Honeywell thermostat heat won't turn off

Honeywell Thermostat Won't Turn on Heat? How to Fix. For the most part, problems with a Honeywell thermostat heating system may require an HVAC professional to fix. But it could be a minor issue sometimes and you could fix it by doing the following: Go to your vents and check the airflow. Examine the furnace system. Check the thermostat wiring.

Step 3: Scroll down to "Smart Response Technology" and select it. Step 4: Select "Off" to turn off the recovery mode. Step 5: Press the "Done" button to save your changes. Once you have completed these steps, your Honeywell thermostat will no longer be in recovery mode. If you encounter any issues or the recovery mode persists, it ...To Sum Up. Now you know why your thermostat says heat on, but no heat is really coming out of the vents. Make sure to: Check the settings. Clean the device. Change the filter and batteries. Make sure that the thermostat undergoes regular maintenance.l 8 flashes - Power off failure. Honeywell Water Heater Parts at Low Costs! Honeywell Water Heater Pilot Light Won't Light. Pilot light in a water heater is a small flame that continually operates. When you turn on your hot water tap, the hot water flows out to the fixture.Make sure that the power is running to your units or that the gas valves are open. Turn the thermostat up as high as it will go to try to kickstart your furnace. You also need to ensure that the thermostat is set to the heat position. Testing the thermostat for the summer months will look a little different. Set the temperature lower than usual ...1/31/22. Your thermostat is designed to control temperature to +/- 1 F. How often your heat turns on and off depends on several factors including the type of heating system you have and load conditions (in other words, how hot or cold it is outside). A typical mid-efficiency forced air system will cycle about five times in an hour (5CPH) under ...They can’t tell the heat pump to turn off. A quick replacement should set things right. 4. Heat Pump Blower Fan. Sometimes people think that the heat pump is running but it is only the blower fan that is moving. Check whether the thermostat fan setting is “ON”. This will keep the fan running no matter what.Compressor Protection. Honeywell thermostats can read “Cool On” or “Heat On” without working to protect the compressor. This built-in function can trigger when you turn the heat back on too soon after the system turns off. Otherwise, your compressor can overload, and it may break from too much pressure and overuse.

A blinking flame symbol on a Honeywell Thermostat implies your thermostat has been set to heat mode and there is a call for heat. This is known as the time off delay and is there to prevent your Heat pump compressor from short cycling. Time off delay will typically not take more than 5 minutes. If 5 minutes elapses and the flame symbol ...3. Electrical Issues. The furnace can also run nonstop and effectively refuse to shut off with the thermostat due to underlying electrical issues. For instance, an internal relay (the furnace has several) can become stuck in a closed position, thus keeping the furnace running until you shut off power at the breaker.If your Honeywell thermostat says wait, rest assured that the unit should start itself in due time. If you find that your thermostat continues to offer this message after ten minutes or longer, you may need to seek professional help. Call in your local HVAC experts to examine your thermostat and your HVAC system to determine where the issue lies.Why won't your boiler turn off? Here we detail some common causes and potential solutions. We use essential cookies to make our site work. With your consent, we may also use non-essential cookies to improve user experience, personalize content, customize advertisements, and analyze website traffic. For these reasons, we may share your site ...Turn the HVAC circuit breaker off. If the thermostat has a separate circuit breaker or switch, turn that off as well. Open the battery housing. (For some Honeywell thermostats you'll have to remove the faceplate to get to the batteries, while others have a battery housing on the outside.) Remove the batteries. Re-insert the batteries but ...Turn ON the thermostat. Press the PROGRAM button thrice. The reset button is located inside a small hole on the front panel of the thermostat and to the right of the buttons. Use a sharp object (toothpick, paperclip, or pin), put it in the hole, and press the button for about 5 seconds. Now, your thermostat has been reset.Set your thermostat to the lowest temperature reading while making sure the mode is set to Cool. Also, make sure that the fan setting is set to Auto, especially if your Honeywell Thermostat says cool on but no air seems to come out. Doing this will let you check if your thermostat can reliably control the cooling within your home.

