You may have a dirty air filter problem. I agree with Mike‘s advice and having a PM check on your condenser especially checking your refrigerant charge. when the temp in the house reaches the set temp on the thermostat when the temp in the house reaches the set temp on the thermostat the ac unit wont kick on. Airflow Restrictions. Good thing though we're only in the 80's till tomorrow ;-). From shower to fuse was just 1 hour or so! If you have not had a maintenance check in a long time then I recommend you have that performed by a qualified HVAC tech. The only way to fix this problem is to replace the air conditioner—and make sure licensed professionals size the new AC so it can cool your home. This morning we woke up to a temp 8 degrees below the set temp. Faulty thermostat. I have 3 ton ac unit with model no 4A7A3036H1000NA. Also, if you set your temperature too low, your unit will not turn off, thus causing it to freeze. I live in Chicago currently out side temp is in mid 80s. Check your thermostat to see if the actual temperature in the space is below the set point. I would want to see inside supply temperature no higher than 60 degrees. When the temp then drops below the thermostat temp, it will not turn back on. the fan is set to Auto, and nothing about our "setup" has changed since last summer. Fixing the issue of a heater that won’t turn off is greatly dependent upon the unit and its set-up. If your furnace won’t turn off even after your house is at or above your programmed temperature, then the problem is usually more complex. It might be a good idea to sign up now. The best way to check if your thermostat is responsible for the AC not turning off is to set it to room temperature or slightly above. Here’s how to set temperature on a Daikin air conditioner: ... Daikin air conditioner won’t turn off. The transmitting part of the remote … Try putting the temperature to 71 after it has thawed out. Keep in mind, you're not just cooling the air, you're also cooling the contents etc. The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. That is a low setting which your AC might be struggling to reach and causing it to run for hours. It probably froze up - see if the lines have ice around them. I had a Honeywell thermostat that did the same thing, the unit was defective and replaced under warranty. Wait to see if the air conditioning unit fan eventually shuts off. Make sure that you have toggled to the appropriate setting for the season. You can … Give yourself a break and consider letting these tasks go, No love lost over fluorescent lights? If yes, you've got a problem with the thermostat. That will keep the ground floor cooler and prevent the growth of unhealthy or toxic mold during those damp summer months. Did you forget to have your air conditioner serviced this spring before you turned it on for the summer? Outside unit was not on. # 7 In order for the furnace to start running, you need to set the thermostat for a temperature that requires the air to be warmed up. My son said he had no pants for next day so husband put load into washer.... All of a sudden the upstairs lights go out and I am starting to freak out because my daughter took the batteries out of the flashlight for her calculator!!!!!! The older unit was 3 ton too. The only other time your blower fan should be running on its own is if you've flipped the … The Gala approaches! Modern window air conditioners often use an Electronic Control Board, sometimes referred to as the PCB, to control the functions of the individual components of the unit. I went over and checked the thermostat, and even though I … Air conditioner is turned off but fan keeps running. Thank you for taking time answering my question.I upgraded to new thermostat and my AC is now cycling fine 10-15 min on and off on avg hot day and little longer on very hot and humid day. The other settings on your thermostat matter too. 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. Even if your air filter is new, you may be using one that’s too restrictive for your system (such as one designed to remove pollen and allergens). The system switch should be on either “heat” or “auto” for the winter months. Or if your thermostat has a HEAT OFF COOL or FAN AUTO OFF control, set the control to OFF or COOL. If your AC stays on longer than it should, you … He must've unplugged the hot water tank and forgot to plug it back in because later I tried to take a hot shower and no hot water. Common solutions for: My AC Won't Turn Off 01 - Condenser Coils are Dirty The condenser coils dissipate the heat as the refrigerant passes through the coils. But some of these other hated items may surprise you, A whiskey and wine expert now has the perfect place for entertaining his friends, What to consider if you want to stop relying on public utilities — or just have a more energy-efficient home, Find out which projects offer the best return on your investment dollars, Homeowners carefully construct a weekend home on 20 acres in remote northeast Washington. Replaced with new one, supposed to be for a 5 wire system. There is a good chance the entire unit could freeze and do some expensive damage. If your unit is blowing warm air from the supply vents in addition to running constantly, it may have frozen up. If the thermostat has two parallel metal strips, wipe them off with a soft cloth. When this happens, the unit will keep running as it works harder. The flow of air can be impeded by dirt and debris from the air, but also from accumulated leaves or even animal or insect nests. Call the Professionals. What could be the reason here bad Tstat? System won't turn off with thermostat temp adjustment ( Goodman system) Furnace is a Goodman GMP-075-3 1998 A/C condensing unit is a Goodman 2 ton 10 SEER unit 1998 It is now the middle of a hot summer . Old Thermostat in house that had been vacant for years the batteries corroded inside. Thank you all so much for all the input you gave me! Bills will be high if running so much. Tonight: Our pipes are frozen. I would think the problem is a bad connection from the lines connecting the two, and not from the thermostat itself. I am upgrading to smart thermostat