Actually, the opposite is true. These fan systems were designed to run all the time and, assuming your system is properly installed with the correct size ductwork, it may even extend the life of the fan. If the actual room temperature is below what your thermostat is set for, there’s a good chance you’re due for a repair or replacement. To do that, it will run longer in order to maintain a constant, desired temperature in your home. However, it still seems strange to me that if the AC should kick on (aka the house is warming up) at all if it is 2-5°F (1-3°C) cooler outside than the temperature I have the AC set to. The only thing I can suggest is (with the power turned off), check where the fan wires are connected. Why you can’t afford to ignore your AC running constantly. We'll diagnose your unit and provide a fair quote for the air conditioning repair. Here are 4 common causes of an AC that constantly runs and never delivers. Usually an AC mechanic or tech company will come out and check the refrigerant with industrial gauges for about $30 dollars. If homeowners find this is beneficial, it is generally suggested to only run … If the bearings of the evaporator fan are grimy or dirty, the fan doesn't turn as freely as it could. This does not seem to happen at other times of day. 2 months ago I noticed the outside fan was not spinning when the compressor was running. A start capacitor is an electric device that gets the electric motor running at startup by providing a "jolt" of stored electrical energy. Is this a problem with the unit, or the thermostat inside the house? The inside temp is already at set point and drops to a couple degrees below the set point within a few minutes of the fan coming on and stays there the whole time the fan is running. When the a/c is off the fan spins but not too fast, it does goes fast when the a/c is running. Your split-system cooling system can’t operate unless both units – the indoor evaporator and the outdoor condenser/compressor – are operating. … When your air conditioner’s outside fan is not working, inspect the fan itself If all else fails, check to see if there is a problem with your air conditioner’s physical fan. Many people are under the assumption that running their furnace fan all the time will cause it to fail prematurely. The condenser fan outside does not come on, so i used a stick to make it run, and it did ! While inspecting the fan, first check the bearings. When the panels of the air conditioner are removed to reveal the evaporator fan compartment, give the fan a turn by hand. During annual maintenance, we’ll inspect your condenser unit for any problems and clean off any dirt that has built up over the year. The house stays nice and cool but the fan doesn't turn off even when I turn off the a/c. The thermostat seems to be working the way it should. Signs this is the problem: Air from vents is cool but the airflow is weak. If it’s extremely hot outside, your AC may be unable to catch up with the … If the motor is intermittently stopping then it … As air conditioners get older, they begin to lose their ability to … Once the AC cools your home down to the temperature you’ve set, then both the AC and the fan will shut off. Instead, homeowners should choose the "auto" option, or if homeowners choose to run the fan, they should do it for just a few minutes after the cooling part of the unit shuts off. If the outside unit stops working, but the inside unit is still running, with the blower fan operating, you’re still out of luck. The first is that the contactor on the outside condensing unit is frozen closed. If the condenser fan is still always running, then it would appear that something may be miswired. Malfunctioning Thermostat – A faulty thermostat can cause your AC fan to run constantly by not knowing when the desired temperature has been reached. thought i fixed it. *The stars on the cooling are because my outside ac unit has lost freon for the second time, and I'm trying to run the fan until I can coordinate a repair on this undersized and damaged unit, or preferably a new unit install. The ball bearings need to be oiled with electric motor oil If the fan doesn't turn freely. On the other hand, if your fan is set to Auto, that means that the fan will only come on when the AC does. I havn't been able to get a straight answer to this question so maybe someone can help me without having to pay another $65 service call. The bearing make it possible for the fan to spin. Restricted/reduced airflow. Scenario A: Compressor works, but the fan does not spin. When your air conditioner runs throughout the day and night without shutting off, or if it cycles on and off continuously, there are several causes for concern: Consequence #1: WASTED ENERGY. You can think of the motor on a fan just like the motor in your car. When your AC’s running constantly, it’s also running up your electric bill. We currently have the system shut off at the breaker to prevent it from running. However, if your AC is always running but you’re never comfortable, that’s a clear sign of a problem that needs to be fixed. Has someone recently done work on your outside A/C unit? The fan on my Trane outside air conditioning unit is always running. That will keep the air in the house mixed up so you don't get hot spots and cold spots. This may indicate an electrical issue that will need to be fixed. The only way to stop it is when I flip off the power at the breaker box. If your fan is set to On, that means the fan going to stay on all the time, whether the AC is running or not. There are two reasons for the outdoor fan to remain on while the system in side is off . If it’s cloudy and relatively cool outside but feeling stuffy in your home, running the fan for an hour or so can certainly help. Favorite Answer The outside fan should run in ac and in heat. Outside temperature is high. One problem that you may experience with your outside air conditioner is when the fan does not come on. Homeowners should experiment to see if it works best for their home to have the furnace fan running continuously or not. The best thing you can do to keep your outside air conditioner unit running efficiently is to have annual maintenance performed by Hyde’s. If you haven’t had your A/C serviced in a long time, you could have very dirty evaporator … It is considered OK to continuously run a furnace fan. If you don’t want to turn the fan off and on all of the time, there are some new technologies that will allow you to program the blower fan to run for 10 to 15 minutes each hour. In turn, this necessitates the need to run the AC much more often to combat the extra heat. Have them come out and check your A/C before you buy a new unit of course! For more info including a troubleshooting guide, … The motor could be going bad or its run capacitor. More cold air is circulated throughout the house causing the need to hike your heat up. Cause #1: Restricted airflow/low blower speed What's your goal: comfort or efficiency? In that sense having the AC run periodically is not actually crazy, mainly just to keep the humidity down. The fan should always run while compressor is working. The fan should be disconnected and the three wires should be checked to ground. The other answer I’ve heard is that ‘It costs just as much to run the fan on as it does when the AC is also running,’ but I thought fans … Capacitors send an electrical jolt to start a motor (a “start capacitor”) or to keep one running (a “run capacitor.”) In an air conditioning system, capacitors work with three different motors: the compressor, the indoor blower fan, and outdoor fan. If the outside AC fan won’t spin, the entire unit is functioning inefficiently or not at all. If your fan is running constantly, the heat exchanger never gets a chance to cool down either which can cause serious issues. The same goes for running the fan in the winter months. Inside your air conditioning unit, the fans turn with the assistance of motors and capacitors. Background: I had a new outside AC/Heat Pump unit installed about 2 years ago. I called the AC guy and the fan was hard to spin so he replaced the fan motor. If kept running in the hot summer months, the fan will be blowing hot air all over your house. Did Your Outside AC Unit Break Down But the Inside Unit Still Runs? I leave my fan on to keep air circulating but I’ve heard lots of different answers, including ‘The AC pulls in air from the outside,’ but I don’t think that happens unless a door is open. Answer 4 – A bigger air conditioner unit is not always better when it comes to HVAC equipment. Dirty Coils. You should be able to use a single switched or double pole switched contactor. Air conditioning units have two main components, one that cools the air, and another that distributes the cooled air around the house. Your air conditioner is getting old. To be safe – unless you have a specific reason to keep the fan running constantly, just place your central air or furnace fan setting on auto. The fan should not run with only one side powered. If comfort is your goal, leave the fan running. 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