Oct 25, 2023 · Resetting your Honeywell Pro Series thermostat is a simple process that can be completed in just a few steps. First, locate the reset button on the side of the device. This will usually be located towards the bottom right-hand side of the thermostat panel. Next, press and hold down this reset button for at least three seconds before releasing it. Aug 30, 2018 ... The Most Common Reason Why A Gas Furnace Won't Turn On ... Honeywell 6000 Thermostat - Service Champions Heating ... Replace Batteries On A ...Albion Posts: 10 Forumite. 2 October 2012 at 10:42PM in In my home (includes DIY) MoneySaving. I have a bit of a problem with my central heating as it will not turn off even with it turned all the way down on the thermostat and off at the programmer. I think it may be the 3 way valve as the lever was loose and hanging down and I have managed to ...RECONNECTING A THERMOSTAT TO A WIFI NETWORK. If your device was previously connected, please remove the face plate from the wall plate for 30 seconds and then reconnect it. After. 2 minutes, check the following: WiFi Icon is present. Look for it in the top right or top left corners of the thermostat display. If the icon is present and does not ...Mar 21, 2011 · 8 posts · Joined 2011. #1 · Mar 21, 2011. I just installed a Honeywell RTH2300 in my home to replace an old mercury unit. It appears to be somewhat working, but the AC/Heat will not shut off. For example, it is set at 75 and the ac keeps running down indefinitely. Also, when the thermostat is switched to the 'off' position, the heating/ac ... at HEAT WON'T TURN OFF. First, confirm that the room thermostat is not calling for heating or cooling. ... Some models of Fan Limit Controls such as the Honeywell L4046B229& Universal Fan and Limit Controler, in particular the Honeywell L4064B,W, and R models have a manual fan switch that overrides the fan control to keep the fan running ...

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The first thing to do is check the connections to your thermostat. That is because your unit is not shutting off properly. After all, the device cannot read the temperature well. Therefore, you should focus on the wiring and sensor of the device. The wiring and sensor could become rusty or faulty for its age.Honeywell has made a business out of helping homes be more comfortable. Today, it is one of the leaders in providing solutions for connected homes, including delivering a variety o...1/31/22. Your thermostat is designed to control temperature to +/- 1 F. How often your heat turns on and off depends on several factors including the type of heating system you have and load conditions (in other words, how hot or cold it is outside). A typical mid-efficiency forced air system will cycle about five times in an hour (5CPH) under ...Replace the thermostat batteries to see if anything changes. We recommended getting in touch with a specialist to diagnose the problem if these solutions don’t work. 2. Check to See if the Programmer is Faulty. The next possible culprit to suspect if your boiler won’t turn off is the programmer.Call for heat and allow the unit to come on. Let it run for a few minutes (for the good of the equipment) and then pop the thermostat off the sub-base and see if the unit shuts down. This is kind of a down and dirty means of checking to see if the thermostat is to blame or if something else is happening. Done. Popped thermostat from base.

Step 1: Turn off the power to your furnace/ air handler. A furnace switch will typically look like a light switch and be located on the side of the furnace. If you can't find the switch turn of the HVAC system at the main circuit breaker. Step 2: Remove your thermostat from the wall. This is usually done by pulling the thermostat from the ...1. Verify that the thermostat is set to heat and is calling for heat, usually indicated by the words "heat on", a flame icon, or a shimmering sun icon. If the room temperature is below the heat set point, the thermostat display should indicate a call for heat. 2. Confirm that the boiler power switch and circuit breakers are on.Basically, you set the heat on a Honeywell, Nest, Ecobee thermostat, etc., as you should, but the furnace does not respond; ie. furnace will not turn on with the thermostat. This classic 'thermostat won't turn on heat' issue indicates either a thermostat-to-furnace communication problem (wrong thermostat wiring) or a faulty furnace.Here's a summary of the common causes and fixes for a Honeywell space heater that has stopped working or won't turn on along with some troubleshooting tips: Power Supply Issues: Check the heater's connection to the power source, test other outlets, and inspect circuit breakers for tripping. Power Cord Condition: Avoid using extension ...Before touching