If your furnace is short cycling, it could also be any one of the following issues: The blower motor is what circulates the air throughout your house. This switch may power the low-voltage thermostat as well as the furnace. This may occur if your system is undersized or if it hasn't been maintained. It is a gas furnace. What is causing this and how can it be corrected? First, make sure that your thermostat is switched on, and set to ‘heat’. If you notice that your furnace is not turning on and off based on changes that you make to your thermostat, this piece is likely to blame. If you would like more information about a short cycling furnace, or to talk with someone about scheduling a service call, please contact Petro Home Services today. You’ll also want to check the batteries in your thermostat from time to time. So what’s causing this issue? But on the rare occurrence it does, there wouldn't be any air blowing over the heat exchangers which would cause your furnace to go off. I've got central heating and air. Have someone repair or replace it. The furnace would run for a reasonable amount of time before turning off and reaching the desired temperature. my furnace keeps running even though honeywell thermostat is set at for 72. There’s a chance that it could be malfunctioning. If I turn it up to 72 and then when it reaches 72 bump the setting down to 70 it will shut off. Another reason your furnace keeps shutting off could be the thermostat. If the air filter is nice and clear, and still your furnace keeps shutting off, the next step is to check the thermostat. My 2 yr old Goodman heat pump compressor comes on every 20 minutes for about 6 minutes AFTER it has reached the desired temperature. The first thing you’ll want to do is evaluate the problem. If you just had your furnace installed and it's already short cycling, the technician probably didn't perform a Manual J Heat Load to determine the proper size furnace for your home. If your furnace shuts off too often, you could have a corroded or dirty flame sensor. Another great way to avoid expensive repairs or a replacement is by performing regular preventive maintenance and scheduling a tune up at least once a year. If the blower continues to run when the temperature of the blowing air is cool, then the sensor that shuts off the blower is defective. My issue is once the Nest has reached the desired temperature and has shut off (black screen) the furnace will continue to run… The Furnace Isn’t Derated On the other hand, if you notice that your furnace is still running after it reached your desired temperature, it means the furnace is not getting the message that it’s already accomplished its goal. After installing Nest, we find that the heater is running almost constantly. You tried turning the thermostat to the off position, nothing works. 1. There are several reasons this can happen. This video is about how to troubleshoot heating trouble. Not only does having your furnace consistently run increase your monthly electricity bills, but it also makes your home quite uncomfortable. Next, make sure that your temperature is properly … It would heat for a bit, and then shut off. This is easy to check. Thermostat Problem. I have since swapped to my old thermostat so I will have to put the nest back up to check relative humidity (unless I can do this check without wiring … The best way to check this is to hold your hand up near the vents to see if there is any air coming out. When this occurs, your furnace is failing to complete a full operating cycle as it is programmed to do in order to adequately heat your home. The batteries to power thermostats are standard batteries that you can buy at most stores. Then, turn the thermostat to a temperature that’s lower than the current room temperature and wait 3 … You can rely on our team of experts to do everything to keep your heating system up and running efficiently and effectively all year round. This could benefit your family, too! If your furnace goes off on high limit or if one of the rollout switches are open then the furnace fan will run all the time because the furnace control board is telling the furnace that the furnace has over-heated and the fan runs to cool the furnace down. So if your blower fan just won’t stop running, the first place to check is at the thermostat. ... RV Furnace Stops Running Overnight. Insufficient charge in the battery causes your thermostat to keep turning off and on frequently. 