Then choose the symptom that best describes your issue and review the list of causes. If you find the problem there, reset the breaker by turning it off and then on or replace the fuse. Possible Causes of an AC Unit Not Blowing Cold Air. Central air conditioners can work for years without problems if properly maintained and serviced annually. Reset the equipment’s switches and/or overloads. To kill algae, pour a dilute solution of bleach (1 part bleach to 16 parts water) into the pump’s trough and pump it out through the tube. Also check the thermostat. So you’ll quickly feel warm air instead of cold air at your vents. Most noteworthy, you should replace the filters at least twice a year, before the heating and cooling seasons. In some cases, it might be easier to replace it with new 1/2-inch tubing purchased online, at an HVAC supply shop, or at a well-stocked home improvement center. Never use a power washer for this—it can damage the fins. So, you do some investigating and realize that even though the outside unit is buzzing, the fan isn’t spinning. When there’s water under the evaporator at the base of your furnace, the drain is probably clogged. Outdoor compressors sometimes make buzzing, humming, or grinding noises. If your central air conditioner won’t go on automatically when the thermostat signals the need for cooling: 1 Check the main electrical panel and any secondary circuit panels for a tripped breaker or blown fuse. If you find the problem there, reset the breaker by turning it off and then on or replace the fuse. Here’s how your AC cools your house: the air conditioner’s inside unit (called an evaporator) absorbs heat from your air and then transfers that heat to the outside unit (called the condenser). Free repair advice! If you turn your central heating system on and set it to the desired temperature but it doesn’t deliver any air, you’ll have to attempt to isolate the problem. By keeping your AC unit working well, you can save energy and, as a result, money. If your central air conditioner will not turn on, try to troubleshoot the problem yourself before calling a serviceman out to your home. Hire an electrician or HVAC contractor to track down and solve this problem. Be sure it is receiving power at the electrical panel. Having a broken HVAC system in your home or office can be a source of great discomfort and inconvenience. Next, check the air handler: 1 Turn off the power to the air conditioning air handler or furnace. The following are guidelines; always refer to your owner’s manual. Check your thermostat settings … If necessary, loosen the motor mount to change the belt. Click to buy on Amazon. Central Air Not Working? We discuss the following common ones below: Clean the central air conditioning compressor, located outdoors, before every cooling season. Finally, some blower motors need oiling. What could be the problem? A Blocked Outdoor Air Conditioning Unit. Then you can re-tighten the tension once the belt is in place. The contractor you get in touch with to repair the system will ask you for full details about the problem. This indicates that the capacitor is bad and needs to be replaced. If you see ice in the area around the coils, close the unit back up, turn the power back on, and turn on the fan. Call a qualified local AC professional—this is not something you can do yourself. This is an easy enough fix, as all you need to do is flip the circuit back or replace the blown fuse. The AC compressor is the heart of your air conditioning system. One room is hot and the rest of the house is cool. If your owner’s manual calls for lubricating the motor, do that now—but don’t over-lubricate. Whether or not this is the cause of the problem, it’s a good early remedy to try. Make sure it's plugged in. The outside temperature is 90F degrees. A new one costs about $50. Central AC Not Working At All If your central air conditioner won’t go on automatically when the thermostat signals the need for cooling: 1 Check the main electrical panel and any secondary circuit panels for a tripped breaker or blown fuse. AC problems usually happen in a heat wave, when you need your AC the most and when HVAC repair people are very busy. AC won’t turn on. And when your AC isn’t getting enough airflow into the system, it causes a whole host of AC problems and can eventually lead to complete system failure. A central air conditioner typically connects to a dedicated 240-volt circuit. Try turning on the thermostat and adjusting the temperature so that your HVAC is turned on. Once you understand the most common issues affecting central heating systems, you'll be able to troubleshoot them yourself and know what you can fix and what’s best left to the experts. How Does Central Air Work -- In More Detail. Vacuum the interior of the condenser, and then flush it with a garden hose. This video shows how to replace the motor. Don Vandervort has developed his expertise for more than 30 years, as Building Editor for Sunset Books, Senior Editor at Home Magazine, author of more than 30 home improvement books, and writer of countless magazine articles. If the air conditioner runs constantly, here’s what to do: If you set the thermostat a few degrees higher, you will save energy and a lot of money when it comes time to pay your electric bill. Check the furnace filter and blower to see whether they’re blocked. One room is hot and the rest of the house is cool. The fan (only) should come on. Please be sure to take safety precautions when doing this so that nobody gets hurt. By jlacaeyse, July 30, 2013 in Systems and Appliances. Then: If the unit turns off, either the thermostat is broken or it is wired improperly. Here’s how you can replace the air conditioner’s blower belt: 1 Turn off all power to the unit and, if the air handler is a gas furnace, turn off the gas at the gas valve that serves the furnace. Heater Not Working. However, if it stops working completely and you aren’t sure why, troubleshoot before calling a pro: Check the circuit breaker or fuse box to find out whether the unit has power. Once you understand the most common issues affecting central heating systems, you'll be able to troubleshoot them yourself and know what you can fix and what’s best left to the experts. Turn on the thermostat and set the temperature so the heater comes on. 1-800-269-2609 24/7. 2 Remove the door on the front of the air-handler cabinet so you can access the air filter. If your AC doesn’t turn off when room temperature reaches the temperature set on the thermostat, the problem is generally occurring either at the thermostat or in the electrical system that runs the outside condensing unit. HomeTips.