any wires or connections, be sure to turn off the breaker that powers your thermostat. All Honeywell thermostats use the "G" terminal to control the fan. If no wire is connected to the G terminal (or the wire is not secure), the fan will not activate. If the G wire is fine but the fan won't turn on, your HVAC system needs servicing.Step1- Connect the thermostat to your home Wi-Fi (Setup on thermostat display) Once installed and configured, the thermostat will prompt you to connect to Wi-Fi. Select your Home Wi-Fi network name …AC or furnace won't turn on; A heater or air conditioner that fails to turn on indicates a faulty thermostat. Primarily, this problem results from broken or loose wires between the thermostat and the HVAC unit. AC or heater won't turn off; Unsurprisingly, a faulty thermostat may cause the AC or the heater to work non-stop without turning off.Compressor Protection. Honeywell thermostats can read “Cool On” or “Heat On” without working to protect the compressor. This built-in function can trigger when you turn the heat back on too soon after the system turns off. Otherwise, your compressor can overload, and it may break from too much pressure and overuse.It looks like the T874 D 1165 is a two-stage heating & cooling thermostat that supports heat pump systems. ... Honeywell Thermostat Fan Won't Turn Off. Honeywell Thermostat Reset: Simple Tricks for Quick Troubleshooting in 2024. Honeywell Thermostat Instruction Manuals (All Models)If the thermostat has a cover, flip it open (some modern, smart thermostats won't have a cover). Gently clean away dirt particles using a soft bristle brush or compressed air and a dry microfiber cloth. Never use a wet cloth around the delicate electrical parts. Replace the cover and turn the power back on. 4.0 Comments. Honeywell Space Heater keeps turning or shutting off due to: Safety features get activated. You may use an extension cord to plug your heater. Dirty contacts or loose connection. Dust may have accumulated inside the unit. Defective thermostat. Fan may work improperly or it gets gummed up.

2. Dirty or Malfunctioning Thermostat: A dirty or malfunctioning thermostat can cause erratic behavior. To check if this is the issue, follow these steps: – Turn off the power to your HVAC system. – Remove the thermostat cover. – Carefully clean the interior with a soft brush to remove dust and debris.

If your blank thermostat runs on batteries, try replacing them – and see if that turns the thermostat back on. An Open Furnace Door. If you own a Honeywell thermostat, the blank screen could be an indication of a furnace door that wasn’t completely closed. These thermostats are programmed to shut off entirely if a furnace …Solution. Check the fan limit switch. Turn off power to the furnace or air handler. Locate the fan limit switch, which is usually located on the furnace or air handler’s blower compartment. Check if the fan limit switch is stuck, dirty, or defective. Clean or replace the switch if it’s dirty or defective. If the switch is stuck, gently push ...Here's an easy four step process to resetting your thermostat after a power outage. 1. Turn off your thermostat. Before doing any other troubleshooting, start by finding your thermostat and turning it off. You don't want your thermostat to be on and signaling the system when completing the later steps in our process that involve electricity.Should you turn your heat down when you're not home or leave it be? Which will save the most energy and money? The answer might surprise you. Advertisement What's worse than freezi...Check the relays. Another possible cause for a baseboard heater that won’t turn off is a faulty relay. Relays are responsible for controlling the flow of electricity to the heater. If a relay gets stuck in the “on” position, the heater will continue to run even when it should be off. Check the relays for any signs of damage or malfunction.If they're dead, replace them. Batteries generally need to be replaced, on average every 6 to 8 months. If your thermostat is not powered by batteries, you'll want to check if your HVAC equipment, including the transformer, is working properly. Check if the fuse is bad.Step 4. Check the wiring. If some of the wirings have become loose, the bad connections might cause the thermostat screen to turn blank. If you've, just installed your thermostat and the screen doesn't respond, chances are great that the wires are not connected properly or connected to the wrong terminals.The first thing to do is check the connections to your thermostat. That is because your unit is not shutting off properly. After all, the device cannot read the temperature well. Therefore, you should focus on the wiring and sensor of the device. The wiring and sensor could become rusty or faulty for its age.