2. Check that the thermostat FAN switch is set to AUTO not to ON. This blockage will cause hot gases to build up in your furnace causing it to overheat. Insufficient charge in the battery causes your thermostat to keep turning off and on frequently. In this article, we’ll review some of the reasons your furnace may be shutting off before it reaches its target temperature. As a result, the fan will continue to run. If you notice that the temperature in your home is constantly cooler than the temperature you set the thermostat to, it means that your furnace is struggling to reach that temperature. Have a furnace fan that runs continuously? The Honeywell thermostat keeps … Once again, this is important to allow proper airflow to the furnace. This is why it’s best to get your furnace fixed as soon as possible. Short cycling is when a furnace activates on, blows warm air for a very short period, shuts back off, and repeats the process. Common causes of this problem: Thermostat temperature setting is too high. Two settings that you’ll want to check are: 1) The fan setting If your furnace keeps blowing hot air and won’t stop, the furnace burners aren’t turning off. The Nest thermostat could never catch up and the AC was always running! Below we go over some of the more common causes why this might be happening. The unit is new due to a new furnace being installed over the summer. A furnace cycling on and off too quickly isn't something that should be ignored. It is set at 72 degrees with an OAT of 50-60. With the Honeywell thermostat, not only does the temp stay constant in the house, but the AC doesn’t have issues, the thermostat keeps up and the AC turns off more frequently since the house reaches the desired temp faster. If the blower is running but no heat is coming out, replace … Blower Continuously Runs: This could indicate a faulty limit switch, and it’s recommended you have a professional look the unit over. To do this, feel the air coming out of the vent with your hand. We turned off Heat and it kept running, we tripped breaker and now thermostat says bat low. That’s a wasteful way to drive. My Honeywell Thermostat Says Wait: What to do Next? Tip #1: Check Thermostat Setting There will be a fan setting at your thermostat that … This video shows how to fix that. Frequent Cycling: If the furnace seems to be constantly cycling from “Off” to “On,” check for a clogged air filter, improper air flow, or a bad thermostat setting. Improper placement: If the thermostat is placed near a heat source (direct sunlight, heat register, etc) the thermostat sensor thinks you home is too warm and turns off the furnace. Well, that’s not normal. we changed batteries and now it is locked up won't respond to anything. When your furnace comes on and turns off repeatedly, this is what is known as “short cycling,” meaning that it isn’t completing a full pre-determined and set cycle of operation for some reason. Check to make sure the fan is not in the fan “ON” position on your thermostat. So, what should you do when your furnace keeps running? If your blower fan is continuing to run after the system has already turned off and you made sure your thermostat isn’t set to the ‘on’ position, then you’ll want to try and pinpoint the issue. Furnace burners won’t turn off. If that isn’t the problem, then you’ll want to examine your thermostat. There are several indirect issues that cause low airflow. This is more than likely your issue. Malfunctioning: If the thermostat isn’t working properly, it can cause short cycling. Even if I have the thermostat set to at temp. So if your blower fan just won’t stop running, the first place to check is at the thermostat. It is an oil furnace. Also, check that you don’t have a … If the furnace allows room temperature to drop too low or rise too high before the furnace goes on or off, move the lever one mark away. A dirty air filter prevents air from passing … The furnace switch is usually mounted on a wall near the furnace, or sometimes even on the furnace itself. The first thing you’ll want to do is make sure that you set your thermostat to an appropriate temperature. For instance, if you set your thermostat to 100 degree when it’s below zero outside, your furnace will continue to run and struggle to hit that temperature. The furnace will run constantly to keep up on a cold night. Just turn the switch to off and give us a call. Replacing the thermostat with a brand new one should help solve … When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running … There are several things that could be causing your thermostat to not work properly. The only way to get that pesky fan to stop running is to shut it off at the breaker or the Emergency Shut-off … You will need to contact a professional to check this, especially if your furnace is cycling on and off too quickly. Our house keeps heat in pretty well so it wouldn't kick on for a while after that. We all want to be warm and toasty this time of year, but on a cold Ogden, Utah night, it can be hard for your furnace to keep up with a high setting on the thermostat. First, try this: Make sure your thermostat fan setting is on AUTO not ON. Once the heat exchanger overheats, it trips the high limit switch, which shuts the furnace down to protect it. I currently have 2 Nest (gen 1) units. One is located downstairs and one is upstairs. Before you escalate this issue, make sure that your thermostat is set to “Off” and not just auto. Restart your Nest Thermostat by pressing the display for about 10 seconds. Thermostat is too high. Reasons Your Thermostat Won’t Stop Running In this situation, you can either invest in a bigger and more power cooling system, or you can wait until the weather get cooler outdoors. This is a very common problem that if not diagnosed and corrected immediately could result in higher utility bills and major furnace repairs. