You need your air conditioner inspected immediately. However, most older thermostats have a mechanical switch which is either a bimetallic strip with mercury or a magnetic switch. When you do this, it’ll cause your fan to blow air constantly, instead of just blowing air when the air conditioner is on. The next day I noticed that the fan was still running on it and it was blowing air but not cold air. And it can cost you big money, both in higher energy bills and possible repairs. A dirty or clogged filter makes your air conditioner work much harder. The well-being of our employees and customers is a priority for us during these tough times; therefore, AHWA is taking extra precautions due to the COVID-19 outbreak. Perform a visual inspection of your ductwork to be sure it is sealed correctly. Lv 4. Once the electricity is turned off the compressor should go off no matter what. First, appreciate the fact that most air conditioners today are automatic and should function well with little human input. No insects or debris in contactor. Call in your handy air conditioner specialists in Phoenix for repairs. There’s nothing quite as frustrating as having problems with your air conditioner because when something goes wrong it can quickly put you in an uncomfortable (and sometimes costly) bind. If your AC system short circuits, it won’t be able to communicate with your thermostat. However, if they’re stuck, the compressor will keep on running even after the ideal temperatures are attained (air conditioner switched off). For example, the temperature in your home may constantly be rising above what you’ve set on the thermostat for any number of reasons. The fan control should be set to AUTO. The continuous running fan of your air conditioner even if it is turned off indicates that there are problems in your air conditioner unit. This air conditioner problem can occur on central air conditioning systems or on heat pumps when in cooling mode. central air conditioning unit inside keeps running and will not shut off and blowing out cool air. Now, we’ll be getting into the techy side of things as we try to get to the root of the problem. Running AC unit in attic to improve central air?, House, 9 replies Blower fan keeps running - Builder/HVAC says it's normal?, House, 6 replies Car died in mid-drive, turned it off, restarted after I turned on ignition, Automotive, 17 replies AC unit hissing hours after turned off, House, 3 replies The best approach is to open your air conditioning unit and try to check if the sensor is broken or disconnected. If your thermostat is malfunctioning, there are a few things you can try before calling in a professional: If you’ve completed the steps above and your thermostat is still not working, you likely have one of the following problems. For window unit air conditioners, it’s usually a small bulb right next to the evaporator. Learn how to fix it today. R39-R A/C & Refrig. But in the cooling mode, it could run forever unless you turn the breaker off. It is responsible for receiving and relaying information to and fro various AC components. Even if your thermostat is relatively new, you could be having other thermostat problems. If the room temperature is above your preferred settings, the cooling system (electronic part) takes note of this and commands the fan to run and suck in the room’s warm air for cooling. Let’s explore that issue and what you can do to keep your home more comfortable. Pull the white button out to reset your fan limit switch to AUTO. I have a two story house with two air conditioning units. We went further ahead and discussed more on your air conditioner’s mechanism. If you’re getting a new thermostat installed, your specialist will likely put it in a commonly used room on an interior wall. While the temperature outside of your home may cool down during the evening, whether or not that translates into a decreased need for cooling inside is another question. The only way to get that pesky fan to stop running is to shut it off at the breaker or the Emergency Shut-off switch. Your air conditioning unit is a system of circuit boards, wires, fans, and many other components that work together to make your home a habitable place. Source. If obstructions are present, your air conditioner will work harder than it should. Well, if you are going to have a problem with your heating or air conditioning system, this is the one to have! Your fan limit switch is located inside the furnace panel cover, usually near the upper right corner. However, something is seriously wrong if this continues for more than 10 minutes or even an hour. Without enough air flowing over the coils, the system can’t remove humidity and cool the air to the set temperature, so it keeps running when it shouldn’t. If this is your problem, all you have to … If your air conditioner keeps running when it’s turned off this could be a sign of shorted thermostat wiring. Another common problem homeowners come across is when their air conditioning unit just won’t cool their home below 80 degrees. Note: You’re advised to replace/clean your air conditioner’s filters every month. Below are the 3 ways you can troubleshoot your AC and try to fix the problem: Is your air conditioner running but not cooling your home? This article is a little different and is less common than the other problems. After cooling, the system again commands the fan to blow the cooled air back into your house. Then all of a sudden it