If the condenser is obstructed, then it can’t efficiently transfer heat out of your system. Call in your handy air conditioner specialists in Phoenix for repairs. 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. Changing the filters can help lower your unit’s energy consumption between 5 to 15 percent and extend the life of your air conditioning unit. Replace the thermostat and its cover. Check out this post to learn about some other airflow problems you may run into as a result of an inappropriately-sized air conditioner. It’s also not uncommon for bugs to get into your air conditioning system and cause your contactor to malfunction. There are a couple of reasons your air conditioner keeps running when turned off. A electrical malfunction. This article is a little different and is less common than the other problems. My Kenmore room air conditioner model number 580. R39-R A/C & Refrig. However, before you start shopping for a new thermostat, you can try recalibrating your thermostat, which you can do yourself or ask a professional to do for you. You can check to see if this is your problem by simply pulling out a level and placing it on your thermostat. Sometimes, when cleaning or adjusting your thermostat, you can accidentally set your fan setting to ON instead of AUTO. However, if they’re stuck, the compressor will keep on running even after the ideal temperatures are attained (air conditioner switched off). A continuously running air conditioner could also … Or is this a problem that requires the help of a professional? Source. Some might even refer to it as the “brain” of an air conditioner. If this isn’t the case, you likely have either a welded contactor, a short in your wiring or a failing thermostat. 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. Show More. They’re mainly responsible for the automation of air conditioners. These types of thermostats haven’t been available for purchase for some time, so you’ll likely need to have it replaced sooner rather than later. Make sure it’s on and in good working condition, Clean your air conditioner (especially the air filters), Inspect the Electronic Control Board for any signs of short-circuiting (black traces and burnt smell). After cooling, the system again commands the fan to blow the cooled air back into your house. This happens occasionally. 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? The unit will never kick off and continue to pour out the coldest air and freeze up the unit. Therefore, your air conditioner is unable to cool the room temperatures at a sustainable rate- This means your air conditioner will keep on running when turned off as it vainly strives to lower the room temperatures. In addition, trying to resolve these problems on your own can put you at risk of a more serious issue and can even be dangerous, since some repairs require working with your electrical system. An air conditioner that is switching on and off repeatedly is bad for both homeowners and your AC system. See the steps for checking these items above. Diagnosing and repairing this problem takes extensive knowledge and training, so you’ll need to contact a licensed professional. When your unit enters the cooling cycle, the contactor will once again let the electricity flow until the thermostat is satisfied with the temperature of the home. You chose the wrong air conditioner for your home/room (In most cases, an undersized air conditioner). When an air conditioner is not in a cooling cycle, the contactor blocks the flow of electricity to the unit. The fan control should be set to AUTO. Checked the contactor and it's not closed (not stuck together); there's clearly a gap so circuit is open. Perform a visual inspection of your ductwork to be sure it is sealed correctly. If the fan keeps running for a prolong period then the fan relay is stuck in the closed position and will need replaced. 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. Your technician will likely also clear the condensate drain and clean your unit inside and out. Thank you for choosing American Home Water and Air! 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. It’s more confusing if your thermostat is functioning well, and everything is working fine (at least on the outside). 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. A dirty or clogged filter makes your air conditioner work much harder. Typically, if these sensors start malfunctioning, you need to have a new thermostat installed. Air conditioner is turned off but fan keeps running. For window unit air conditioners, it’s usually a small bulb right next to the evaporator. If you’re getting a new thermostat installed, your specialist will likely put it in a commonly used room on an interior wall. This action removes control voltage to the condenser. Check out American Home Water and Air’s brand new showroom at 23439 North 35th Dr. #7, Glendale, AZ 85310. Note: It’s normal for your air conditioner to keep on running momentarily after you turn it off. You need to consider how well your home traps heat. The truth is, it can be perfectly normal. Turn the air conditioning system OFF at the thermostat(s). 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. Or you need to watch it 24-7 so you can either pull the plug or disconnect the power. Don't see any bad wiring connection. 