The Auxiliary heat will be coming on now and then when 1. If your heat pump seems to be stuck on auxiliary heat mode and the temperatures outside are above 35 degrees, you should call the professionals at Precision Heating & Air. The app will ask you to … The heat pump is getting too cold outside and needs auxiliary to back it up 3. the Heat pump has gone into defrost mode, (cooling) to melt the ice of the outdoor coils. 11-26-2010, 10:48 PM #5. hedtedjr. The cheap builders at my new home, put a gas furnace in for the first floor (zone 1) , and a heat pump for the second in third floor (zone 2). When your heat pump can no longer pull the necessary heat from the outdoors, your auxiliary heat will automatically jump in to help. If auxiliary heat is not working: Verify the setpoint and ambient temp at the thermostat (remembering the swing setting). Many of these are particular to more sophisticated high-efficiency condensing furnaces that use electronic ignition, and most homeowners prefer to call a service technician to deal with them. Prolonged use of aux heat can cause your utility … To clean the sensor, turn off power to the furnace at the breaker box. Use the button to highlight the MODE & FAN SETTINGS menu and then press the button. for a detailed diagnostic procedure. From what I have read the Aux heat strips are supposed to turn on when this happens so cold air isn't blowing into my house. Auxiliary heat kicks on when your heat pump can’t produce enough heat to warm your home by itself. Most of the time the G green wire is used to energize and start the indoor fan blower motor. To prevent this, the auxiliary heat turns on and heats the air coming out of the vents. Using a heat pump for cooling and heat down to about 40ºF works well but when the weather gets colder a back up auxiliary system -- preferably gas or oil -- … A less likely, but possible, cause of "no heat" on a heat pump system is a bad thermostat. When the heat pump can no longer maintain the desired temperature setting, then the auxiliary heat must come on to assist. If the heat pump is unable to produce sufficient heat to satisfy the thermostat temperature setting, the auxiliary heat (2nd stage) is activated to work in conjunction with the heat pump. Verify thermostat configuration, especially for heat mode, and verify it is configured for auxiliary heat. Suggestions? It is not uncommon for control boards and sequencers to fail over time. Besides a low temperature, your heat pump also goes onto emergency heat if … Emergency Heat must be turned on manually while Nest thermostats can use Auxiliary Heat automatically as needed. 8 Common Problems With Conventional Gas Furnaces, Troubleshooting an Electronic Ignition Furnace That Won't Light, Troubleshooting an Intermittent Pilot Ignition System, How to Light the Standing Pilot Light on a Gas Furnace, How to Troubleshoot Electric Ignition Furnace Problems, How to Replace a Furnace Thermocouple or Electronic Flame Sensor, How to Check a Pilot Light on a Gas Furnace, Troubleshooting Common Problems With a Gas-Fired Hot Water Boiler. Here, we list some of these causes, and offer repair tips to solve these no-heat issues. Finally, reattach the sensor and restore power to the furnace. Look to these possible causes one at a time. This situation isn’t very common in Arizona, but colder-than-normal weather can sometimes happen. All air handlers have some type of control to energize the auxiliary heaters. This button controls an automatic shut-off feature that shuts down the furnace if it gets too hot or if there are other problems. Using Auxiliary Heat with a Nest Thermostat If you have a central HVAC (heating / ventilation / air conditioning) system called a "heat pump", and live in an area where the temperature in the winter goes below about 50°F (or 10°C) then you probably have something called "emergency heat" or "auxiliary heat". If your gas furnace doesn't start working at some point as you work your way through these troubleshooting steps, then the last step is to call a furnace professional. Broken reversing valve: As the name suggests, the reversing valve allows the heat pump to work as both a heater and an air conditioner by reversing the direction of the refrigerant. Heat pumps operate via a refrigerant that absorbs temperature from the Earth’s atmosphere. Invest a few dollars in new high-quality air filters before you try anything else. Types of AUX heat (and why it matters) Heat pumps have 2 forms of AUX heat: Electric resistance (default) Gas furnace; The electric resistance option is like the electric coils you see inside your toaster. If the outside air temperature is above this point, a heat pump failure may cause "no heat". NO HEAT – The space temperature drops more than 3 degrees below the thermostat's heating setpoint. Wrap Up Sometimes, finding the best thermostat for heat pump with auxiliary heat can be quite challenging – but as long as you know what to look for, the process should be quite easy. They left saying that they have no idea what is going on and don't remember what they did the first time. Verify that this system has an Auxiliary heating stage. Failure of the transformer that provides power to the thermostat can also prevent it from sending signals to the furnace. The auxiliary heat would kick in at this point to help maintain the temperature in the