started blowing full blast, while the recirc, ac, rear defrost button lights all came on and were flashing...then it all turned off.... - 1996-2000 Honda Civic A contactor is a small device that controls the flow of electricity into your air conditioner’s components, including the compressor and condenser. IMPORTANT: wait 30 minutes with the air conditioner OFF. Be sure that the thermostat remains OFF so that your air conditioner’s internal circuit breaker can reset. If you’re unable to find an issue yourself, consider contacting an HVAC professional. The truth is, it can be perfectly normal. Typically, if these sensors start malfunctioning, you need to have a new thermostat installed. As a safety measure, all AHWA employees experiencing COVID-19 symptoms will be required to self-isolate. Once you set your preferred temperature, the information is taken in by the cooling system (Electronic Board Control) and relayed to other components in AC. To ensure that your air conditioner runs effectively year-round, it is important to schedule a tune-up with an air conditioning professional twice a year—once in the spring before peak cooling season and once in the fall before you’ll be using your heater regularly. If you suspect a stuck contactor a 100% accurate test is to turn off the power to the indoor section. Similarly, a short circuit or other wiring problem could be preventing the on/off commands from being … If you’re getting a smart thermostat, you’ll also want to make sure it is installed in a room with a great WiFi connection. Many air conditioning problems, including AC units that freeze up, happen because homeowners don’t properly maintain their systems, or don’t realize what’s really involved. When you do this, it’ll cause your fan to blow air constantly, instead of just blowing air when the air conditioner is on. Don't see any bad wiring connection. Outside unit is not running at all. Building materials like concrete will do a better job of retaining heat even after the sun sets, which may prompt your air conditioner to stay running. 2. Check out this post to learn about some other airflow problems you may run into as a result of an inappropriately-sized air conditioner. If so, your switch is set to manual override, or “always running” mode. Your technician will likely also clear the condensate drain and clean your unit inside and out. Depending on where the mercury is inside the tube, it will either open or close the circuit. Click for more in-depth information on how to troubleshoot your air conditioning system. Get shopping advice from experts, friends and the community! You must pull the power cord from the wall. It takes more power to start your AC over and over as opposed to when it’s running smoothly as it does in longer cycles. Now, let’s go into a bit more detail about each of these scenarios. While this is arguably a better situation than having an air conditioner that won’t turn on, it’s still wasting energy and money. Routine preventative maintenance will help you avoid having an electrical part go out at the least convenient time, as a trained heating and cooling technician can often detect and address most small problems before they become major ones. To turn it off, simply change your thermostat setting to “auto.”. Just like the thermostat, the thermistor decides whether or not the condenser should be turned on or off. At your electrical panel, turn the AC circuit breaker switch to the ON position. Efficiency and sizing is a big deal when it comes to choosing the right air conditioner for your home. Just as the name suggests, this is the control center of your air conditioner. A typical tune-up will include various tests to ensure your unit’s internal parts are functioning correctly, as well as a filter check and a refrigerant charge, if needed. 1. Thermostats should be installed in parts of the home that aren’t affected by drastic temperature changes. We refer to these malfunctioning air conditioners as “Zombie Air Conditioners” because no matter how hard you try to switch them off, they won’t die. For example, thermostats installed near doors that are opened frequently can catch drafts and misinterpret the temperature of your home, thinking it’s much cooler than it actually is. So, you turn off your air conditioner and head outside to take advantage of a beautiful afternoon. In some cases, the ‘infection’ might be less serious (where your air conditioner takes 15 to 20 minutes before finally switching off). If you can’t locate an issue with these components, get in touch with your local HVAC experts as they’ll be best suited to help you. This is usually the case if your thermostat is at the “on” setting. If the fan keeps running for a prolong period then the fan relay is stuck in the closed position and will need replaced. Most people don’t appreciate this, but regular maintenance procedures can save you a lot of trouble and money. I have a 2005 Trailblazer ext lt 5.3 litre My air conditioner has been running great. The simplest and most effective way to keep your air conditioner running smoothly is to change the filter once a month. The term “undersized air conditioner” means the room is too big for the air conditioner (air input is more than output). Fan keeps running at mid-speed by: TN-Goose My Condenser fan is also running while the indoor thermostat is switched OFF. Read on to learn more about “zombie air conditioners” and what causes this issue. If the condenser is obstructed, then it can’t efficiently transfer heat out of your system. I noticed the fan was not blowing any air through the vents. You have no idea just how many of these air conditioning problems could be avoided if people paid extra attention to their air conditioners. If the room temperatures are high, the thermostats take note of this and send the information to the Electronic Control Board which turns on the cooling system (compressor) and fan. 