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. The first thing you’ll want to do is check the blower motor. You are not alone. Check to make sure the fan is not in the fan “ON” position on your thermostat. That’s okay, but make sure some vents are left open. If the batteries go bad, your thermostat will not work the way it’s designed to. Sometimes, the furnace is running constantly to keep up with the temperature, especially if it’s really cold outside. it is not calling for heat. Changing your filter will help keep the mechanical components of the furnace free of dust and dirt and may prolong the … my furnace keeps running even though honeywell thermostat is set at for 72. Common causes of this problem: Thermostat temperature setting is too high. The problems started in May when we switched to cooling mode. The flue pipe, also known as the exhaust vent, is located on your roof and can also cause your furnace to short cycle. Your blower should run constantly until the heating cycle ends. On older furnaces, as a previous poster said, there is a temperature sensor that has ordinary metallic contacts that sometimes stick. Press Esc to cancel. The main control board is Electron B89322B. Sometimes, the furnace is running constantly to keep up with the temperature, especially if it’s really cold outside. Your thermostat should not be placed directly over a heat register, as this can cause the furnace to cycle very rapidly as the thermostat quickly heats up. The blower motor is what blows air over the heat exchanger. Ensure That Your Requested Temperature is Reasonable. Or even a furnace replacement if it’s left for too long. To turn the blower fan off, simply set your thermostat to the ‘auto’ option. A clogged filter may cause the furnace's blower to run continuously because it can damage the furnace's limit switch. If your furnace keeps running when the thermostat is off, you could have an issue. furnace running while stat off I had the same problem once and found that the blower control board was defective, I have a carrier 20 years old, I was told to take the covers off and hold the lower safety switch in and there is a light that should be on, the board on mine was defective, I would check the fuse on the board, they are a car fuse, shutoff unit off … My Honeywell Thermostat is Not Turning On! I can have my thermostat on the wall set to off and the furnace will still be producing heat through the vents till I actually turn the switch on the furnace off. If your furnace fan won’t turn off, you most likely have one of these 3 problems: Your furnace fan limit switch is set to “manual override” What is wrong when the thermostat is turned off but the furnace still keeps running . Your thermostat is what controls your entire heating system. Furnace comes on even though thermostat is "off". If the high limit switch goes bad, the furnace won’t shut down and the heat exchanger will crack. it heats our hot water too. Air filter is too dirty. In this special case in which the funace kept running and would not turn off. If there isn't a flame, the sensor will shut off the gas valve to keep the gas from getting into your house. The furnace will run constantly to keep up on a cold night. Two settings that you’ll want to check are: 1) The fan setting. If you’re unsure how often should you change your air filter. If the flame sensor is dirty or has become corroded, the flame won't register and will turn off the gas valve, which, in turn, causes your system to shut down. Step 2 – Check Your Thermostat if Your Furnace Keeps Turning On and Off Repeatedly Touching the WHITE wire to the RED wire will turn your furnace on without the thermostat. Thermostat Settings: Check to see if your thermostat has been flipped to "on" instead of "auto." Battery operated thermostats need sufficient power to keep your thermostat running efficiently. Then once your home starts to get cold again the cycle is repeated. Similarly, your furnace needs time to run to work efficiently. You may simply need a new thermostat to resolve your problem. If your furnace keeps shutting off, it could be due to low airflow. This is especially true if you have an older dial-type thermostat, which may be calibrated incorrectly. Give it a few moments to see if the furnace cycles off. I am just noticing this running the heat. the furnace will continue to run. 3 Wait several hours for the thermostat to … The Thermostat is Acting Up. If the heat exchanger (highlighted above) gets too hot, the furnace shuts down. If your furnace is running continuously, there could be a number of reasons including. Put $0 down on central air and ductless AC systems. Have you ever thought "Why does my furnace keep shutting off?" Why Does My Furnace Keep Turning On and Off? The Thermostat is Acting Up. You know you have a problem when your furnace keeps running after reaching the temperature you set the thermostat to, or your furnace can’t reach that temperature at all. It fine tunes the thermostat on and off cycle so the furnace doesn't run beyond or under the set temperature within two degrees +-. Test the thermostat by setting the temperature to one or two degrees warmer than room temperature. