Youll stay warm, but emergency heat mode will cause a noticeable spike in your electricity bill. Its not advisable to attempt DIY on auxiliary heat systems, especially gas heaters. Scan this QR code to download the app now. Also ensure that the wire is exposed enough (1/3-/1/2 inch). Easy fix! Nest thermostat cold air blowing when heat setting is on Ruud vs. Goodman: Which Air Conditioner is Better? Changing orientations between heating and cooling depend on your heat pump model. You'll need to manually set the / OB connector as your second. How old is your system? Read also: Honeywell Thermostat Blowing Cold Air on Heat Setting [Fixed]. 2) Incorrectly Configured Reverse valve. I need assistance with my thermostat. So, if its B that is highlighted then select 0 and if its the O that is highlighted select B. Give auxiliary heat time to work its magic. Nest Says It's Heating But It's Not? (Possible Causes & Fixes) If you have wires in both the W1 and W2 connectors of your Nest thermostat, your system is a dual fuel system, and wont use Heat Pump Balance. Do not turn on emergency heat unless its actually an emergency. If O is highlighted, select B and then try to call for heat. Keep your home at a steady temperature and your heat pump from putting in extra work by properly sealing your living space from the chilly air. O/B and Y control your first stage heating for heat pump systems. I did follow that diagram. I think it has to deal something with the change valve like the previous commenter said. Now that we know where this problem lies- let's take a closer look at what may disrupt the ignition process. A heat pump warms your home by pulling in heat from the outdoors, but it can also cool your home by expelling heat from your living space to the outside. I could be wrong as I know nothing about hvac systems. Your heat pump will defer to aux heat on its own when the temperature is too cold outside for the unit to warm your home to the desired temperature. If this terminal is loosely connected or not connected, it will cause problems with your thermostat controlling heating and cooling for your heat pump. When temperatures outdoors drop below a critical balance point, the thermostat sends a signal for the secondary heat source to come on. For a 1st stage heat pump, these are the terminals that are supposed to be connected. It could also be a malfunctioned fan. Read also: New Honeywell thermostat blowing hot air on cool. 2023 householdair. If thats the case, you may need to recheck the thermostat wiring. Ice can form when there is a problem with your heat strips, which work to keep your equipment defrosted. 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. Choose between Max Savings and Off. https://www.hvac.com/troubleshooting/what-temperature-thermostat-in-winter/. If its a gas furnace, there could be an issue with the gas supply. Also make sure the nest is set to not use auxiliary heat. Also noticed, as im walking up the screen display goes to blue for cold air, but literally only for a milisecond, then to black background with normal white numbers; again with air still blowing for almost 5 min. Is it working appropriately? You have a conventional system and not a heat pump. Youll pull the wire from the G terminal and put it on the C terminal of your thermostat. AUXheat can cost about 2to 5times as much as running your heat pump. With the old thermostat, heat works normally (even in the 10-20F outdoor weather we are currently experiencing).
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