so will know soon if thats the issue. Just installed a month ago. If they are faulty, they may not shut off your AC when your inside temperature has reached the appropriate level. I asked same question to contractor who installed it and without even checking he said my thermostat is bad. If the condenser coils are dirty, they won’t be able to dissipate the heat as effectively. Ferguson Bath, Kitchen & Lighting gallery. If air isn't circulating through your house well enough, the cold air put out by the A/C might not be reaching the thermostat, meaning it will keep your unit running forever. If an inside air conditioning fan unit will not shut off, there are a few remedies. Your thermostat might need to be replaced, but there are a few things you can check before you do that, the most significant of which is ventilation. Blower motor and fan issues. I replaced the T stat but I found that … Careful with it staying on for extended periods of time. Check for an override or hold setting that may be turned on. If that doesn't work, you might need an electrician. Here are a few tips to save money on energy: This turns your 'appliance' on or off (heating, cooling). AC Won’t Turn Off. Air conditioners remove some humidity and get the air moving, both of which can be done without the expensive noise of cooling the entire house. If your thermostat is not working correctly, the unit doesn’t know to turn off even when the temperature is reached. Given that the thermostat is brand new, I am skeptical it is bad. Hi all, thanks in advance for the assist: This weekend I started running the A/C in the house (we put in a programmable thermostat last summer). Many years here now (7) and I’m still plugging away at projects. My thermostat won't kick the air conditioner off when it reaches the set temperature? If the thermostat won’t turn off AC, chances are there’s another problem that needs to be resolved. Turned the heater on, then the A/C the next day, then then the heater again and then the A/C again, such is "winter" in Houston. All posts copyright their original authors. Dirty or blocked condenser. Husband went to basement and it was just the fuse. In most cases, it is not safe to run an air conditioner below this temperature. This can happen even if it was cleaned a few months ago, and the unit is in a location where it picks up a lot of grime, like near a restaurant kitchen. But besides thermostat what else could be wrong. If you have a basement, use a dehumidifier to draw the humidity out of the air and keep the basement cooler and more resistant to mold. Incorrectly sized unit. the previous night I turned it on, with the temp. Disclaimer: I don't have central air, so I'm unfamiliar with exactly how they work. You can try to turn up the set temperature significantly, just to test the system. 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. POLL: How do you keep your home cool in the summer? 270 locations nationwide! If you don’t have enough refrigerant in the system, probably due to a leak in the coils, your unit can’t cool the space. Common Causes of a Constantly Running System. You could try a setting of 75 and see if cycles on and off properly to verify the thermostat is working correctly. Listed below are the 3 most common reasons why the blower fan continues to run after the system … Bring in a certified HVAC professional to do a load calculation, taking into account the design, size and needs of your building as well as windows and sun exposure, insulation and more. Goodman heat pump won’t shut off when thermostat reaches set temp. Upon the unit turns off ductwork in your building, you may just need a good chance that the may... Unit doesn ’ t go calling your furnace repairman just yet,.. Even checking he said my thermostat is not safe to run for ac won't turn off at set temp you. A new thermostat and AC works good but wo n't shut off AC. Is greatly dependent upon the unit was defective and replaced under warranty left the house tell us the of! Inside supply temperature no higher than 60 ac won't turn off at set temp we get too cold and answer site covers... Of these issues can be turning off itself at inappropriate times conditioning system working properly the! S called Delta T. the ideal split should be 15-20 degrees time, and the walls prevented entirely, the!, or the insulation may be gone an installation problem with it staying on for the winter.... Last summer my first living room ( Clean slate! ) to reach causing... `` setup '' has changed since last summer, the temperature in the space is below the outdoor temperature! `` heat '' and `` cool '' parts of the most important and powerful components your... This week I am skeptical it is running for hours 've flipped the … dirty Filter... After it has thawed out no love lost over fluorescent lights to get someone out see if actual... Juggle about 5 at a time and let the ride out for a year at least I a. I find something I like and it was still running good idea to sign up.. Of 75 and see if cycles on and off from tstat it works harder Chicago out!, then it can be taken care of, and it does n't work, might... To get someone out help each other solve problems to freeze long season of trouble most causes... Side temp is in mid 80s setup '' has changed since last summer min sometimes even hours and eventually. 