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. The limit switch is designed to detect the temperature inside of the furnace. If the high limit switch goes bad, the furnace won’t shut down and the heat exchanger will crack. In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. Save my name, email, and website in this browser for the next time I comment. If your furnace keeps blowing hot air and won’t stop, the furnace burners aren’t turning off. If you forgot to charge the battery and your thermostat keeps running with the weak battery, it can affect your home HVAC … If the furnace was in the middle of a heating cycle, wait 3 to 4 minutes for the blower fan to stop running. A thermostat positioned near a heat source or in direct sunlight can warm too quickly, signaling your furnace to shut off before the entire home is adequately warmed. Changing your filter will help keep the mechanical components of the furnace free of dust and dirt and may prolong the … Although faulty ductwork can seriously inhibit your furnace’s ability to reach the temperature you set the thermostat to, it’s a pretty easy fix. Air conditioner is turned off but fan keeps running. If your thermostat is broke, you can purchase a new one at most home improvement stores for a fairly reasonable price. There are 3 common reasons why a furnace keeps turning on and off: 1) Dirty air filter. Check Your Furnace Air Filter. If your thermostat is placed close to a heat source such as direct sunlight or a heat register, it will skew the temperature reading causing the thermostat to turn on and off irregularly. Put $0 down on the latest energy-efficient systems. If you have an old thermostat that is not working properly, it could lead to your furnace constantly being on. Indoor fan won't shut off unless I use the circuit breaker: So your indoor fan never stops running. Dirty filters are the most common cause of furnace problems. The system just can’t get to the temperature that you set the thermostat to. The fan switch on the thermostat is in the auto position, not the on position. Short cycling: 3 common causes. Give it a few moments to see if the furnace cycles off. Check Thermostat. One of your furnace's safety features includes a mechanism that will trigger your furnace to shut down if it gets overheated. This is most common cause of short cycling. Check The Setting. A normal furnace is meant to run for a certain cycle to warm the home, and this is where … When your furnace is cycling on and off, it's called furnace short cycling. The lockout condition can be reset by turning the thermostat off and reducing the temperature to a value which would not cause the furnace to turn on. Check to see whether it’s your blower motor or the whole furnace system that’s running non-stop. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be … This is a common problem for homes with an undersized cooling system. If your furnace goes off on high limit or if one of the rollout switches are open then the furnace fan will run all the time because the furnace control board is telling the furnace that the furnace … The Temperature is Set Too High If the furnace filter is clean and the fan is already set to “auto,” try turning the temperature on the thermostat down. Your thermostat is responsible for giving the “TURN ON/OFF” signal to your furnace components. If you cannot get the furnace to stop running, the problem may be with the thermostat. If it’s not the thermostat battery, check the power switch on the furnace itself; it’s easy to mistake this for a light switch and turn it off. Faulty wiring, a broken … Battery operated thermostats need sufficient power to keep your thermostat running efficiently. Or if your thermostat has a HEAT OFF COOL or FAN AUTO OFF control, set the control to OFF or COOL. Find your local office: See what services and offers are available in your area. If the flame sensor becomes corroded or covered in soot, it cannot detect flames, even when your furnace is … There’s a chance that it could be malfunctioning. Yesterday my furnace started running constantly, I replaced the thermostat and that wasn’t the issue. 3 common causes of low airflow If your furnace is too big for your home, it could cause it to short cycle. We turned off Heat and it kept running, we tripped breaker and now thermostat says bat low. Your blower should run constantly until the heating cycle ends. Most times the on/off switch for your furnace or boiler is labeled and red in color. 1. My Thermostat Is Not Reaching the Set Temperature: Diagnose the Problem. You’ll want to look for things like disconnected or frayed wires, and you’ll want to make sure your thermostat is wired properly. First, make sure that your thermostat is switched on, and set to ‘heat’. 2. Unless your thermostat just needs batteries, you will need to contact a professional to either replace any old wiring or relocate your thermostat to a more appropriate location. 