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. central air conditioning unit inside keeps running and will not shut off and blowing out cool air. Similarly, a short circuit or other wiring problem could be preventing the on/off commands from being … This article will help by first explaining how air conditioners work, what might be causing this problem, the tools you’ll need, and how you’ll fix it. The next day I noticed that the fan was still running on it and it was blowing air but not cold air. You should check your electronic control board, temperature sensor, and temperature control as these are the ‘lowest hanging fruits,’ so to speak. The part of your air conditioning system which is outside should have 8 to 12 inches of clearance from shrubs and brush. If you have a newer thermostat that uses an electrical temperature sensor, this wouldn’t be an issue with your thermostat. This air conditioner problem can occur on central air conditioning systems or on heat pumps when in cooling mode. When you do this, it’ll cause your fan to blow air constantly, instead of just blowing air when the air conditioner is on. These are the three components you need check: If everything seems fine but you’re still experiencing this problem, then your air conditioner is in grave danger. I have a 2000 Honda civic ex. If your AC system short circuits, it won’t be able to communicate with your thermostat. Because it could start a bad fire. 2 1. overby. However, something is seriously wrong if this continues for more than 10 minutes or even an hour. Click for more in-depth information on how to troubleshoot your air conditioning system. The placement of your thermostat is very important for its functionality. If your thermostat can’t correctly determine the temperature in your home, your air conditioning unit will not work as it should. Read on to learn more about “zombie air conditioners” and what causes this issue. 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. An a ir conditioner unit with this problem may cycle between the ac not turning on and switching off over and over again, or it may simply stay on for hours on end. 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. Simply put, the dials usually meet to complete the circuit and turn on the compressor if the room temperatures are high. sometime, when I restart the system, it only works for 5 minutes then the condensing unit shut down but the blower fan keeps running. Simply put, the dials usually meet to complete the circuit and turn on the compressor if the room temperatures are high. Our specialists go through extensive training and are available 24/7, so you can rely on us to get the job done right and quickly make your home feel comfortable again. Source. If the fan stops running, the thermostat is the problem and should be replaced. The cooling system is the main component that is responsible for temperature regulation. I have started noticing that after I turn off my car my inside fan still blows. Another common problem homeowners come across is when their air conditioning unit just won’t cool their home below 80 degrees. I rarely if ever use the upstairs unit because the master bedroom is downstairs and no one lives upstairs. Learn how to fix it today. If the fan continues to run, make sure the wires are secure and not touching. If the air conditioner is working that coil would be warmer and a few of that warmth will pass on your radiator. The thermostat reaches the desired temperature, the indoor unit shuts off, the air stops blowing, but the outdoor unit keeps on running. The term “undersized air conditioner” means the room is too big for the air conditioner (air input is more than output). It is the same with you car running with no gas at all in it. Even if your thermostat is relatively new, you could be having other thermostat problems. 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. Now, we’ll be getting into the techy side of things as we try to get to the root of the problem. 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. You can see that the temperature inside is colder than … However, if your thermostat isn’t level it could affect the way the mercury bulb is tilted. To turn it off, simply change your thermostat setting to “auto.”. It is responsible for receiving and relaying information to and fro various AC components. 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. temperature on thermostat stays … Instead of dealing with the risk and hassle, contact the licensed professionals at ABC Home & Commercial Services. Step 1: Locate your fan limit switch. Whether or not your mercury switch thermostat is level, you may want to consider having it replaced. Efficiency and sizing is a big deal when it comes to choosing the right air conditioner for your home. If your air conditioner keeps running when it’s turned off this could be a sign of shorted thermostat wiring. If there is a problem with the relay board, it might provide continuous voltage to the compressor. It stops only if I remove the fuse. 2. You need your air conditioner inspected immediately. This is usually the case if your thermostat is at the “on” setting. You are pleasantly surprised that after a heatwave, the weather outside is nearly perfect. 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 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. © Copyright 2020 ABC Home & Commercial Services All Rights Reserved. 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. If obstructions are present, your air conditioner will work harder than it should. 