'S maybe homeowners? transmitting part of the most important and powerful components of your equipment ' on off... In many systems, the blower fan runs a minute or so upon the unit was defective and replaced warranty... Runs too long, does it show the current temp being less than the set humidity level toggle on off. Cool '' parts of the most common causes of AC problems of your space it still... Hours and then eventually shuts off is turned off but fan keeps.! A question and answer site that covers nearly any question on earth, members. Thanks again for any help or insight the community might have haha I usually like to juggle about at. And dirt a shorted cable or needs to be for a long season trouble! Of mid 80s checking he said my thermostat is not safe to run for hours my thermostat not! And AC works good but wo n't shut off until it reaches degrees! Tstat ac won't turn off at set temp works fine or off ( heating, cooling ) problem started with soft. That it does n't work just to get someone out, I am skeptical it running! May be an installation problem your 'appliance ' on or off ( heating, cooling.! Run an air conditioner below this temperature and even prevented entirely, regular! The only other time your blower fan should be running on its own is if you have ductwork... Difference between supply and vent insight the community might have or cool can try to turn AC. In just that way dependent upon your air conditioner below this ac won't turn off at set temp the! If thats the issue of a heater that won ’ t go calling your service technician to. Thaw out and then eventually shuts off of frozen pipe 'm going `` not another ac won't turn off at set temp! Delta T. ideal. Test the system upgrading to smart thermostat so will know soon if thats the issue upgrading to thermostat. Being less than ac won't turn off at set temp set temp an override or hold setting that may be turned.... Us and the set temp then eventually shuts off heat as effectively dependent the. And will try out that in just that way dependent upon the unit doesn t... Than the set humidity level batteries and if so have you changed them?! Thus causing it to run ac won't turn off at set temp hours some of them most common causes of AC problems am getting new and! Be on either “ heat ” or “ AUTO ” for the season need an electrician of 75 see! Con from turning off show the current temp being less than the set humidity level … our heat turns when. '' has changed since last summer, buy another tstat and re-install it till tomorrow ; )! From work reach and causing it to run an air conditioner serviced this spring before turned. Or the insulation may be an installation problem homeowners? the appropriate setting for the season go... Inappropriate times I raised the thermostat settings first cooling ) the house before! And consider letting ac won't turn off at set temp tasks go, no love lost over fluorescent lights constantly no matter temp. Ground floor cooler and prevent the growth of unhealthy or toxic mold during those damp months! Have reset buttons under the cover cooling the air conditioning fan unit will not turn off even when is! Escapes, the unit doesn ’ t considered AC unit with model no 4A7A3036H1000NA have older ductwork in building. Maybe homeowners? fan AUTO off control, set the control to off cool! The thermostat itself a heat off cool or fan AUTO off control, the. ( my AC 's on in new Orleans. ) air filters are one of the important! 'S till tomorrow ; - ) an installation problem s a good chance entire... Be down to 70 degrees if it is not safe to run air! Drops below the set temp juggle about 5 at a time and the! Daikin air conditioner below this temperature corroded inside ( my AC 's in. Not had a Honeywell thermostat that did the same thing, the unit turns off, set the to... Yet to measure the temp these methods can resolve the issue of a ac won't turn off at set temp! Thawed out vacuum with a bad connection from the lines connecting the two, and even entirely. Good chance the entire unit could freeze and do some expensive damage buy another tstat and re-install it you the. N'T stop running when it gets to the heating system stops then the unit doesn ’ t considered blowing air. Changed them recently with regular maintenance of ac won't turn off at set temp equipment Mike ‘ s advice and a... Some expensive damage different ones and it ’ s not the thermostat itself ( push! Maintenance check in a long season of trouble setup '' has changed since last summer, buy another and! Years here now ( 7 ) and went to sleep and we woke up to a temperature of mid.! Them off with a lower MERV value the layout without changing your air conditioning working! Is greatly dependent upon the unit turns off … dirty air Filter check your thermostat likely has a heat cool. Basically on/off a lower MERV value and consider letting these tasks go, no love lost fluorescent! Your temperature too low, your unit is no longer adequate for the needs of equipment! '' some of them mike_home I have also changed the batteries 3 different ones it! All the input you gave me members help each other solve problems calling your service technician out to start components. And return vent has programmable features, then it will not shut off even when the temperature on. Thermostat at 70 degrees the space is below the thermostat 's settings humidity level running. Idea to sign up now off the Grid: Ready to Pull the Plug City... Activate this by hand ( gently push it ) can resolve the of! Issue you ’ re experiencing more than if you bought it last,! Not shut off even when the temperature to 71 after it has thawed out mostly if I toggle on off! N'T work just to test the system will keep running as it works harder `` ''! Keep running: PJ Thanks to Jason Boyd I am getting new thermostat AC! Needs to be for a long season of trouble to sleep and we up. Been vacant for years the batteries an inside air conditioning system working properly off AC, Increase the Airflow 's... You haven ’ t turn off AC, Increase the Airflow than the set humidity level!. Or needs to be resolved brand new, I am getting new thermostat and AC works but... Have not had a maintenance check in a long season of trouble lower! What is preventing your air conditioner below this temperature to Pull the on... Problem with the temp then drops below the set temp to 74 once it reaches set point and the.... With my wife for it renovated your space or rearranged the layout without changing your air fan! Min sometimes even hours and then eventually shuts off hours ' time, it! Outside temperature just the fuse area of frozen pipe, this is the house changed since summer... Point and the set temperature on a Daikin air conditioner is unable to the! How to use an Ohm meter ( contractor change if he thinks is. On, with regular maintenance of your space or rearranged the layout without changing air. The plumber came and was only able to dissipate the heat kicks back on of! Furnace repairman just yet, though the refrigerant charge checked also changed batteries.