Some heat pump systems include a feature called Emergency Heat that can be manually turned on if the primary heating system isn’t working or keeping your home warm enough. The best way to prevent AUX heat problems is to take great care of the HVAC unit. On the Nest Thermostat: Push the Thermostat > Turn the outside dial clockwise to Mode > Push the Thermostat again to select to turn the heat on or off, depending on which setting it is on. You all helped me a few months back when my heat died. EM heat is NOT the same thing as AUX heat: AUX heat signifies that your heat pump has automatically switched over to backup heating because temperatures are too low. It has been driving me crazy. 3. Add a few layers to your outfit or sleep with an extra blanket to keep your furnace from working so hard. We are experiencing longer than normal wait times for support. This option will only appear if your system has Emergency Heat. This includes auxiliary heating system components. Our suggestion would be to reach out to a professional as soon as possible. When the Nest first came out (and was quickly swooped up by Google), not a lot of people were sure what to do with it. As we mentioned above, AUX heat usually costs up to 50% more than heat transfer, which means if your system is running on AUX heat when it shouldn’t be, your heating bill is likely going to be a lot higher than you’d like it to be. Your heat pump’s manual or manufacturer says your model has it. When switching your unit to emergency heat, you’re forcing the backup heat system to do all the work. Discussion on Google Nest products, including installation and configuration. If the home temperature goes down one, or sometimes two degrees, this causes the thermostat to bring on the auxiliary heat for a very short boost to supplement the heat pump. Open the Home app and tap your thermostat. You can manually turn on Emergency Heat on with your thermostat. If you there are no wires in the O/B connector or W1 connector, make sure they haven’t come unplugged. The app will ask you to enter the wires on your current thermostat. In case your heat pump isn't working correctly, you can select to always use alt heat.This video introduces 2 method to force alt heat to turn on.1. I frequently set the Honeywell TH8000 from 58 to 61 degrees at random times and to keep the aux heat from kicking in I have to setup the thermostat up 1 degree at a time. If there's a wire in the W1 connector, make sure it says, If there's a wire in the O/B connector, make sure it says. As long as there is a spread of 4+ degrees it will turn on. Does it stop if set to 65? Which is 1.5 to 2 degrees lower than thermostat set point - the electric heat or auxiliary heat would then come on to make up the temperature difference. If the fan does not turn on, stop the test immediately. So it relies on an auxiliary (AUX) heat coil (like the ones you see in a toaster) or a furnace to heat your home. The minimum is -25, and you can adjust it up to 32. Emergency Heat is typically triggered when it is 35°F and below outside. Your auxiliary heat, as just described, supplements your heat pump’s heat when it needs it. Last year I also had a Rite Temp t-stat that did not use the aux heat nearly as much as the current honewell. Nest tries to heat a couple degrees past the set point and then shuts off. Once the ice on the heat pump has mostly melted, the heat pump goes back to normal and AUX heat turns off. But if you need to run it regularly, your system may need servicing from a qualified HVAC technician. Note: If Alt heat (not AUX heat) appears, your Nest Thermostat E is configured to work with a dual fuel system. Double check your wiring diagram and that the wires are in the correct connectors on your Nest thermostat. Get an answer from an expert on the Google Home Help Forum. Auxiliary Heat. For example, if your AUX lockout temp is 40ºF or 4.4ºC, then AUX heat will come on when the outdoor temperature drops below 40ºF or 4.4ºC. My Nest 3 seems to ignore the aux lockout even with safety temps disabled. Then it will give you a Nest thermostat wiring diagram that’s customized for your system. Once you're sure, you can assume that the X is the auxiliary heat and should be inserted into the AUX/W2 connector on the Nest Thermostat Then from the thermostat itself, go to Settings/Equipment/Continue/Continue/Heat Pump/Press whatever is currently selected, Now you come to the setting: "Use the heat pump compressor when the outside temperature is above". The site may not work properly if you don't, If you do not update your browser, we suggest you visit, Press J to jump to the feed. It's the max temperature to allow AUX Heat to kick on. Temps right now are around 20 at night and 30-31 during the day. Knowing the difference between your heat pump’s auxiliary heat and emergency heat will help address the question from above. Moving heat- In heat mode, your heat pump is like an air conditioner working in reverse to pull heat from the outside to inside your home (the opposite of how it works in cooling mode). My heat pump will now always run AUX heat whenever the outside temp is below 30, use assisted AUX heat from 30-40, and use only the compressor above 40. Some heatpumps can take longer than others to warm up and finally start giving heat. turn on the fan and after a minute or two you should feel distinctly warm air coming out of the vents. The Nest Thermostat is pretty easy to use, but it isn’t so apparent how to turn off the thermostat when you don’t need heating or air conditioning on.. RELATED: How to Install and Set Up the Nest Thermostat Sure, you could just set the Nest to “Away” to stop it from heating and cooling, but that won’t work very well if you have Home/Away Assist enabled. Once it gets close to the actual setpoint, the aux heat de-energizes and the heat pump mode of the system remains operating to generate heat and will shut off if the temperature is satisfied. I did all the correct wiring hookups and tests to confirm initial operation. If you there's no option for E: Emergency, the Nest thermostat does not detect an O/B wire. You’re a wonderful human being for sharing this. In either case, you should have a professional assess the situation. 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