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. Another frustrating air conditioner problem is when your unit won’t cool your home to your desired temperature. 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. Sometimes the relay or control can stick which will cause the fan … This kind of issue will also need to be addressed by a heating and cooling specialist, as dealing with electricity is dangerous. Sometimes, a faulty electronic control board might be the reason why your air conditioner keeps running when turned off. Most people don’t appreciate this, but regular maintenance procedures can save you a lot of trouble and money. We hope this won’t impact our service and we will remain open for business until further notice. Do you want to make sure your AC unit doesn't go out in the dog-days of summer? For example, the temperature in your home may constantly be rising above what you’ve set on the thermostat for any number of reasons. TELL ME MORE. In the heating mode (if it's a heat pump) it could eventually shut off on a high pressure safety device. If your PCB is broken, the only viable option is to get a new replacement. 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. Broken Relay Switch or Short Circuit: If only the fan is running, there may be a broken relay switch preventing the settings you enter on the thermostat from being sent to the fan. 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. Just contact us and we can get your furnace fan running normally in no time. 75251 never stops running even if you turn the unit off. We mentioned earlier that there are a couple of things that turned your air conditioner into an electronic zombie. However, after coming back in a few hours later, you realize that your air conditioner is still running, even though you turned it off. If the condenser fan keeps running then the contacts on your contactor are either welded together or have an insect or something else not letting the plunger function as designed. This is called short cycling. 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. We went further ahead and discussed more on your air conditioner’s mechanism. In some cases, the ‘infection’ might be less serious (where your air conditioner takes 15 to 20 minutes before finally switching off). If this is your problem, all you have to … I have a two story house with two air conditioning units. However, in some cases, the fan will keep on running even after the cooling system has turned off. IMPORTANT: wait 30 minutes with the air conditioner OFF. Once the electricity is turned off the compressor should go off no matter what. 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. I have a 2005 Trailblazer ext lt 5.3 litre My air conditioner has been running great. In the HVAC industry, when an air conditioner keeps running when turned off, techs call them “zombie air conditioners.” You can try to switch it off manually. 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. The simplest and most effective way to keep your air conditioner running smoothly is to change the filter once a month. You must pull the power cord from the wall. All furnaces have either a fan relay or a control board to cycle the fan on and off as needed. Aside from having an air conditioner that simply won’t turn off, other signs that indicate your thermostat is malfunctioning include a thermostat display that is unresponsive or unlit, a unit that won’t turn on and a discrepancy between your room temperature and the temperature on the thermostat. “Temperature control” is another name for the thermostat. Faulty Thermostat: If both the fan and either the cooling or heating system are running unexpectedly, you may have a faulty thermostat. While you’re at it, use your multimeter to check the relay board and other components of your air conditioner’s Electronic Control Board. The thermistor works together with the thermostat when it comes to sensing the room’s temperature. This is usually the case for air conditioners with rotary dial thermostats. 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. So, you turn off your air conditioner and head outside to take advantage of a beautiful afternoon. Your fan limit switch is located inside the furnace panel cover, usually near the upper right corner. Contact ABC to have a service specialist come out and make sure your AC unit is healthy enough to keep you cool. It will cool to the temperature set and shut off but the fan If you’re unable to find an issue yourself, consider contacting an HVAC professional. To turn the blower fan off, simply set your thermostat to the ‘auto’ option. The fan will keep on running to ensure perfect air circulation in your room. Now, this is another scenario that is very similar to the one we’ve talked about in the article. Let’s explore that issue and what you can do to keep your home more comfortable. After a decade, they may start to malfunction due to age, wiring or dust accumulation. This condition can be reset by turning the air handler power "Off" and then back "On". Make sure all doors and windows are properly sealed to help keep your home cool. One for the upstairs and one for the downstairs. I got the ac on at the moment. Pull the cover off the thermostat, then remove the mounting screws holding the thermostat to the sub-plate, and pull the thermostat off. We're going to be honest with you: this problem could be caused by a LOT of different things. 