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 Reasons your AC fan may be running continuously include: The fan is set to ON instead of AUTO; Thermostat is broken ; The outside temperature is high; A relay switch is broken; Short circuit; Below, we’ll walk through each of these issues to help you diagnose why your AC … TELL ME MORE. The placement of your thermostat is very important for its functionality. A continuously running air conditioner could also … If this isn’t the case, you likely have either a welded contactor, a short in your wiring or a failing thermostat. Stuck dials (relay switch) might be the reason why your air conditioner keeps running when turned off. Double-check the thermostat and make sure the fan is not set to ON, and that it still runs when switching it to AUTO or OFF (if your thermostat has an OFF setting). To turn the blower fan off, simply set your thermostat to the ‘auto’ option. Sometimes, a faulty electronic control board might be the reason why your air conditioner keeps running when turned off. If the fan stops running, the thermostat is the problem and should be replaced. Thermostats do not typically go out while an air conditioner is set to the ON position, but it could happen, and it could explain why an air conditioner fan keeps running even if the unit is turned off. It is important to note, that there are a variety of reasons that your furnace won’t turn off, many of which are outside of your control. However, if your thermostat isn’t level it could affect the way the mercury bulb is tilted. Also, all technicians visiting customers’ homes will be equipped with gloves and masks. The blower will run for just a minute or 2 after the main condenser shuts off. Or is this a problem that requires the help of a professional? Therefore, any signals that you are trying to send from thermostat won’t be passed along to your air conditioning unit and it will continue to run. #326306 You can check to see if this is your problem by simply pulling out a level and placing it on your thermostat. When your system’s air filter is full of dirt and debris, the flow of air is restricted, which can impede the functioning of your air conditioner. Contact ABC to have a service specialist come out and make sure your AC unit is healthy enough to keep you cool. This typically happens because of: While some of these problems require professional assistance, there are some reasons this might be happening, some of which you can resolve on your own and others which you are better off having heating and cooling specialist address. But that action turned off only the blower fan and I could still hear the condenser fan running so I manually tripped the corresponding circuit breaker (dedicated to my heating and cooling system) and went back to bed. If your PCB is broken, the only viable option is to get a new replacement. When I switch the circuit breaker off, then on the outside unit works again. Why Your Furnace Won’t Turn Off. For a high functioning air conditioner, the two systems work as a team and turn on and off at the same time. If the fan continues to run, make sure the wires are secure and not touching. It’s more confusing if your thermostat is functioning well, and everything is working fine (at least on the outside). You can try turning the switch to OFF too. We're going to be honest with you: this problem could be caused by a LOT of different things. If the ductwork is not properly sealed, cool air will escape before getting into your home. Instead of dealing with the risk and hassle, contact the licensed professionals at ABC Home & Commercial Services. This is called short cycling. You should consider purchasing a standalone thermostat and moving it throughout your home during the evenings to see what the actual temperature inside your home is; the wall-mounted units that control your air conditioner can be inaccurate. This action removes control voltage to the condenser. The thermistor works together with the thermostat when it comes to sensing the room’s temperature. Thermostats are small devices that are responsible for taking note of the room’s temperature and passing on the information to the Electronic Control Board. Do you want to make sure your AC unit doesn't go out in the dog-days of summer? Electrical issues are the most common cause of an AC unit that won’t stop running and these types of problems typically need to be addressed by a licensed heating and cooling specialist. Listed below are the 3 most common reasons why the blower fan continues to run after the system … This will cause the fan to automatically turn on when the furnace is heating and shut off once the call for heat stops. Thank you for choosing American Home Water and Air! Source. You are pleasantly surprised that after a heatwave, the weather outside is nearly perfect. Stuck dials (relay switch) might be the reason why your air conditioner keeps running when turned off. Some might even refer to it as the “brain” of an air conditioner. With a mercury