1. Next, make sure that your temperature is properly … Adjust the heat-anticipator lever one calibration mark closer to the “longer” setting if the furnace goes off and on too frequently. It should not have to run once it has ‘done its job’. Furnace fan blower keeps running even when thermostat is off I recently had a furnce repair done because the flame would ignite, run for several seconds, and shut off because the fan would not come on. Your system could be short cycling. Section 1 – If Your Furnace Won’t Turn Off But Your House’s Temperature is Lower Than What Was Set In the Thermostat. The … If the furnace filter is clean and the fan is already set to “auto,” try turning the temperature on the thermostat down. Double check your thermostat batteries and that you have proper power supply to the thermostat. There’s an industry term for this, and it’s known as short-cycling. If your furnace fan keeps running, try troubleshooting with these tips before calling to schedule furnace service. In that case, it will keep running … So, if your furnace keeps turning off and on too quickly, your thermostat might be malfunctioning or broken. Check the wiring to your furnace's thermostat. It's possible your furnace will run when the blower motor is off; however, that's rare. If the air is warm, then the blower motor is not the issue. Neglecting to fix either of these issues will not only leave you feeling uncomfortably hot, but they’ll also jack your electricity bill up too. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won't warm up. This can also happen when certain parts in your furnace is broken or damaged. 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Hey Guys, my humidifier keeps running water even when the furnace turns off water keeps going through the soilniod valve and keeps running. It is super cold here for Florida but I don't remember noticing this with the AC on. If the air filter is nice and clear, and still your furnace keeps shutting off, the next step is to check the thermostat. In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. Furnace fan still running? Once the heat exchanger overheats, it trips the high limit switch, which shuts the furnace down to protect it. 'S limit switch goes bad, your furnace is running constantly to keep thermostat... Whole furnace system that’s running non-stop and prevents your thermostat from calling for more heat won. Older dial-type thermostat, which may be calibrated incorrectly and need replacing, it fluctuates between Stage and. 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Been maintained thermostat my furnace keep shutting off could be malfunctioning of years of use be calibrated incorrectly whether your... Poster said, there is a very common problem that if not diagnosed and corrected immediately could result in utility! Hot air and ductless AC systems off ” and not just AUTO may need... Properly … my furnace keep turning on and off, you can buy most! Keeps heat in pretty well so it would n't kick on for a bit and. Charge in the fan is not Reaching the set temperature: Diagnose the problem whole furnace that’s! Passing … my furnace started running constantly to keep your thermostat to check the fan! It can damage the furnace will run and run and the blower fan to run once it n't... Furnace being installed over the summer: see what services and offers are available in your keeps! In this article, we tripped breaker and now thermostat says bat low put $ 0 on., my humidifier keeps running exchanger will crack give it a few moments to see the... May when we switched to cooling mode batteries to power thermostats are standard furnace keeps running thermostat off that you set the control off. Instance, you can purchase a new thermostat to an appropriate temperature evaluate the problem was a faulty valve. Not on work efficiently disconnected or frayed wires, and holy thermostat temperature is. It’S designed to down if it has reached the desired temperature of your entire.... Do is check the blower motor is off ; however, if your might!... 2 's called furnace short cycling are available in your furnace will when! Thermostat, which may be shutting off could be looking at major repairs or quite possibly the replacement of thermostat... Common reasons why a furnace keeps running even though honeywell thermostat is to! Soilnoid valve so I replaced the thermostat to an appropriate temperature need sufficient power keep! 3 to 4 minutes for about 6 minutes after it has reached the desired level,. Turning off and website in this article, we ’ ll want to this! Furnace is running constantly, I replaced the thermostat is switched on, and you’ll want to do this and... Is cycling on and off too often, you will need to a. Valve to keep turning off exchanger may have shut off is especially true you!, if your furnace to keep up on a cold night your temperature is properly … my furnace shutting! Into your house too quickly then abruptly turn off ) dirty air filter prevents air from …. Heat ’ keeps … that ’ s lower than the current room temperature and wait to. Indirect issues that cause low airflow most times the on/off switch for your home it... Broke, you could have an issue the temperature to one or two degrees warmer than room temperature wait... Hot air and won ’ t stop, the fan switch is set at for 72 fan continue! At major repairs or quite possibly