He has degrees in science and humanities and years of teaching experience. The thermostat monitors the temperature of the air. The thermostat monitors the temperature of the air. At this point, you need to call a licensed service professional. If the condenser coils are dirty, they won’t be able to dissipate the heat as effectively. Chris Deziel is a contractor, builder and general fix-it pro who has been active in the construction trades for 40 years. However, this is not usually the case. To determine if the thermostat is defective, set the air conditioner to cooling and then use a multimeter to test the thermostat for continuity. This may take a day or more. We've got millions of parts, hundreds of brands, and thousands of step-by-step videos— everything you need to find it, fix it and finish the job right. In the first leg of its journey, the refrigerant gets compressed in the condenser coils. When the air temperature rises above a set point, the thermostat activates a switch to provide power to the fan and compressor. After correcting this setting, turn the thermostat to its maximum cold position. If you want the air conditioner to blow cold air, make sure the controls are properly set. Room air conditioners are not designed to cool … If no air is coming from your air conditioner, check the circuit breaker, which may have tripped. If it still doesn't blow cold air, the refrigerant charge may be low or the condenser may have a worn seal. A simple procedure can help determine which of these conditions is responsible. A DIYer by nature, Deziel regularly shares tips and tricks for a better home and garden at Hunker.com. Close your windows when the air conditioning is running. Window AC not cooling: Troubleshooting. One of the most common reasons for a window air conditioner to fail to deliver cold air is incorrect mode selection. Air conditioner cycles on and off too much or does not cool room in cooling mode The air conditioner is not properly sized for your room. As debris builds up on the coils, the air conditioner will become less efficient, causing the air conditioner to work harder to cool down. The main control board regulates the voltage to the compressor and the fan motor. However, when the unit is properly set to "Cool" but it doesn't blow cool air, possible problems include low refrigerant, dirty air filters, and coil freeze-over. If the coils are significantly dirty, the air conditioner will not be able to maintain the proper temperature, and the compressor will run continuously in an attempt to cool the room. (Note: Some thermostats may also control a heater and, as a result, will have three terminals. Main control boards are often misdiagnosed; make sure to check more commonly defective parts first before replacing the main control board. If you don't feel cold air even when the condenser is working, the coils may have frozen over, the filter may be dirty or the refrigerant charge may be low. Check the settings on the front of the unit. This should make the condenser start, and you should start to feel cold air. Check the condenser coils to determine if they are dirty. Join Repair Clinic's VIP email list for 10% off, plus other discounts and tips! Hunker may earn compensation through affiliate links in this story. If the condenser coils are dirty, clean them. If it's set to "On," it will blow air even if when the condenser isn't working, but in the "Auto" position, it will only come on when the condenser is working. It's against the law for an unlicensed person to service the refrigeration system in an air conditioner. If the thermostat is defective, the thermostat may not cool properly. An avid craftsman and musician, Deziel began writing on home improvement topics in 2010. Turn the air conditioner back on after cleaning the filter and deicing the coils. However, when the unit is properly set to "Cool" but it doesn't blow cool air, possible problems include low refrigerant, dirty air filters, and coil freeze-over. Start doing it yourself with the confidence that comes with 100+ years of experience. Window AC not cooling: Troubleshooting. There are several possible problems when a window AC’s not cooling. While you're at it, go outside and clean the exhaust grid with a garden hose. Refer to your air conditioner’s wiring diagram for more information.). If the main control board fails, some components will not function properly or will not work at all. Midway along its path, it passes through a tiny aperture and enters the evaporative coils, where it turns into a gas. Here are some things you can try to isolate the exact problem when you window AC’s not cooling. If you don't hear the rumble or feel any vibrations, something is wrong, but the problem may be simple to fix. This greatly reduces the cooling capacity of the air conditioner. Haier portable air conditioners can be easily moved without switching around your furniture. When you turn on your window air conditioner and select "Cool," the condenser switches on and circulates refrigerant through a series of coils. Already ordered? The compressor might be defective. The condenser coils dissipate the heat as the refrigerant passes through the coils. Give the plug a push to make sure it's seated in the socket. Shipping all 7 days! It's also possible the condenser motor isn't working or isn't getting power. The transition from a liquid to a gas sucks heat out of the air, and as a result, the evaporative coils turn cold. If the thermostat is defective, the thermostat may not cool properly. Solution 1: Temperature Control Board. If it is not possible to clean the air filter, replace it. The control board regulates the voltage to the compressor and the fan motor. Before replacing the compressor, be sure to check more commonly defective components—particularly the overload protector and the compressor capacitor. The fan selector should be set to "Auto." When the air temperature rises above a set point, the thermostat activates a switch to provide power to the fan and compressor. The condenser makes a rumbling sound and typically causes the unit to vibrate. If you can feel air blowing from your air conditioner, it means the fan is working, but the condenser may not be. Email. If the compressor is defective, it should only be replaced by a licensed technician. Here are some things you can try to isolate the exact problem when you window AC’s not cooling. To determine if the thermostat is defective, set the air conditioner to cooling and then use a multimeter to test the thermostat for continuity. Look inside the the housing with a flashlight to inspect the coils before you replace the air filter. It may be dirty, and if so, clean it with soap and water or buy a new one. By creating an account you agree to the Hunker, When you turn on your window air conditioner. Control boards are often misdiagnosed; make sure to check more commonly defective parts first before replacing the control board. Enter model number to search for the required part specific to your product, Browse our parts categories to select from a variety of parts for your product. Blinds, curtains, furniture and chairs can all block air flow out of the air conditioner and negatively impact the appliance's cooling effect. If the air filter is clogged, air cannot flow properly through the air conditioner. In a properly working air conditioner, a fan will draw air over the evaporator coils, where it is cooled, and … If LEDs on the front panel are illuminated, indicating the unit has power, the problem could be a stuck fan blade, or it could be a problem with the control panel. One of the most common reasons for a window air conditioner to fail to deliver cold air is incorrect mode selection. Paradoxically, a coating of ice prevents the unit from blowing cool air by forming a barrier over the evaporative coils. Of experience remove debris from the air filter, try cleaning the filter deicing. This point, the refrigerant passes through the air conditioner off until the melts. Fail to deliver cold air is coming from your air conditioner be dirty, clean them with a flashlight inspect... Be dirty, and you should start to feel cold air unit to vibrate and.. Gets compressed in the socket the first leg of its journey, the refrigerant through! 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