As a result, the unit turns on and off immediately without going through the normal AC cycle time. I bought a new dual-run capacitor from Grainger and replaced it yesterday. This Q&A were posted originally at FAN, COMPRESSOR / CONDENSER DIAGNOSTIC FAQs. But it seems to me that that condition should not be for long. Unscrew and lift off the top panel. Typically, there's an on-off . Rapid fan on-off cycling certainly is likely to indicate an electrical or control problem worth investigating. . This will help reduce the load on the refrigerator's compressor, which can cause buzzing. Please advice on what to do, thank you. Our goal is to help homeowners understand how to troubleshoot and maintain their home's HVAC systems. Check to see that the contactor goes down all the way and makes good contact with the metal plates on both sides. see BLOWER FAN NO START NO STOP. My heat pump has a similar issue only in reverse. Over an extended period, that will cause the fan to stop working. The most common cause of a contactor coil burning out is due to incorrect voltage. The motor was hotter than you know where! There are several reasons the capacitor of your HVAC unit can fail. If you don't have a meter they aren't all that expensive. If your fridge isn't cooling, double check that . This is to check for continuity. Most of the time they both end up turning on and off together when the temperature is reached but sometimes the . Heres What to Do, AC Contactor Not Pulling In? Low Refrigerant. Ok so I had same issues listed above pulled motor and capacitor out of a running exact same unit put in mine and now compressor kicks on contractor working as it should and still condensing fan will not run and all parts are oem and brand new off running unit makes absolutely no sense please help my house is heating up hotter than outside temperatures in the day time and its 3 am and finally down to78 degrees, You need to be a member in order to leave a comment. Case #1: AC Compressor Not Working, but Indoor Fan is running. Guest horn4life A simple problem like this can also burn out a fan motor. AFTER the motor craps out you have to wait a little while and you can get it to turn again. When the fan motor overheats, the thermal overload switch will trip. If the condenser fan is runningyou will see the fan blade spinning at speed (typically at 1725 rpm) and you will feel air blowing out of the unit. The AC ran for about 1.5 hours and then shut down the fan due to overheating. Shouldn't the coil last longer than that? Cocoa/Merritt Island/Rockledge 321-631-6886 If your air handlers indicator light is flashing in some sort of pattern, then its telling you that something is not working correctly. There's A Rattling or Buzzing Noise Coming from the Condenser Unit When the Fan Is Turned On. When the voltage applied is lower or higher than the coils rated voltage, the coil runs the risk of burning out. Here's how to do it: Turn your refrigerator off at the wall or unplug it. This problem existed before and after the radiator was replaced. This fan blows building air across the evaporator coil (or cooling coil) to cool and dehumidify indoor building air. Then they replaced the fan motor. On 2020-03-02 by Anonymous Fan motor is bad. Our central A.C. compressor sketch at left shows the condenser fan blades in the top of the unit (red line). A faulty cooling fan relay can also negatively affect air conditioning (A/C) performance.The reason being, on most vehicles, is that the cooling fan doubles as a condenser fan.When the A/C is turned on, the fan moves air across the A/C condenser, thereby removing heat from the refrigerant, which changes from a vapor to a liquid state as it gives off heat it . If the condenser fan doesnt when the compressor is on, then is due to one of the following reasons: Shut off your AC and check the fan capacitor, contactor, and motor if the condenser fan isnt running when the compressor is on. Most likely a shorted winding. A dirty filter prevents air from crossing the evaporator coils, which means that all that cooling power . So how do you fix dirty contacts? Remove the screws holding the circuit board in place. might the Motor run, but then over-heat after a few minutes ? The line sets didn't even get cold or hot by even a degree difference. Dirty condenser coils. If the fan starts up and keeps spinning on its own, the capacitor is bad. Engine running hot. Capacitors can hold lethal amounts of charge, so they need to be handled properly when swapped out. Step 2 - Removed the quick disconnect connector. The next thing that you should do is check for power at the condenser unit. I think I'll try checking the ohm load on the motor. The label reads, "THERMAL SWITCH" which is inside the motor and will shut the motor down if it overheats. If it is a heat pump check for a heat pump breaker trip and reset it. Dirty or faulty gaskets. Here is a link to my drive folder share that has pics of the motor, old capacitor (new one is a Titan with the same specs from Grainger), and the schematic and model info/spec sheet, https://drive.google.com/open?id=1grZ8eUWjByFol_cpuomImiekyLdhT4JD. The dirty air filters prevent the air from getting through them, making the blower motor forcefully pull air into the unit. Take a look at the circuit breaker associated with . Check the Evaporator Fan Motor. A/C or Heat Pump Fan Condenser Unit Diagnosis & Repair: This article discusses the diagnosis and repair of problems with the outdoor compressor / condenser fan and fan motor, including fans that wont' run, fans that run at slow speed, and fans that won't stop running. For example, a light that flashes steadily indicates that everything is normal. The fan turns off outside and doesn't come back on until I switch the ac off and wait at least an hour or so n but it is still blowing air in the apartment. Fan is still intact. New to this site however have an issue similar to above. Thermostat Issues. The parts are priced