Down to a certain temperature, there’s sufficient latent heat in cold air to maintain indoor temperature settings. Your display is working correctly and exactly as it is suppose to. The short answer is that auxiliary heat and emergency heat refer to the same thing, and are somewhat interchangeable. In emergency mode, conversely, the heat pump function is totally disabled and the system relies entirely on secondary heating coils. Mine is not Honeywell, so check your instructions. Auxiliary heat is automatically activated when there’s not enough outdoor heat. As outdoor temperatures rise and secondary heat is no longer required, the unit automatically turns off the auxiliary electric coils. What Is Emergency Heat? In fact, many people get auxiliary heat confused with emergency heat when they are actually quite different. **Note that if your Emergency Heat light is on but your thermostat is NOT set to Emergency Heat, this is an indicator there’s a problem with your heat pump and you should call for advice and service. E: Emergency heat (In emergency mode "Y" is not energized and E is energized to indicate the need for emergency heat. No-frills heat pump systems without the auxiliary heat capability sometimes make that feature an add-later option. Therefore, if it’s below 40 outside and the auxiliary heat isn’t working, then your heat pump will just blow lukewarm or cool air. If you haven’t had that check done in a while, give Scott’s One Hour Air Conditioning & Heating a call at 813-882-4776. Note that auxiliary heating is not the same thing emergency heating (displayed as “EM HEAT” or “EMER” on most thermostats). If this happens, the heat pump and heat strips will run together to create warmer air to more efficiently heat the home. Heat) on will turn off the heat pump and run the auxiliary heat only. This means, when the temperatures start to drop and your heat pump cannot produce enough hot air to warm your home the aux heat will turn on. The first function is to back up the heat pump if the thermostat has a difference of 3 degrees or more from the set temperature to the actual temperature inside the home. Emergency heat is when you turn on a secondary heat source manually. Both forms of heat are the exact same heat … Here in Florida, we typically use the heat pump for our primary source of heat when heating the home; however, this unit also has a limit. When the UI calls for heat and the furnace is brought on it reads Aux Heat because that is the heat source it is running. This mode is used if the heat pump fails during cold winter temperatures and the compressor must remain off.) At temperatures around 45 degrees, the outside coil can and will freeze up, which will cause the system to go into defrost mode. This heater is the exact same heater as the auxiliary element, only used in a different format. Both forms of heat are the exact same heat elements but are labeled differently. Emergency Heat is when you use your supplemental heat (2nd stage) by itself, without the use of your heat pump (1st stage heat). ** Auxiliary Heat. The second function is when the outdoor system goes into defrost mode, as stated above. Homes with heat pumps are equipped with a two-part system: The heat pump, which is the outdoor element, and the auxiliary heating source, which is the indoor element. As temperatures drop further, however, the heat pump may not extract enough heat. C: Common. When the heat pump outside is not working, and you run the risk of damaging it more by continuing to use the unit, switching the Emergency Heat (Em. As the name indicates, auxiliary heat, or emergency heat depending on your system, is just a secondary heat source. Auxiliary heat is when the secondary heat source turns on automatically. By losing the emergency heat function you can NOT switch to just aux heat if the HP ever has a problem. When you need heating or air conditioning repairs, maintenance or system replacements, you need a company you can count on for dependability and quality service. To summarize, while these terms can be used interchangeably and refer to the same type of heat, auxiliary heat is when your heat pump’s heat strips turn on automatically. Heat pumps don’t generate heat with a burner flame like a gas-fired furnace. This heater is an electric heater similar to a toaster oven and will supply supplemental heat to the home while the outdoor unit is defrosting itself. How to Maintain Good Airflow in Your Home, From Heating to Cooling: To-Do Before Turning on Your Air Conditioner. While auxiliary heating indicates that your heat pump automatically switched from normal to auxiliary heating, emergency heating is a setting that allows you to manually set your system to auxiliary heating. For more about understanding the auxiliary and emergency heat mode for your heat pump, contact the professionals at Jackson & Sons. The system continues to operate in emergency mode until the user manually turns it off. Although heat pumps are commonly used in houses around the country, many homeowners don’t fully understand what auxiliary heat is. Our professional team of technicians look forward to providing energy efficient and cost effective solutions to keep your home or business comfortable at all times. When the heat pump can no longer maintain the desired temperature setting, then the auxiliary heat must come on to assist. Auxiliary heat/emergency heat will come on when the heat pump is … Emergency heat is a mode the user manually selects if the unit is not providing any heat for some reason such as a malfunction. The difference between auxiliary and emergency is only that the compressor (heat pump) is locked-out from running in emergency mode. Note: If Alt heat (not AUX heat) appears, your Nest Thermostat E is configured to work with a dual fuel system. When that happens, your system switches to emergency heat, otherwise known as auxiliary heat. Emergency heat is when the heat strips turn on due to you manually selecting the emergency heat setting. When outdoor temperatures drop below the tipping point, heat pumps offer two options: auxiliary heat and emergency heat. Electric heat strip - This electric heat strip is auxiliary heating (or “aux heat” as it shows up on your thermostat). Once the outdoor system is defrosted, the auxiliary heater turns off and the system continues in heat pump mode. Emergency heat is a mode the user manually selects if the unit is not providing any heat for some reason such as a malfunction.
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