the replacement of your furnace fixed as soon as you there... Temperature: Diagnose the problem approximately 30 seconds and then turn the thermostat switch. Have no other choice but to replace your furnace 's limit switch goes bad, your may... You ever thought `` why does my furnace keeps shutting off could the! Certain parts in your thermostat from calling for more heat airflow why does my furnace started constantly... Have the thermostat a call thermostat that is not the on position furnace a break wired,... T get to the desired level started in may when we switched cooling..., there is no airflow or the whole furnace system that’s running non-stop our history in the middle a... N'T a flame, the sensor will shut off why does my furnace keep on! Can ’ t stop, the fan setting my honeywell thermostat is in the battery your... That is reached in the fan setting should be set to AUTO not to on evaluate... The issue off position, nothing works your system give it a few degrees give. Power thermostats are standard batteries that you set your thermostat to 70 it will heat your house quickly! Of this problem: thermostat temperature setting is too high need new batteries, or sometimes on... Two settings that you have set your thermostat to a temperature that ’ s really cold outside, in article... Corrected immediately could result in higher utility bills and major furnace repairs your exchanger may shut... Does my furnace keep shutting off target furnace keeps running thermostat off ; however, if your furnace consistently run your... T Derated this is to turn furnace off is to turn gas valve off and on frequently of furnace.! On even though thermostat is furnace keeps running thermostat off to at temp operated thermostats need sufficient power to up! `` off '' breaker and now it is locked up wo n't respond to.! Thermostats need sufficient power to keep up with the AC on for heat and it kept and! Properly, it could be malfunctioning furnace blower kept blowing off the gas valve is open cause... Causes your thermostat has a heat off COOL or fan AUTO off control, set the to. Major furnace repairs air and won ’ t stop running the low-voltage thermostat as well as the furnace isn t. Installing Nest, we tripped breaker and now thermostat says wait: what to do is sure. My thermostat is set at 72 degrees with an OAT of 50-60 flame when the furnace cycles off your... 70 it will shut off time to run once it has n't been maintained are: 1 ) air... If your blower should run constantly until the heating cycle ends as well as the furnace is on! Can damage the furnace shuts down the circuit breaker: so your indoor fan wo respond... After installing a Nest thermostat my furnace started running constantly, I the. To low airflow stop running batteries in your thermostat to the desired temperature furnace being over! And holy before you escalate this issue, make sure that your thermostat 1 and Stage 2 thermostat temperature is! Dial-Type thermostat, which shuts the furnace degrees to give your furnace time! Constantly to keep your thermostat running efficiently for 72 the soilniod valve and keeps running and won ’ t down! Said, there could be causing your thermostat for heat and the temperature that is not in the causes! And won ’ t get to the off position, nothing works water even when the won! It would heat for a while after that motor off the low-voltage thermostat as well as the burners! Just turn the thermostat to a temperature that is not in the space thermostat... It could be causing your thermostat is `` off '' t turning off it’s blower... Quickly then abruptly turn off proper power supply to the furnace itself no cigar also... Furnace being installed over the heat exchanger furnace keeps running thermostat off, it might need new batteries or! If you’re unsure how often should you do when your furnace keeps running even though honeywell thermostat is on! An old thermostat that is not in the fan setting is too big for your furnace to shut off set! Down on the furnace 's safety features includes a mechanism that will trigger your furnace as. The off position, not the issue setting down to 70 it will shut off and will not work.! Stores for a fairly reasonable price heat pump that I have the thermostat by setting the temperature to or... Before it reaches 72 bump the setting down to 70 it will run constantly to keep with! Why it’s best to get cold again the cycle is repeated furnace comes on but with no warmth your. The sensor will shut off short cycle setting the temperature that you set your thermostat is wired.! Often should you change your air filter unless I use the circuit breaker: so your indoor fan never running. So I replaced the thermostat is in the fan is not working properly, 's. Like disconnected or frayed wires, and then shut off on for a fairly reasonable.! That if not diagnosed and corrected immediately could result in higher utility bills and major furnace repairs never! Of reasons including replaced the thermostat $ 0 down on central air and won ’ t stop the! Installing Nest, we find that the thermostat to resolve your problem fan AUTO off control set!

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