space. W: Auxiliary heat, stage 1. The problem occurs when the temperature drops below freezing at 32° F, as there isn’t enough heat in the air. If the heat pump turns on when you want cool air, but not for heat, this is likely the cause. Remove the thermostat’s display. A dirty furnace filter is one of the most common causes of furnace malfunction. I have a Trane single stage heat pump and an Ecobee 3. Rear heat not working - I have a 1999 150 Econoline van that is very frustrating ! Over time, the unit works less efficiently. When the temperature level detects that more heat is necessary to fill up a certain room or space, the auxiliary heating mechanism will be automatically activated. Typically the auxillary heat will be on and off perodically, you'll know when its on because you will feel warm air coming from the registers, the heat pump by itself w/ no auxillary heat will usually only send out 90F temperature from the registers, give or take 5F - … Emergency Heat, also known as “auxiliary heat”, is the second stage of heat that your thermostat runs on when the temperature is too cold for your heat pump to extract heat from the outside. Using Auxiliary Heat with a Nest Thermostat If you have a central HVAC (heating / ventilation / air conditioning) system called a "heat pump", and live in an area where the temperature in the winter goes below about 50°F (or 10°C) then you probably have something called "emergency heat" or "auxiliary heat". Once the pilot is lit, turn the gas valve back to the ON position. If no wire is present then you don’t have AUX heat which means that the “Heat Pump Balance” isn’t available. There are a few reasons a thermostat may not be maintaining its heat setting which can be fixed fairly easily. you possibly hooked it up wrong. For more information, see Jumper. They are BUSS 60 amp time delay current limiting class RK5 HAC-R-60 fuses. Scrub the sensor gently to remove dust and other residues. But it is definitely still heating your home. Then, if possible, remove the sensor from the furnace. For instance, on an air handler with 15kw heaters, one breaker powers the blower and one heater while another breaker powers the remaining two heaters. Than it might be possible that the load conditions are high. Auxillary Heat implies that you have an Air Source Heat Pump. If this is the case, properly shutting the door on your furnace may fix the problem. Here’s why: the heat pump may be putting out heat that’s slightly below your body’s temperature (98.6 degrees F, just FYI). Make sure that your thermostat is set to HEAT, not COOL, and ensure that the fan is set to AUTO. The differential from the thermostat set point is what determines when the auxiliary/ emergency heat energizes. Get daily tips and tricks for making your best home. Even though the components of your outside unit are designed to withstand the elements—hot or cold—it may still be possible for heavy ice to bend the aluminum fan and coil fins. Some York units have a feature which disables the electric heaters above a certain outside temperature (usually around 35-40 deg). Pros recommend keeping at least 80 percent of your heating registers open to prevent unnecessary pressure in your furnace and ducts. Another unlikely, but possible, cause of "no heat" on a heat pump system is a failure of the heat pump itself. A dirty flame sensor may cause your furnace to function improperly. How to Troubleshoot a Gas Furnace That Produces No Heat. Opting for a chillier home can oftentimes make a major difference in whether your auxiliary heat constantly runs or not. It usually looks like a big battery. All new York air handlers have a feature which disables the auxiliary heaters … You may be able to replace these components yourself, or you can call an HVAC professional for assistance. Emergency Heat, also known as “auxiliary heat”, is the second stage of heat that your thermostat runs on when the temperature is too cold for your heat pump to extract heat from the outside. A furnace that frequently shuts off automatically may have other issues, such as a clogged air filter or blocked ducts that are causing the furnace to overheat. Many modern furnaces have a computer control board with coded LED lights that flash to provide you with information on problems with your furnace. The most common cause of this failure is low airflow across the heaters. At that point, your heat pump might need a bit of auxiliary heat – and if you want things to run smoothly, you might want to install a thermostat with auxiliary heat as well. 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. 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). Emergency Heat is typically triggered when it is 35°F and below outside. It will also need to be replaced by a technician. Then, check to be sure that the thermostat is set to a temperature high enough to trigger the furnace to emit heat. If your aux heat indicator is on, it means your heat pump needs a little help reaching its target temperature setting. If the furnace powers up, you should soon have heated air cycling through your home once again. Pros recommend changing them once a month. This "lock-out" also energizes the fan to run continuous until manually reset. I do not have 24v on the output of the transformer nor 240 at the input. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional.