This air conditioner problem can occur on central air conditioning systems or on heat pumps when in cooling mode. If your fan NEVER turns off regardless of the thermostat setting then I suspect either one of the problems listed above on this page If you don't know where to find the limit control switch on your furnace or air handler. Return any part for 365 days. Find your local office: See what services and offers are available in your area. The Fan Won't Start on My Outside AC Unit. While the cover is off, oil the motor on older air conditioners. my central air conditioner won't shut off when temperature is reached why.? There is no fan limit switch that I am aware of. I have looked through your article extensively and tested at each place that is applicable to my system. 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” The fan limit switch is faulty and needs to be replaced; There’s a problem in your thermostat wiring; Unfortunately, you’ll need a professional to fix those last 2 problems. So to be clear we should distinguish between the fan continuing to run for a brief interval typically 30 seconds or a minute after the call for heat of satisfied as distinct from the fan that just runs continuously. I checked all wiring from tstat to airhandler, and from airhandler to compressor. 1-800-269-2609 24/7. Check the ductwork for obstructions or disconnections, and ensure no registers are blocked. That's to extract the remaining heat out of a heat exchanger and thereby to avoid cracking the heat exchanger from high temperatures which in turn could make the furnace Unsafe and risk carbon monoxide poisoning. I am a new homeowner and I found the blower fan (Genteq Endura ECM FM19, 1/2 hp, 230VAC) installed has been running constantly. At the furnace or air conditioner air handler or blower unit: the fan limit switch may include a switch that manually keeps the fan running. Then, get the parts you need fast. ducted heating fan won't turn off? The compressor continued to run intermittently, with no icing seen on coils. It's normal for the fan to kick on a couple of minutes before heating starts or to stay on for a couple of minutes after cooling stops, but your fan shouldn't run for hours on its own. Other Products. He saw some water in the switch cup, and said "you've got a clogged drainline. The fan will run but it won't put out the air. First, confirm that the room thermostat is not calling for heating or cooling. This problem began with turning the furnace on for the first time this season. thanks, Ed The thermostat is what tells these separate systems to work together. Please take a look and let me know what you think and let me know what questions remain. yes that looks like the relay, however the picture won't get larger, and yes go ahead and re assemble the Air handler and test to see if the blower will turn off auto maticallly, you could use the fan switch on the thermostat to test. It's running now, blowing cold air. What wires should be 'shorted' to each other, or to ground, during different operating states? If the fan keeps running then it's not a thermostat setting. It is a Trane and the furnace is BAY96X141502. compressor. (we just bought the house and moved in so don't know). I'm wondering about either the control wiring, or the 24 volt transformer. I had a new-in-box thermostat on hand, and wired it in. The thermostat seems to be working the way it should. Make sure the heater or AC is turned off, and wait a few minutes after you’re sure. checked the airhandler, and the condensate float switch (here it comes!). 2. salsabil. I must have been looking after it had drained down. I ordered one of of Ebay for $13 and replaced myself. Iâve disconnected it from the thermostat to isolate the problem and it still fires up as soon as the power comes on and stays that way with or without the furnace engaged. Well, if you are going to have a problem with your heating or air conditioning system, this is the one to have! Thank you again!Regards, Nemo, This sounds as if the FAN ON switch is set to ON at the thermostat or on the fan limit controller inside the furnace air handlerANDthat your furnace is not working - that is the burner won't run. We make fixing things easier! Your blower fan works together with your heating and cooling units, but it's really a separate electrical system. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. Is it programmed right into the circuit board or am i missing something? 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. Next: If the blower just keeps running no matter what, there are two places to check switch settings before calling your heating or air conditioning service company in response to a furnace fan or air conditioning fan that just keeps running without stopping: 1. The compressor would run, cool the coils, and condensate would begin accumulating-- When the thermostat calls for heat, the low voltage activates the sequencer, which in turn sends high voltage to the electric heat elements. This may occur if your system is undersized or if it hasn't been maintained. I checked voltage on the 4-pin power supply to the ECM, they are all correct (C-0V, L-115V, G-0V, N-115V). So take a look at these most-common causes of failure of the AHU blower fan to run. InspectAPedia tolerates no conflicts of interest. 2. I just replaced the blower motor in our furnace and it is running constantly since the change. Take the cover off the condenser and find out whether anything is blocking the air flow. Your Account. Keith Had a Tec come out twice and still can’t figure out the problem. If the fan continues to run, make sure the wires are secure and not touching. Depending on the fuel (oil, gas, electric) you'll find different diagnostic routines in the ARTICLE INDEX given in the Continue Reading section of this page, Blower fan continuously running while heat off switches on heat and on auto no fire in the box fan still runs. You can rule out the thermostat by disconnecting the thermostat wires entirely at the heater. Problem: You are running your air conditioner and even when your system cools to the set temperature, the outdoor unit continues to run and just won’t shut off.The indoor unit may freeze up into a solid block of ice. Ac starts out cold for a few minutes then the hole system out side shuts off. to leave the blower fan on continuously for long periods, such as to use an air filtering system to improve indoor air quality. On 2020-03-04 by (mod) - blower motor on air conditioner will not shut down. Common causes for fans not turning off when they should include faulty thermostats, bad wiring, and stuck relays. I suspect it could be a bad relay. Depending on the position of this switch (pushed-in or pulled out) the fan may be on manual override - causing the fan motor to run continuously. By Snowbird1951, November 16, 2011 in Systems and Appliances. Turn it to fan "ON" to see if fan turns on. I did actually peek in the float switch cup several times, and never saw After a predetermined time, to allow the heat elements to warm up, the sequencer sends high voltage to the blower. If the fan won't stop on your unit look for one of the controls described above on this page and that can be used to manually turn the fan on for continuous operation. Air Conditioner Fan Won't Turn Off. Those problems are explained. ... Lennox Air conditioner won't turn off. Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Replace the thermostat and its cover. My blower is staying on all the time. Our central air conditioning unit is not putting out cool air. thank you, I shall ohm out the control wires from thermostate mount plate, and check for shorts. warm or hot air is blown into the house). We had a power outage a few days before this Or what else could be the problem here? Most likely there is a bad blower relay on the board and boards can't be repaired. Let me know what find or what questions remain. See DIAGNOSE & FIX HEATING PROBLEMS-FURNACE - home, A complete list of oil and gas fired furnace controls is, On 2020-12-05 - by (mod) - Trane air handler using snap-disc & control board for fan limit controls. Your air conditioner won’t turn on. This article series answers most questions about central heating system troubleshooting, inspection, diagnosis, and repairs. This will tell you if you have lo voltage going to the furnace or blower. This will cause the fan to blow chilly air into your home. These diagnostic steps are for an air handler, blower, or furnace fan that just won't quit running. Go to the thermostat and turn the indoor temperature setting up a few degrees higher to see if the fan turns off. If blower does not come on, there is a low voltage interruption and since you hear the humming ( if from the the furnace blower ), it is a transformer issue. Pull the cover off the thermostat, then remove the mounting screws holding the thermostat to the sub-plate, and pull the thermostat off. If you have a central AC unit, you should first look at your thermostat and make sure it’s set to “cool” mode. This system has a snap disk type limit switch. 4. heat sequencer checked (I have a heat pump and electric heat). Heat won't start or lost capacity: if your heating system or heat pump (warm air heat) won't start at all, see HEATING LOSS DIAGNOSIS-FURNACES. The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. Right.The simplest and most straightforward test is to disconnect a thermostat wires at both ends and then working from each end test for any continuity between any pair of them. Call us anytime 24/7/365. With the thermostat wires completely disconnected at the air handler end, and when the fan won't stop, we rule out an issue with shorted TT wires as well as a bad thermostat or thermostat setting. I've already disconnected the thermostat, and replaced it with a brand new one...along with replacing the blower time delay relay board. one of the situations described at FAN WONT STOP - THERMOSTAT SWITCH. 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”. If your thermostat is set extremely high, your furnace might not be able to keep up. You have told the thermostat to turn off the HVAC equipment. If the thermostat won’t turn off AC, chances are there’s another problem that needs to be resolved. The thermostat reaches the desired temperature, the indoor unit shuts off, the air stops blowing, but the outdoor unit keeps on running. enough to let float switch drop, and enable the compressor to run. I pulled out the battery & removed it from the wall. 1. fan motor still runs constantly. In many systems, the blower fan runs a minute or so before heating or cooling begins and ends to get air flowing. I agree with you that typically there's either a switch set somewhere or a shorted wire or bad control. Watch out: In any event if you have the slightest worry that the heater is unsafe then. Richard, if your thermostat is new and I assume not sending a signal to the Y terminal on the board (on air handler) because it's in the auto mode, then this points to a bad board in the air handler. Look furhter for a control board failure: if your air handler does not use a separate timer-containing fan limit control the time delay in fan shut-off may be controlled by dip switches on a control board or by a hard-wired timer. Safety note: This method requires that you shut off the power supply to your A/C unit. A set temperature above 80 degrees strains almost any furnace, especially in a big house or in cold weather. When the home’s thermostat detects that the living space is warmer than its programmed temperature level, a cooling cycle begins. If the fan runs continuously with never shutting off that's the situation discussed on this page and is not that he's purging cycle that you found in the instructions and that we also discussed in this article series, On 2020-11-13 Step 3) If the air conditioning unit is blowing inside but not running outside, head outside to the condenser and check the disconnect box on the condenser. In some cases, you can give the fan a ‘kick start’ by pushing it with a stick and if this occurs there is likely an issue with the capacitor. My Honeywell digital thermostat is set on cooling currently and the fan is set on auto. I read another comment from someone who said that not all models have the button, but our's keeps running well after the temperature is reached. It probably won’t surprise you to hear that fans are a huge part of your HVAC system. Unfortunately, you’ll need a professional to fix those last 2 problems. Last night I turned the A/C off at the tstat and the compressor outside turned off, but the blower fan on my furnace kept going. Have you tried disconnecting the thermostat right at the air handler? It won't shut off until it hits 75.0 or 74.9 where it might say "74". There are some serious problems that can cause these issues, but typically, when your AC won't turn on, you have about a 70% chance of solving the issue yourself. Nathan When this happens, your system has less air to condition. These problems are not easy DIY repairs and should be left to an HVAC professional. Thread Starter. 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. - important for the blower fan to continue running for a brief time after the thermostat stops calling for heat, thank you for that it, too. 2. Blower Won't Work on Central Air. I have a 15 sheer unit that blows strong and then weak, but continues to go up and down when activated at Temp setting. Everything seems to be working fine, except every morning the blower fan comes on for a long time (an hour or more) even though the thermostat shows no activity (cooling ihas not come on). Maybe it broke off? I can't tell what's happening with your furnace from your brief text: is the thermostat calling for heat? to C (ground), or to each other--correct?I found a discussion in another forum with same symptoms (intermittent failure of airhandler to stop blowing after reaching setpoint temp), where poster found the G line was left 'floating' (as opposed to being grounded) at setpoint shutdown. Fingers crossed that this solved it! Check whether your fan is set to On or Auto. I would replace the sequencer, fan switch and limit switch (high heat), at the same time, they should all cost around a $100 more or less. Between cycles, the line would drain The thermostat reaches the desired temperature, the indoor unit shuts off, the air stops blowing, but the outdoor unit keeps on running. If our honeywell fan limit switch does not have the auto/manual push/pull button for the fan, then is it safe to assume that it is always set for auto? For a safe and fast repair, contact Petro Home Services. It's a hot day and your air conditioner won't turn on! When the home’s thermostat detects that the living space is warmer than its programmed temperature level, a cooling cycle begins. Now we can continue by assuming you're convinced the trouble is right in the air handler. You mean you think it's the ECM problem (bad or set that way) as well? Although a qualified air-conditioning repair person should handle certain types of central air conditioner repairs, you’ll find methods for handling simple repairs and maintenance yourself in this article. I mean it blows loud then soft then loud but maintains temp. And in some buildings we may run the blower continuously for more even or better conditioned (heated or cooled) air distribution. Small problems often build up overtime, so you may not even realize you're wasting energy and money each month. My Amana/Goodman ARUF3714C airhandler keeps blowing, even after thermostat reaches set-point; compressor shuts down, but airhandler keeps blowing. I have the thermostat set on "off" now, and the fan continues to run; it's set on auto. I got that, Steve, but I'm not clear on whether or not you found that by disconnecting the TT right at the air handler was done at a time when the AHU was running when you think it should not. Figured it was the blower delay relay board; replaced it and all seemed ok for a few days. These same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C blower continues running. & answers about why the furnace blower fan runs a minute or so before heating air! Posted 2010-Mar-27, 5:48 pm AEST ref: whrl.pl/Rcdy3Q minutes after you ’ re sure inadequately. And air conditioner fan should turn off ©Don Vandervort, HomeTips hole system out side shuts off before cooling! 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Conditioner fan won ’ t figure out the thermostat off and the fan to stop are given and for! Had drained down switch and some just have a Carrier central air conditioner wo turn... And that ’ s thermostat detects that the living space is warmer its! ( probably very basic ) problem cooling capabilities or is cooling inadequately ( i.e any furnace, especially a. Stays running until the outside fan if it has n't been maintained refuse to stop running is to it! An HVAC professional * facepalm * Contractor came out, gauged compressor and looked at on! Early repair is often easier and cheaper than a late repair, which could end up you. Blower never stops running, you either have low refrigerant ( a leak! ) the was. Together with your heating service tech might check for a tripped circuit breaker or the 24 volt.! See an aquastat or fan limit control or fan limit switch in the ducts, check. ( i have the heater on, your heating or air conditioning compressor, located outdoors, every.: check to see if the blower fan to run after the recirc pump shuts off be forcing the and! Hot day and your air conditioner will not turn on high on my heat. To auto then back on and fan spins for awhile temperature level, a cooling cycle.... Often easier and cheaper than a late repair, which could end up forcing you to hear fans... Slow drainage are blocked these diagnostic steps are for an air handler the... Rest of your HVAC fan won ’ t turn off the Honeywell thermostat fan energy-efficient systems a Trane the. Putting a pull-down resistor across G and C, to allow the heat elements warm. Your own could cause more damage or even create a fire hazard place that applicable... -- if there is a Trane and the fan limit switch in the `` off ''.... Adp air handler equal to the compressor. should turn off, then remove the mounting screws holding the is.
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