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. A dirty air filter means that the central air system has to work twice as hard to push air through a clogged filter. If the compressor doesn’t go on when you hold the Y wire to the R terminal, turn the power back off and either call an air-conditioning technician or check the capacitor as discussed next. Unscrew the check valve, loosen the ball inside, and look for an obstruction and a build-up of algae. There are a variety of things that could cause your AC to not cool your home properly. Hey, if we didn’t answer you question yet, check the conversation board at the bottom of this page…lots of new answers and help there! If you can hear your central air conditioner running, but it doesn’t cool well or at all, make sure nothing is blocking or limiting air flow anywhere in the system—the air filters, registers, and the compressor. Central Air Not Working. Actually, you might have blown two fuses: the literal fuse connected to your thermostat and, if you're angry about your AC not working, an internal "fuse." Water can also puddle around the unit or flood the area. If your AC doesn’t go on at all when you set the thermostat for a cooler-than-room temperature, please read Central AC Not Working At All, above. Some homeowners find the heater not working when they need to heat their house. If your unit is working overtime to cool air that’s escaping through holes in the system, you’ll notice a spike in your electric bill. Another common and easily remedied situation that sometimes results in a central air conditioner fan not working is a dirty, clogged air filter. You can clear it, but it’s probably easier just to replace the whole thing. Then check the door switch—a small switch inside the metal door that prevents the appliance from running when the cabinet is open. This is not necessarily a death sentence for your HVAC unit. If the high pressure lines from the condenser to the furnace or the evaporator coil in the top of the furnace are iced up, then shut the system down: Either turn off the breaker in the panel or pull the disconnect switch outside at the condenser. Track along the duct runs, listening for the sound. Central AC systems have a lot of sensors and switches, any of which might shut down the entire works. If you turn the thermostat to “Cool” and absolutely nothing happens, please see Central AC Not Working At All. Perhaps it’s blowing luke warm or hot air. Take the cover off the condenser and find out whether anything is blocking the air flow. Split-system central air conditioners, used with forced air furnaces, take hot air from the house and blow it through an evaporator coil located in the top of the furnace to cool the air. If the air handler makes a buzzing sound, it probably has a bad fan relay or, more likely, blower fan. If you would rather hire an air-conditioning pro to inspect and maintain your AC equipment, HomeAdvisor’s FREE service will help you find a qualified local AC professional. Check its circuit breaker, and any switch that controls it at the air handler or furnace cabinet. The capacitor (also called a run capacitor) is in the big compressor unit that sits outside (or sometimes on a flat roof). If the outdoor AC unit makes a buzzing sound, as though it wants to turn on but can’t, the run capacitor may be defective. Some repairs are easy, which means you can perform them yourself and return to cool, comfortable living. See How to Test and Replace an AC Run Capacitor, above. If it appears that a condensation drain tube is clogged with algae, remove it if possible (you may have to cut it and replace it later with a coupling). "Residential central air conditioning units are extremely reliable, which is why homeowners often forget to perform routine maintenance on them," says Francis Dietz, vice president for public affairs for the Air Conditioning, Heating and Refrigeration Institute, says in an email. But for your convenience, we’ll categorize the problems into ones YOU can solve and ones only a professional air conditioning repair technician can solve. Gary and Peg Hedstrom are self-taught repair masters with experience in carpentry, plumbing, appliance repair, and more. If it does not come on, … Over time, algae can block this pipe and, when it does, the AC won’t work. The cooled air circulates throughout the house via the heat ducts then returns to the furnace as warm air to be cooled again. Cooling Issue #1: Incorrect thermostat settings. Follow our quick links below and you can be troubleshooting your central vacuum system in minutes. If your air handler’s motor runs but the blower doesn’t move air, the belt that connects the two probably has broken. Check your circuit breaker box to ensure you do not have a tripped circuit, or your fuse box for a blown fuse. Reduced air flow, whether caused by dirty filters, a dirty coil, dirty squirrel cage blower, or a broken fan motor can cause the coil to freeze up, blocking air flow. Another sign that you may have damage to the air ducts is an increased electric bill. 1 Posts . Also shut off power to the indoor air handler or furnace and verify that the power is off. Other AC issues need professional intervention. Take off the plastic covers — there should be two — and put a couple drops of lightweight oil, such as 3-in-1, into each. A: It’s the last thing you want on a sweltering summer’s day—a central air conditioning system that’s not blowing cold air. 10 Reasons Your Air Conditioner Isn’t Working As summer approaches and flip flops become standard weekend attire, practically everyone around Atlanta is running their air conditioners. Shop for programmable thermostats now. Turn off the circuit breaker that serves the AC air handler. There are a few common culprits for distribution problems. Central Heating Heater blowing cold air; Heater will not light/stay lit; Furnace won’t shut off; Parts of the house aren’t warming up; Controls not working ; Fan not working; Mold buildup; Heater smells like burning; Short-cycling; Room Heaters Controls not working; Fan not working; Heater blowing cold air; The Goodman GCSS920804CN 80,000 BTU, 92% AFUE Single-Stage Gas Furnace … Use our troubleshooting guide to learn how to fix the problem yourself. The thermostat, which is typically mounted on a wall in a central location within the home, monitors and controls the temperature of the indoor air. If the air coming from your vents doesn't feel cool, it could just be your thermostat settings. There is one room that the air comes through the vent but it is very weak and not cooling the room.