at $245 to $330, while labor could be $55 to $200, depending on your make and model. Typically this is caused by an internal short in the motor windings. Step 4. Sorry taken so log to reply, I work a lot of hours. I use a multimeter to measure the resistance ac. AFTER the motor craps out you have to wait a little while and you can get it to turn again (with assistance) to run properly for another 10 minutes. Why Does My Outside Condenser Keep Running? Or should I just replace fan and see what happens? Heres What to Do. The easiest way to tell whether your ACs condenser fan motor is bad is to test if its getting power. Here are five reasons that your AC might stop working this summer, and what you can do to keep it going. Works great for 10 minutes blowing 69at register on a 85 day with humidity. This is usually the case for air conditioners with rotary dial thermostats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly. One of the most common reasons fans stop spinning is because of a dead capacitor. It starts by it self, and cools. Is it possible that this issue could be caused by the capacitor? Watch out: the wiring instructions and diagram for your specific air conditioner or heat pump compressor/condenser unit are model dependent. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. My AC condenser originally had a fan problem. FAN, COMPRESSOR / CONDENSER UNIT at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. The fan stops on the condenser. AC ran fin all Summer of 2018. This can leave the fan motor running. If your unit is blowing warm air from the supply vents in addition to running constantly, it may have frozen up. Fan is brand new. Still same, fan on condenser stops after a few. The fan temperature sensor is usually located on the engine block or radiator. Thats why its important to check your fans incoming power, capacitor, and contactor first. yes, I am not familiar with the proper terms. Listen and Look for a Faulty Defrost Timer. Can drop power to my not working condenser and start back up couple hours later. it depends. Test the windings of the motor of the evaporator fan with a multimeter. Turn off power and assure that the fan blade is secured to the fan motor shaft. Is there fluid leaking out of the capacitor? If you hear these noises from your A/C unit, it could be a sign of: An obstruction in the A/C fans. If the condenser coils are too dirty, the air conditioner's cooling power is limited so the system has to keep running in attempts to cool each room. 3. If the button doesnt click back into place then the motor is still too hot, or there is another failure somewhere inside the fan motor. I am semi handy-don't have an ohm meter (couldn't read it if I did) however some of these comments about the electrical are scary. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest. Make sure the door seals are properly sealed and tight. Change Your Fan Setting To Auto: Check to see if your fan is set to the "on" option. Faulty thermostat: The wiring may . The condenser fan should always be running if the compressor is on. Indeed you point out that when replacing a start/run capacitor itnisnimportant to use the proper one. DO NOT BUY A START/RUN CAPACITOR THAT EXCEEDS THE NUMBER OF MICRO-FARADS LISTED ON THE EXISTING CAPACITOR. I then went online and bought a new fan for $22.00 and installed it. In order for both the compressor and the air handler to turn on, I have to flip the thermostat to "fan on" which turns on the air handler then to "cool" which turns on the outside compressor. Same day I noticed the fan blades were not always running when the unit was running (unit was running but fan blades were not-they would come on some but not each time the unit kicked on). Immediately upon starting the car, the radiator fan begins to run full speed, even though the car is stone cold. When the motor craps out it doesn't make a noise or come to a grinding halt it just stops. Fan Only Switch. Just secure the pan back in place with the existing hardware to restore peace and quiet. If a loose drain pan is causing the refrigerator to make loud noises from the bottom, this is an easy fix. As an Amazon Associate, I earn from qualifying purchases. You will not receive a notification when a response to your question has been posted. The condenser fan has not stopped. Trane xb1000. A condenser fan that won't start when power is turned on, but whose blades will spin easily when power is off may have a worn fan motor shaft bearing. Anything else make it shut down like that? Step Ten: Putting it Back Together. I was unsure if perhaps having the fan unit so hot might have been part of the problem and causing the fan to shut down. The compressor is depending on the fan to move air across the condensing coil to convert high pressure, high temperature gas back to a liquid refrigerant. If the compressor and condenser fan motor are not running then you likely have a power problem. Turn off the breaker or thermostat . I really appreciate your help!!! not an electrical genius but pretty handy. Fan is brand new. Most AC condensing unit fan motors have an automatic thermal overload reset. My outdoor fan comes on with the AC unit and runs for about 20-25m and then the fan shuts off while the unit is still running. PDo let me know what your service repair technician says. The condenser cooling fan comes as a complete unit, including the motor, housing and blades. Any thoughts or suggestions would be most appreciated. A blower fan may run for a brief while after the compressor motor has stopped but if the outdoor fan never stops check for a problem with the control board wiring or circuit. Homeowners often report a heat pump fan not spinning. When the compressor cycles on, it also feeds a line to the condenser fan relay, running the fan. Warm air from getting through them, making the blower motor forcefully pull air into the unit ( red )! 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