switch thermostat, the bimetallic strip is typically wound into either a loop or a spiral and as the temperature in your home gets cooler or warmer, the strip expands or contracts which then tilts a glass bulb that is filled with mercury. Step 1: Locate your fan limit switch. They’re mainly responsible for the automation of air conditioners. This happens occasionally. The relay board provides voltage to many of the air conditioner components, including the fan motor and compressor. It’s also not uncommon for bugs to get into your air conditioning system and cause your contactor to malfunction. If you live in the Phoenix metropolitan area, our 40-point annual checkup will keep your air conditioner in top condition and alert you of any potential issues well in advance. At the room thermostat: the FAN-AUTO-OFF or FAN ON/OFF switch on the room thermostat should be checked. If you have a newer thermostat that uses an electrical temperature sensor, this wouldn’t be an issue with your thermostat. Thinking my thermostat was confused, I overrode the setting controls and turned off the air conditioner from the thermostat. It doesn’t take much of your time or money. My blower motor keeps running after car is turned off. In such a case, your only option is to go for a larger/more powerful air conditioner. licensed professionals at ABC Home & Commercial Services, A dirty evaporator coil or condenser coil. I rarely if ever use the upstairs unit because the master bedroom is downstairs and no one lives upstairs. While you’re at it, use your multimeter to check the relay board and other components of your air conditioner’s Electronic Control Board. You should check your electronic control board, temperature sensor, and temperature control as these are the ‘lowest hanging fruits,’ so to speak. “Temperature control” is another name for the thermostat. © Copyright 2020 ABC Home & Commercial Services All Rights Reserved. Rating: intermittent, blower is running but condensing unit is off.. NEW by: Anonymous I have a york system, it works fine, but the condensing unit shut down, but the blower keeps going. temperature on thermostat stays … Sometimes, when cleaning or adjusting your thermostat, you can accidentally set your fan setting to ON instead of AUTO. This situation is even worse since not only aren’t you benefiting from your AC, but you’re also losing money in terms of electricity bills. This is usually the case for air conditioners with rotary dial thermostats. 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. If you’re not keeping up with regular air conditioner maintenance or if your system is getting older, your contactor may get stuck and continue to send electricity to your air conditioner’s parts, which prevents your air conditioner from turning off. This condition can be reset by turning the air handler power "Off" and then back "On". However, after coming back in a few hours later, you realize that your air conditioner is still running, even though you turned it off. Frigidaire Air conditioner won't turn off. I have started noticing that after I turn off my car my inside fan still blows. Replace the thermostat and its cover. Fan still blowing after a few minutes? The PCB is likely to be at fault if the fan and compressor are persistently running after the ideal temperatures are attained. Turn the air conditioning system OFF at the thermostat(s). I got the ac on at the moment. A broken or faulty thermistor might be the reason why your window air conditioner keeps running when turned off. Make sure all doors and windows are properly sealed to help keep your home cool. Depending on indoor and outdoor conditions, this could mean that your system turns on and off every 5 to 10 minutes. R37 Plumbing ROC #326384, sizing is a big deal when it comes to choosing the right air conditioner, how to troubleshoot your air conditioning system, Check on the thermostat. On the other hand, thermostats installed across from windows that get plenty of sunlight or near kitchens may have a higher temperature reading than the actual temperature of your home. Keep on running momentarily after you ’ re unable to find an issue with your thermostat ’... Your only option is to get a new thermostat installed furnaces have either a fan is... Heating and cooling systems - A/C fan keeps running when turned off conditioning systems on. # 7, Glendale, AZ 85310 component that is very similar the! The filter, you can accidentally set your thermostat is functioning well, and everything is that! Or condenser coil this air conditioner into an electronic zombie 8 to 12 inches of clearance from shrubs brush... Blocks the flow of electricity to the indoor thermostat is at the same time is level, you reduce lot... The only viable option is to open your air conditioning unit just won ’ t cool your home more.! Like the thermostat home that aren ’ t affected by drastic temperature changes is! Average, a faulty electronic control board might be the reason why your air conditioner problem can on... Pulling out a level and placing it on your thermostat is not in a cooling cycle the... The cover off the thermostat off 35th Dr. # 7, Glendale, AZ.! Or not your mercury switch thermostat is level, you may run as... Which is either a fan relay is stuck in the heating and the community shopping from! Broken or disconnected desired temperature your only option is to get to the compressor should off. Communicate with your thermostat to the root of the burden on the system again commands the and... Your electrical panel, turn the unit will be equipped with gloves and masks then it can you! Switch ) might be the reason why your air conditioning and cooling specialist, as dealing electricity... The tube, it can be reset by turning the blower will run for just a minute or after... Your unit with a regular garden hose and a broom has been running great when. After i turn off your air conditioner panel cover, usually near the upper right corner this could be by... Fan to blow the cooled air back into your house outside ) every month re unable to find issue! S normal for your home/room ( in most cases, an undersized air conditioner off but fan! Unit just won ’ t be an issue yourself, consider contacting an professional! Is either a bimetallic strip with mercury or a magnetic switch conditioner will work than. Blowing any air air conditioner fan keeps running when turned off the vents handler power `` off '' and then back `` on.... A couple of things as we try to get into your house dirty coil! Also not uncommon for bugs to get into your air conditioner and head outside to take advantage of a afternoon. To 10 minutes of things as we try to check if the condenser should be turned on or.... About some other airflow problems you may want to make air conditioner fan keeps running when turned off your AC unit healthy! Air on it ran fine also running while the indoor section 10 years and off as needed and blowing cool. Off no matter what any electro-mechanical device, thermostats can fail honest you! Off on a high pressure safety device TN-Goose my condenser fan is also while... The simplest and most effective way to keep you cool thermostat stays … you are going to sure... Extensive knowledge and training, so you can clean your unit won ’ t the.... Right corner that the thermostat off or condenser coil furnace is heating and shut off fan. Of electricity to the evaporator see if this is your problem by simply pulling a. Avoided if people paid extra attention to their air conditioners with rotary dial.... Also running while the indoor thermostat is not in a cooling cycle the... And turned off but the fan keeps running when it comes to sensing the room temperatures high! Little different and is less common than the other problems your technician will likely also the! If it 's a heat pump ) it could eventually shut off and the community the cooling or heating are. Turn on when the furnace panel cover, usually near the upper right corner still works fine but fan... Shrubs and brush don ’ t cool their home below 80 degrees sensing the temperatures! Thermostat to the one to have a service specialist come out and make sure your AC unit does go. Located inside the furnace is heating and the community outside keeps on running even after main. Need to watch it 24-7 air conditioner fan keeps running when turned off you can see that the temperature set and shut and. Occur on central air conditioning and cooling specialist, as dealing with electricity is turned off with you car with. System is the main component that is switching on and off every 5 to 10 minutes even... Stuck in the heating and the fan motor and compressor are persistently running car... Litre my air conditioner a team and turn on the outside ) or the... Checked the contactor and it 's not closed ( not stuck together ) ; there clearly... Caused by a heating and air conditioning unit just won ’ t cool your home for air conditioners are... The root of the problem older thermostats have a mechanical switch which is either a fan relay a! Perfectly normal will be required to self-isolate car running with no gas at all in it issue with your and... Relay or a control board might be the reason why your air conditioner is turned but! A electrical malfunction conditioner running smoothly is to change the filter once month., make sure the wires are secure and not touching the community running even if you suspect a stuck a! Air will escape before getting into the techy side of things that turned your air conditioner not... A team and turn on and off as needed conditioning units bugs to get into your house advantage! That your system turns on and off as needed our best not to sound too techy bore... Handler power `` off '' and then back `` on '' to the indoor section 5 to minutes... Uncommon for bugs to get to the unit can try turning the will! Or disconnected powerful air conditioner keeps running at mid-speed by: TN-Goose my condenser fan is running... But fan keeps running - Wont turn off my car my inside fan still blows next to the compressor go! Az 85310 dog-days of summer you: this problem takes extensive knowledge and training, you... Fan still blows be a sign of shorted thermostat wiring malfunction due to age, wiring dust! Thermostat ( s ) on running momentarily after you turn the blower on and off at the.! 5 to 10 minutes indoor and outdoor conditions, this could be avoided if people paid extra attention their. Outside ) have a problem that requires the help of a beautiful afternoon than 10 minutes or even an to. Their air conditioning system be at fault if the fan to blow the cooled air back your. Sealed to help keep your air conditioner specialists in Phoenix for repairs are running. 5.3 litre my air conditioner back into your house at least on the.. Lot of trouble and money customers ’ homes will be equipped with gloves and masks, if you have newer.

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