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. Adding a certificate takes only a few moments. To determine if the thermostat is shorted out, use a multimeter to test it for continuity. This component "tells" the air conditioning fan to shut off once the thermostat reaches a reading equal to the temperature setting. However, this is almost never the case. If your system is running all the time then the control board could be defective. If an air compressor runs, pumps air into the air tank, the tank pressure reaches the... PRV doesn’t let go. ), Air Conditioner Temperature Control Thermostat. 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. Depending on the information that you enter, you may be able to add your tax exemption certificate immediately and Mine has the same issue in addition to a few others (won't turn off compressor after pressing the button to turn it off, won't blow to the floor unless I turn the vent selector dial all the way to defrost first, won't adjust temperature unless I turn … En español Live Chat online. When the air temperature rises above a set point, the thermostat activates a switch to provide power to the fan and compressor. Your thermostat is your way of communicating with your air conditioner. If you are certain that all of the other components are working properly, replace the temperature control board. Power Cord. Output relays on the board will control the fan and compressor circuits, turning them on and off to maintain the set temperature. Check the contactor relay switch. If your air conditioner won’t shut off, you may have a defective temperature sensor. We can offer you custom troubleshooting help if you search with your model number. If the compressor or the circulating fan and compressor remain on even after the temperature has been reached, you may have a defective relay on the board or the processor circuitry on the board may be at fault. (Note: Some thermostats may also control a heater and, as a result, will … If you are certain that all of the other components are working properly, replace the main control board. The condenser coils dissipate the heat as the refrigerant passes through the coils. A sensor device called a thermistor is used to monitor the room air temperature and this information is sent to 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. Only the fan blows, but the vehicle’s interior won’t be cold due to the non-circulation of the cooling fluid. Hold times are long. This can overheat your compressor, causing unit wide damage. The temperature control board provides voltage to the fan motor and compressor. The relay board provides voltage to many of the air conditioner components, including the fan motor and compressor. If the thermostat has continuity all the time, this indicates that it is shorted out and should be replaced. The temperature control thermostat provides voltage to the fan motor and compressor. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. Inspect the control board for any signs of a loose connection to the sensor as well. We see you're shipping to . Common solutions for: My AC Won't Turn Off. Verification is completed within 3 business days. Here are the most common reasons your Carrier AC compressor won't turn off - and the parts & instructions to fix the problem yourself. If the pulley won't turn with the ignition off, then the a/c pump and clutch pulley have both frozen and you'll have to leave the belt off but it should be OK to drive a short distance. As the temperature on the sensor drops, a pressure change occurs at the control and the switch contacts will open and shut off the compressor. You should hear the AC compressor working or attempting to work. Air conditioner is turned off but fan keeps running If your blower fan is continuing to run after the system has already turned off and you made sure your thermostat isn’t set to the ‘ on ’ position, then you’ll want to try and pinpoint the issue. Leave your car's hood open and turn on the engine. So, if … Testing of the sensor will require the technical specifications of the thermistor for your model and a multi-meter. To begin, you need to log into or create an account with Fix.com. (Note: Some thermostats may also control a heater and, as a result, will have three terminals. Start Relays – As with the capacitor, the HVAC technician may try replacing the start relay, which is the only surefire way to determine whether it’s working right or not. We make fixing things easier! Join Repair Clinic's VIP email list for 10% off, plus other discounts and tips! If you have items in your cart, they will be saved for your return. Turn on your AC even if it isn't working, and go to the front of your car to listen to the compressor. The thermistor is located near the evaporator and monitors the air temperature in the room. A sensor device called a thermistor is mounted near the front of the evaporator and is used to monitor the room air temperature. To turn the blower fan off, simply set your thermostat to the ‘ auto ’ option. Dirty Air Filter. Refer to your air conditioner’s wiring diagram for more information. I am having problems with my AC compressor not coming on. If there is a problem with the relay board, it might provide continuous voltage to the compressor. 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