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Honeywell Thermostat Won't Turn On Heat. If you feel like the heat isn't turning on timely and that the thermostat isn't reaching the temperature level, you could check for the following: HVAC access door/furnace door is open; Tripped circuit breaker; Fan not working; Make sure HVAC access doors, as well as the furnace door, are shut.See full list on inspectapedia.com You program the device to shut down the heating system when the temperature reaches 64 degrees Fahrenheit, but during a cold streak, you increase the temperature to a more comfortable 68 only to …Having trouble with your Honeywell thermostat? Browse Honeywell Home’s library of thermostat troubleshooting resources and guides.Details of checking the thermostat's FAN-AUTO-OFF or FAN-ON switch position when the furnace (or air conditioning) fan won't stop running are. at FAN WONT STOP - THERMOSTAT SWITCH. Other snafus such as a shorted thermostat wire can also cause the A/C or warm air furnace fan to run continuously.1. Verify that the thermostat is set to heat and is calling for heat, usually indicated by the words "heat on", a flame icon, or a shimmering sun icon. If the room temperature is below the heat set point, the thermostat display should indicate a call for heat. 2. Ensure that the furnace door is closed. 3.Feb 22, 2022 · First check that the thermostat is set to the Heat position. Make sure the temperature is set higher than the Inside temperature reading. Also check the circuit breaker and reset if necessary. Make sure that the furnace door is closed securely. If “wait” is in the screen or “heat on” is flashing – wait 5 minutes for the system to ... Some thermostats have specific protocols in place to reset a thermostat after the power goes out. 2. Inspect Circuit Breaker. Examine your circuit breaker if you find your thermostat not working after a power outage. Look for blown fuses that could cause your thermostat to stop working.A few possible reasons include: There might be a problem with the temperature sensor of your Honeywell thermostat. This means that your Honeywell thermostat is thinking it is hot in your house when it is actually not. Therefore, the fan keeps running even though it should shut off. There could also be extreme temperatures in your house.Table of Contents. Honeywell thermostat buttons not working - what to do. Fix 1: Clean the buttons. Step 1: Yank the thermostat off the wall. Step 2: Remove the battery compartment. Step 3: Separate the front (from the back) Step 4: Inspect the front part. Step 5: Clean the dirt off. Step 6: Re-assemble the unit.If your Honeywell Pro Series Thermostat's fan won't turn off, check the fan settings and inspect for any wiring issues. Resetting the thermostat may also resolve the problem. Experiencing issues with your Honeywell Pro Series Thermostat can be frustrating, especially when the fan refuses to shut off.How to turn on & off Auxiliary heat on a honeywell thermostat. It's worth noting that no heat pumps will have auxiliary heat capability. So only those that were installed with 2 stage heating sources will have this option. If your system doesn't have it, you won't see the option on the screen. ….

Heat wont shut off, Honeywell CT87N1001 Round Heat/Cool Manual Thermostat, i put it on air turned it off aqnd on, - Answered by a verified HVAC TechnicianCT30/CT33 Low-voltage Thermostat 5. Set adjustment lever (CT30 only) 1 Separate cover from thermostat, and remove the plastic insert. 2 Use a pencil to move the adjust- ment lever to the proper setting for your system (see table below). Finish installation. 1 Align the 3 tabs on the cover with slots on the thermostat, then push gently until the ...If your Honeywell thermostat won't go above 70, it is likely due to the temperature limit setting. You can adjust this setting using the up and down arrows on your thermostat. To do this, press "Settings" and then select "System.". From there you will need to scroll down until you see "Heat/Cool Limit Set.". Once selected, use the ...Look along the top of the thermostat and locate the button which reads 'press'. Press down on the button. This will release the battery pack area, which will rotate outward, and then should slide completely up and out. Remove the old batteries and dispose of them properly. Replace with new batteries.If you have a wire in the R terminal and a wire in the Rc terminal, the jumper selector switch must be in the "2 Wire" position. Check your wiring. If you have a heat pump, you will not use a wire in the W terminal. Move the W wire to the W2 or Aux terminal. (W controls your first stage of heating for Gas/Oil/Electric systems.The Honeywell RTH5160 thermostat can be reset with a few simple steps. First, turn the power off to your thermostat and wait at least one minute before turning it back on. Once powered up, press and hold down …First, head over to your electrical breaker box and turn off the power source to your thermostat. Next, turn the thermostat off and carefully remove the top cover of the unit. Look at the wiring and check if anything is loose, broken, or disconnected. Also, check to see if everything is clean. If the inside of your thermostat is filthy or there ...Should you turn your heat down when you're not home or leave it be? Which will save the most energy and money? The answer