: Diagnose the thermostat. Look for any heat pump label. Do not move the back wire to the W1 terminal. So, let's see how you can fix it easily. You can choose how much expensive AUX heat your system will use when your. A Nest thermostat will blow hot air on cool mode if you don't have a heat pump. Sometimes systems may need the C-wire to be installed to be compatible. Another possibility is a leak in the ducts. See the two pins on it, that's where the plug goes to energize the valve. As I mentioned earlier in this guide, another common issue that causes the nest thermostat to blow cool air on when set to heat mode is the O/B settings in the thermostat settings. New install of Nest Learning Thermostat and we are getting cold air blowing. This is a perfect troubleshooting guide for you if you are dealing with a Nest thermostat that is not cooling and blowing hot air on cool mode. You could try connecting the black wire to the W1 terminal and see if that changes anything. Then, tap Heat Pump Balance. Connect me with a local heat pump repair person. While you dont want this setting to be on all the time, it doesnt necessarily mean you need to call an HVAC expert and shell out a bunch of money. Manage Settings I've read through the posts but not many resolutions , so would appreciate any help!! Alternatively, get the model number and any other necessary label information on your system and look it up on the internet. However, if the issue has already happened, your only option may be to switch off the heating system and call an HVAC technician. Is it working? With a heat pump system, the yellow wire turns it on or off, and the orange wire changes between it heating or cooling. The same applies to gas furnaces. One system may not need to use AUX heating often, while another system one may need to use AUX to keep the system heating even if the Max Savings setting is selected. Emergency heat is used to give the heat pump a break and avoid system damage (plus, it will warm your home in sub-freezing temperatures). Make sure your heat pump is receiving power and check that your thermostat is set to heat. It would be 24vac if the thermostat is calling for aux heat. So, lets dive into details about why your nest thermostat is not cooling. This will help avoid tripping your thermostats failsafe feature and starting your auxiliary heat cycle. Pull off your thermostats display. If thats the case, you may need to recheck the thermostat wiring. Solution: Theres only one solution here regular maintenance. Well, I don't got much for you then. Auxiliary heat will kick on automatically when the outside temperature takes a sudden dip and your heat pump cant keep up with warming your space. The heat pump is your homes primary heating source, but when the weather gets too cold, a secondary heating source is needed.
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