The fan should not run with only one side powered. 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. If your fan is running constantly, the heat exchanger never gets a chance to cool down either which can cause serious issues. This may indicate an electrical issue that will need to be fixed. We noticed that our outside ac unit runs (the fan) even though the thermostat control is set to "off" inside the house. 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. Did Your Outside AC Unit Break Down But the Inside Unit Still Runs? Why you can’t afford to ignore your AC running constantly. 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. The problem: You have a bad fan motor and/or bad start capacitor. The condenser fan outside does not come on, so i used a stick to make it run, and it did ! … 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. Usually an AC mechanic or tech company will come out and check the refrigerant with industrial gauges for about $30 dollars. The fan should be disconnected and the three wires should be checked to ground. *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. If it’s extremely hot outside, your AC may be unable to catch up with the … If the outside AC fan won’t spin, the entire unit is functioning inefficiently or not at all. Signs this is the problem: Air from vents is cool but the airflow is weak. Unit Not Receiving Power – If you have a split AC, there is a possibility that the outside unit which … 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. What's your goal: comfort or efficiency? The thermostat seems to be working the way it should. Background: I had a new outside AC/Heat Pump unit installed about 2 years ago. For more info including a troubleshooting guide, … As air conditioners get older, they begin to lose their ability to … Outside temperature is high. The motor could be going bad or its run capacitor. 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. 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. If the bearings of the evaporator fan are grimy or dirty, the fan doesn't turn as freely as it could. The only exception is defrost (heat pump in heating mode only). The only way to stop it is when I flip off the power at the breaker box. Here are 4 common causes of an AC that constantly runs and never delivers. 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. That will keep the air in the house mixed up so you don't get hot spots and cold spots. In that sense having the AC run periodically is not actually crazy, mainly just to keep the humidity down. 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 outside unit stops working, but the inside unit is still running, with the blower fan operating, you’re still out of luck. If you haven’t had your A/C serviced in a long time, you could have very dirty evaporator … If the motor is intermittently stopping then it … Your split-system cooling system can’t operate unless both units – the indoor evaporator and the outdoor condenser/compressor – are operating. Malfunctioning Thermostat – A faulty thermostat can cause your AC fan to run constantly by not knowing when the desired temperature has been reached. We currently have the system shut off at the breaker to prevent it from running. Air conditioning units have two main components, one that cools the air, and another that distributes the cooled air around the house. When the a/c is off the fan spins but not too fast, it does goes fast when the a/c is running. thought i fixed it. The first is that the contactor on the outside condensing unit is frozen closed. During annual maintenance, we’ll inspect your condenser unit for any problems and clean off any dirt that has built up over the year. On the other hand, if your fan is set to Auto, that means that the fan will only come on when the AC does. 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. It is considered OK to continuously run a furnace fan. Once the AC cools your home down to the temperature you’ve set, then both the AC and the fan will shut off. Its job is to cause motion, and that motion moves the air. 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. You can think of the motor on a fan just like the motor in your car. I called the AC guy and the fan was hard to spin so he replaced the fan motor. The only thing I can suggest is (with the power turned off), check where the fan wires are connected. Dirty Coils. While inspecting the fan, first check the bearings. The same goes for running the fan in the winter months. Actually, the opposite is true. If the condenser fan is still always running, then it would appear that something may be miswired. To do that, it will run longer in order to maintain a constant, desired temperature in your home. The fan on my Trane outside air conditioning unit is always running. Has someone recently done work on your outside A/C unit? 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. You should be able to use a single switched or double pole switched contactor. Homeowners should experiment to see if it works best for their home to have the furnace fan running continuously or not. One problem that you may experience with your outside air conditioner is when the fan does not come on. 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. This does not seem to happen at other times of day. Cause #1: Restricted airflow/low blower speed Scenario A: Compressor works, but the fan does not spin. If comfort is your goal, leave the fan running. We'll diagnose your unit and provide a fair quote for the air conditioning repair. Restricted/reduced airflow. 2 months ago I noticed the outside fan was not spinning when the compressor was running. When your AC’s running constantly, it’s also running up your electric bill. There are two reasons for the outdoor fan to remain on while the system in side is off . A start capacitor is an electric device that gets the electric motor running at startup by providing a "jolt" of stored electrical energy. The house stays nice and cool but the fan doesn't turn off even when I turn off the a/c. When the panels of the air conditioner are removed to reveal the evaporator fan compartment, give the fan a turn by hand. Is this a problem with the unit, or the thermostat inside the house? but the fan speed was slow compared to the other unit and the air coming out was not warm like the other unit - and then within a few minutes the fan turned off again. More cold air is circulated throughout the house causing the need to hike your heat up. Answer 4 – A bigger air conditioner unit is not always better when it comes to HVAC equipment. If kept running in the hot summer months, the fan will be blowing hot air all over your house. Have them come out and check your A/C before you buy a new unit of course! Inside your air conditioning unit, the fans turn with the assistance of motors and capacitors. 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 fan should always run while compressor is working. If homeowners find this is beneficial, it is generally suggested to only run … 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 … Your air conditioner is getting old. 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