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. 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. Is your air conditioner running for 2 minutes, turning off for another 2, then turning on again? Thermostats should be installed in parts of the home that aren’t affected by drastic temperature changes. The blower will run for just a minute or 2 after the main condenser shuts off. 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. 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). Get shopping advice from experts, friends and the community! At your electrical panel, turn the AC circuit breaker switch to the ON position. If this is your problem, all you have to do it switch your fan from ON back to AUTO. Now, let’s go into a bit more detail about each of these scenarios. If so, your switch is set to manual override, or “always running” mode. On average, a thermometer lasts about 10 years. 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. Pull the white button out to reset your fan limit switch to AUTO. 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. In such a case, your only option is to go for a larger/more powerful air conditioner. Just as the name suggests, this is the control center of your air conditioner. You can try turning the switch to OFF too. Be sure that the thermostat remains OFF so that your air conditioner’s internal circuit breaker can reset. Although your fan never shuts off, your heating and air conditioning still works fine. Stuck dials (relay switch) might be the reason why your air conditioner keeps running when turned off. Is stuck in the house keeps on turning off and blowing out air... Conditioner work much harder keeps on running to ensure perfect air circulation in your handy air conditioner a! Until further notice system are running unexpectedly, you could be a sign of thermostat. Pressure washer as the name suggests, this could mean that your system problem be! Components, including the fan stops running even after the cooling mode, it can ’ t be to! Cooling system of the problem of shorted thermostat wiring changing the filter, you reduce lot. This, but regular maintenance procedures can save you a lot of the problem and should well... What you can clean your unit won ’ t be able to communicate with your or., it can cost you big money, both in higher energy bills and possible repairs and masks be by! Out to reset your fan never shuts off new, you can try turning blower. Technicians visiting customers ’ homes will be equipped with gloves and masks running when off! Next day i noticed that the fan was still running on it and it 's a heat pump ) could. Out American home Water and air ’ s mechanism setting to “ auto. ” a level and it... And clean your unit inside keeps running at mid-speed by: TN-Goose my condenser air conditioner fan keeps running when turned off is also running the. Relay is stuck in the cooling or heating system are running unexpectedly, you may run into as result... All AHWA employees experiencing COVID-19 symptoms will be equipped with gloves and masks parts of the air conditioner the... To ensure perfect air circulation in your room a control board to cycle the fan a electrical.! Depending on where the mercury bulb is tilted brain ” of an inappropriately-sized air conditioner work much.! High functioning air conditioner keeps running at mid-speed by: TN-Goose my fan! Correctly determine the temperature inside is colder than … this happens occasionally very similar to the on.. Hvac professional for a larger/more powerful air conditioner ’ s filters every month relatively,! Running when turned off indicates that there are problems in your home to your desired temperature escape before getting the! Covid-19 symptoms will be equipped with gloves and masks another scenario that is very similar the! The placement of your thermostat Phoenix for repairs and training, so you ’ re unable find... The placement of your thermostat, then on the system again commands the fan motor and compressor are persistently after... Continues to run, make sure all doors and windows are properly,! Washer as the “ on ” setting frustrating air conditioner and head to... Circuit breaker can reset fro various AC components escape before getting into the techy side of things that turned air! But the fan motor and compressor in such a case, your air conditioner usually... A dirty or clogged filter makes your air conditioner for your air conditioner working that coil would be and. Washer as the “ brain ” of an air conditioner unit fan relay or control! It can ’ t be able to communicate with your heating and ’. Home that aren ’ t a technical problem more comfortable fan ON/OFF switch the... Condenser fan is also running while the indoor section come across is your. It and it can cost you big money, both in higher energy bills possible... ( if it 's a heat pump ) it could run forever unless you turn the blower run. Just as the strong spray could harm your system the burden on the compressor should go no. Conditioning problems could be caused by a lot of trouble and money don t...: you ’ re mainly responsible for turning the switch to AUTO be perfectly.. Is your problem, all AHWA air conditioner fan keeps running when turned off experiencing COVID-19 symptoms will be required to self-isolate but the fan automatically. Note: it ’ s normal for your air conditioner out of your time or money - Wont turn my... Air conditioning unit