might surprise you. Advertisement What's worse than freezi...8 Reasons for a Sensi thermostat not turning on A/C. Possible cause. Fix. Wrong thermostat settings. Set thermostat to cool and temp point below current room temperature. Wrong thermostat wiring. Ensure wires for the compressor relays are connected. Power issues. Check breakers and reset them where necessary. Honeywell thermostat heat won't turn off, 12,038 satisfied customers. Just moved into a new house with a honeywell thermostat. The. Just moved into a new house with a honeywell thermostat. The temp is set at 76. If I try to lower the temp it jumps back to 76. I can't seem to make read more. airheatman. HVAC Technician., Installed new thermostat - Heat won't shut off. I tried to install a new Honeywell Wifi Thermostat over the weekend. Of course, my current system didn't have the C-wire. So I ran new 18-5 cable, connected everything VERY carefully (no shorts, carefully trimmed wires, etc.), and turned on the system. I first checked the house fan (on/off)., If your valve cap had a screw, store the cap and screw together. 3. Turn the valve clockwise with a pair of pliers. Grip the top of the metal valve with a sturdy pair of pliers and turn it clockwise. Keep turning the valve until it doesn't go any further. When it's all the way to the right, the radiator is off., Here's how to do it. 1. Keep the House Temperature Low. When you buy a new Honeywell thermostat, there's a certain temp that you'll need to set as the house temp. If you bring this temp to 68-70 degrees, the aux heat won't turn on. That's one of the parts of your thermostat's programming., Apr 25, 2020 ... Just gonna put this out here it might help someone. Figured out none of this is the problem of my furnace but the nest thermostat I ..., Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. On 2021-04-07 by (mod) my thermostat will not turn on the heat or the ac . @sunnie, Your heating or A.C service tech will probably start by removing the thermostat from consideration by disconnecting it at the furnace or AC unit and jumping the thermostat terminals there. If the equipment turns on as it should, then the problem is either the ..., Compressor Protection. Honeywell thermostats can read “Cool On” or “Heat On” without working to protect the compressor. This built-in function can trigger when you turn the heat back on too soon after the system turns off. Otherwise, your compressor can overload, and it may break from too much pressure and overuse., Jun 4, 2021 · Experts have identified four reasons why your heater may refuse to go off even when you turn off the thermostat; 1. Incorrect thermostat settings. In most cases, you’ll find that your heater isn’t going off because the thermostat is set incorrectly. Maybe you think you’ve switched it off, but it’s indeed on. , 4. Check the Furnace: If your thermostat appears to be functioning correctly but the heat is still not turning on, the problem might be with your heating system. Check if your furnace or heat source is receiving power. A blown fuse or a tripped circuit breaker could be the culprit. 5. Inspect the Air Filter:, 2/22/22. The thermostat has a feature called Adaptive Intelligent Recovery (AIR) or Smart Response or Early Start. This allows the thermostat to "learn" how long the heating and cooling system will take to reach the programmed temperature settings. So the temperature is reached at the time you set. For example: Set the Wake time to 6am, and the ..., Remove the Cover. The first step is to remove the cover of your thermostat device. This is helpful in having a precise look at thermostat unit for any kind of problem with the thermostat device. As soon as you open the thermostat device cover clear or clean all the dust or corrosion inside the thermostat device., Resetting your Honeywell Pro Series thermostat is a simple process that can be completed in just a few steps. First, locate the reset button on the side of the device. This will usually be located towards the bottom right-hand side of the thermostat panel. Next, press and hold down this reset button for at least three seconds before releasing it., Call for heat and allow the unit to come on. Let it run for a few minutes (for the good of the equipment) and then pop the thermostat off the sub-base and see if the unit shuts down. This is kind of a down and dirty means of checking to see if the thermostat is to blame or if something else is happening. Done. Popped thermostat from base., Detach the battery compartment and remove the old batteries. Insert the new batteries. Remount the compartment to the mounting plate and press the faceplate back on. Switch on the thermostat at the circuit breaker. If the batteries were the culprit, then the heating system should function properly shortly afterwards., Inspect the wiring on the base. If there are any loose wires or wires that are cut or corroded, they should be clipped, stripped and reattached to the terminal screws. Replace the thermostat body plate. Restore power at the circuit breaker panel box. TIP: If it appears you still have the same thermostat problems, check out our guide how to ..., Sep 30, 2023 · Reason 1: Incorrect Temperature Setting. When your thermostat displays “Heat On” but doesn’t produce warmth, it’s often because the temperature setting isn’t above the room’s current temperature. This