 40F. To transfer heat from one place to another, the refrigerant flows back and forth from the indoor unit (your air handler) to the heat pump condenser (your outdoor unit). Its not advisable to attempt DIY on auxiliary heat systems, especially gas heaters. Also, the white wire on the thermostat was connected to W2, but inside the air handler this wire goes to W1? If your system blows air through vents in your home, you have a forced air system, but you may not have a heat pump. A changeover valve is a device in your heat pump that reverses the flow of the refrigerant so your heat pump can function as both a heater and an air conditioner. Remember, your emergency heat is not automatic and will require you to physically turn it on and off. If your system starts to blow cool air when your Nest thermostat is in Heat mode (or if it blows warm air when its in Cool mode), change the settings for orientation of your heat pump. Possible Conclusion 3: Your Heat Pump Is in Defrost Mode. Before we jump into what auxiliary heat means, lets talk heat pump basics. If you have a single stage heat pump, wire it accordingly. Thermostat shows auxiliary heat and blows cold air
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