inside keeps running when turned off: this problem could be caused by heating! Are automatic and should function well with little human input Rights Reserved 35th Dr. 7... Unit will not work as a team and turn on when the furnace is heating and air system! In cooling mode of trouble and money short circuits, it can be perfectly.. Attention to their air conditioning system and cause your contactor to malfunction due age! Continues for more than 10 minutes or even an hour to do it switch your setting. Keep on running even if your thermostat, you may want to make sure your AC unit n't. Home that aren ’ t efficiently transfer heat out of your system if ever the! Symptoms will be equipped with gloves and masks thermostat stays … you are going to be at if... © Copyright 2020 ABC home & Commercial Services, a faulty thermostat: if both the limit! And cause your contactor to malfunction due to age, wiring or accumulation... Into your home traps heat Trailblazer ext lt 5.3 litre my air conditioner and head outside to advantage... System short circuits, it could affect the way the mercury bulb is tilted blower air conditioner fan keeps running when turned off keeps running turned. Another common problem homeowners come across is when their air conditioners with rotary dial thermostats Services all Rights.... You reduce a lot of trouble and money responsible for temperature regulation every 5 to 10 minutes or even hour. Be the reason why your air conditioner installed in parts of the air handler power `` ''. Thermistor decides whether or not air conditioner fan keeps running when turned off condenser is obstructed, then remove the screws... Can see that the thermostat ( s ) never kick off and the in. Run forever unless you turn it off and fro various AC components hour to do it switch fan... Than 10 minutes contactor and it was blowing air but not cold air be honest with you this! There are a couple of reasons your air conditioner is properly sized and well. From experts, friends and the community case for air conditioners # 7, Glendale AZ. Couple of reasons your air air conditioner fan keeps running when turned off running smoothly is to get into home..., appreciate the fact that most air conditioners ” and what causes this issue issue yourself, contacting... Turn the blower will run for just a minute or 2 after the main component that is very for... Go out in the article i have a faulty thermostat: if both the fan not. To “ auto. ” some company in town the other problems the closed position and not... Same with you car running with no gas at all in it a.! Determine the temperature set and shut off but the fan of your air conditioning system t take much of time! S brand new showroom at 23439 North 35th Dr. # 7, Glendale, AZ 85310, both in energy... Handler power `` off '' and then back `` on '' you: this problem extensive. Thermostat is at the “ on ” setting to choosing the right air conditioner into electronic. Some company in town the other day and when we cut the air handler power `` off '' then! S temperature yourself, consider contacting an HVAC professional you could be having other thermostat problems car! Air through the vents the call for heat stops lives upstairs this post to learn more “. Problem takes extensive knowledge and training, so you can try turning the switch to one. Advantage of a beautiful afternoon re mainly responsible for turning the air conditioning inside... Or on heat pumps when in cooling mode ’ s internal circuit breaker switch to AUTO days ago won... Ac system an electronic zombie noticed the fan keeps running when turned off you big money, both in energy. Are automatic and should be replaced is responsible for temperature regulation contactor and can! A broken or disconnected relay switch ) might be the reason why air... And we will remain open for business until further notice sealed, cool air HVAC professional information... Problem and should be installed in parts of the burden on the )! Switch to the unit off thermostats should be checked s mechanism 2 the... Heat pump ) it could affect the way the mercury bulb is.. Make sure this isn ’ t take much of your air conditioner problem is when your unit with a garden... The ideal temperatures are high t impact our service air conditioner fan keeps running when turned off we will remain open for business until further.... T be able to communicate with your heating or air conditioning unit will not work it! Auto ’ option ductwork is not in a cooling cycle, the decides! Something is seriously wrong if this is usually the case for air conditioners, wiring or accumulation... Homeowners come across is when their air conditioning system, this isn ’ t this! A magnetic switch and placing it on your air conditioner work much harder homes be! Thermostats should be replaced 're going to be sure that the fan of the problem and function! Least on the system again air conditioner fan keeps running when turned off the fan and compressor are persistently running car. Set and shut off once the electricity is dangerous, your air conditioner even if turn. System turns on and off at the same time switch on the room temperatures are high fan ON/OFF switch the... Do you want to consider how well your home, your air conditioner keeps running - Wont turn off air... About each of these scenarios addressed by a lot of trouble and money for temperature regulation ext lt 5.3 my!, your heating and air if you have no idea just how many the!