causes the heating system to remain idle, despite the thermostat’s indication. The thermostat’s primary function is to maintain ... , I just had my heat pump replaced with a new 13-SEER 2 Ton York. The good news is, my A/C is working and blowing lots of cool air. The bad news, the unit doesn't shut off when it reaches the temperature on the thermostat. For example, I set it to 72 (it was only 73 inside before I turned it on). Within 10-15 minutes, the thermostat read 72, but ..., 2/22/22. The thermostat has a feature called Adaptive Intelligent Recovery (AIR) or Smart Response or Early Start. This allows the thermostat to "learn" how long the heating and cooling system will take to reach the programmed temperature settings. So the temperature is reached at the time you set. For example: Set the Wake time to 6am, and the ..., If you need to reset your Honeywell Home Pro Series thermostat, the process is quite simple. First, locate the control panel on the front of your thermostat and press down firmly for at least 3 seconds until all buttons appear on the display screen. Once they do, look for a button labeled "Reset" or "System Reset" and press it once to ..., Fix 4: Update Firmware And Restart. To troubleshoot the Honeywell T5 thermostat, start by checking for firmware updates. Install the latest version if available. Next, turn off the power to the thermostat and then turn it back on to perform a restart. Give the thermostat some time to reset and reestablish its connection., Not all thermostats have this feature, so check your manual to see if yours does. If not, your problem could be something else. Solution: If you have a battery tester, take out your batteries and test them. Replace if necessary. If not, replace them anyway and see if that stops your thermostat from blinking. 3., Reset the Honeywell thermostat. If you’re having trouble resetting your Honeywell thermostat fan, you can try a few things. First, make sure you’ve removed the battery from the device. If you can’t find the battery, you may have to take it to your local Honeywell dealer. Next, remove the thermostat cover. You’ll find the cover on the ..., How to fix it. To resolve this issue, check your thermostat’s temperature setting and make sure it’s set above the current room temperature. Adjust the …, To do this, find the various schedules on the display on your thermostat. Press the set button to get past the time and day. When you get to a scheduled time you want to cancel, press the hold button for about 5 seconds. Once the numbers on your screen changes to zero, press “Set” to lock in the changes., Reason 1: Incorrect Temperature Setting. When your thermostat displays “Heat On” but doesn’t produce warmth, it’s often because the temperature setting isn’t above the room’s current temperature. This causes the heating system to remain idle, despite the thermostat’s indication. The thermostat’s primary function is to maintain ..., Turn off power, recconnect the fan switch, turn on power and again set thermostat to call for heat. Fan should come on when plenum temperature has reached fan-on setting. [1], If your blank thermostat runs on batteries, try replacing them – and see if that turns the thermostat back on. An Open Furnace Door. If you own a Honeywell thermostat, the blank screen could be an indication of a furnace door that wasn’t completely closed. These thermostats are programmed to shut off entirely if a furnace …, Feb 25, 2023 ... ... Thermostat. Sep-up, programming, operation and lots more. https://youtu.be/wGPKZuo6AFM VIDEO: Easiest way to turn your heating on and off, ..., Call for heat and allow the unit to come on. Let it run for a few minutes (for the good of the equipment) and then pop the thermostat off the sub-base and see if the unit shuts down. This is kind of a down and dirty means of checking to see if the thermostat is to blame or if something else is happening. Done. Popped thermostat from base., Bottom line the thermostat controls the off and on of your heat system thermostat is nothing but a switch that shuts your furnace on or off when the desired heat level is reached, you can actually run a heat system manually with a simple toggle switch and get the same results as a thermostat, so to simplify your problem first make sure your power supply to the furnace is correct if so then ..., 2/22/22. The thermostat has a feature called Adaptive Intelligent Recovery (AIR) or Smart Response or Early Start. This allows the thermostat to "learn" how long the heating and cooling system will take to reach the programmed temperature settings. So the temperature is reached at the time you set. For example: Set the Wake time to 6am, and the ..., Why won't your boiler turn off? Here we detail some common causes and potential solutions. We use essential cookies to make our site work. With your consent, we may also use non-essential cookies to improve user experience, personalize content, customize advertisements, and analyze website traffic. For these reasons, we may share your site ..., Set the temperature between 60 and 80 degrees to keep the house at a regular temperature and avoid auxiliary heat. Evenly distribute the temperature in your house and improve your insulation to prevent an auxiliary heat backup. Seeing that auxiliary heat light turn on can be a little alarming. But, it’s really nothing to worry about.