When the voltage applied is lower or higher than the coils rated voltage, the coil runs the risk of burning out. Typically this is caused by an internal short in the motor windings. Well in your case I more than likely would call a HVAC person to take care of it . evaluation of air conditioner compressor noises, hard starting, lost cooling capacity, and detection of a burned out compressor or A/C compressors at or near end of their life. If the compressor/condenser unit has power and the compressor motor appears to be able to start and run normally but the outdoor compressor/condenser fan itself won't turn on, the fan motor may be overheated or damaged -. Dirt, dust, and debris can accumulate on the condenser coil , limiting the coil's ability to release heat from the refrigerant. We ought to be able to follow the old 4-wire fan wiring, Also some basic condenser unit wiring connections and wire color codes are summarized. Either can shut down the fan motor. Giving them a good clean should solve the problem. Perhaps the most unexpected reason the compressor fan isnt working is due to the air filter. If the contactors coil is burned out, then the contactor wont turn on your condenser fan. See the Capacitors link just below. Alternatively, you can call your local HVAC repair services company to come and take a look. Fan Only Switch. Filter,and coils clean; ventsare open. Not enough space clearance. If the refrigerator runs constantly there might be something caught in the condenser fan motor blade, or the condenser fan motor might be defective. A slow condenser fan (or air handler unit fan) could be caused by a bad start-run capacitor. Now if the condenser fan runs in "heat" you may have a problem with the fan relay or the main controller. Sometimes there is a one-off fluke in the system that causes a circuit breaker to trip when everything else is otherwise normal. (May 30, 2020) Jeff said:I have a heat pump unit where the condenser fan motor has burned up. Simply put, the dials usually meet to complete the circuit and turn on the compressor if the room temperatures are high. If the condenser fan in your unit gets faulty, it can result in a blown fuse as the system has to work harder to keep your space cool. The most common cause of a contactor coil burning out is due to incorrect voltage. Set the function switch to "Ohms" on an auto-ranging DMM or the "R X 1" scale on a manual ranging DMM. A contactor is a moving part that pulls in when it switches on. The four screws of the fan motor to support frame were still tight, as were the four bigger screws attaching the framing to chassis (minus spacers). It comes about every 10 minutes or so. Replace a faulty evaporator fan motor. Secure the Drain Pan. After the power is off, use a screwdriver or small tool to remove the debris from the contactor. 5. Be sure that nothing is rubbing or hitting. Test and Replace the Fan Motor. Plug electronics into a power strip and turn it off when not in use. A loose A/C fan. Is the fan blade assembly secured to the fan motor shaft? Why does that happen? Turn off power to your AC unit and verify that power is off using a multimeter or voltage detector. The only culprit I could pin this to was that the framing the motor & fan are supported by, was that of the four screws that secure this assy to the chassis, 3 of 4 had missing spacers. My central heat/air conditioner is Trane (XL80 for the furnace and XE 1200 for the condenser/compressor) and the part that I will troubleshoot is the condenser unit that is located outside. If you see that the fan starts spinning, this means the problem is probably with the start capacitor. The Unit Is Too Small or Has an Old Thermostat. ALSO- if I need to replace the capacitor what is the proper way to discharge it? The next task is figuring out why the thermal overload tripped in the first place. Stuck dials (relay switch) might be the reason why your air conditioner keeps running when turned off. Check to see if the fan starts spinning. That means that you dont need to manually reset the thermal overload when it tripsit will reset automatically after it cools off. A detailed case of diagnosing and fixing a condenser fan that was running backwards at speed changes is discussed below at. I guess that was what I was asking, can you go from fan not working properly to coil leak? Thought that AC wasn't cooling 100%, and low and behold went outside and condenser fan was not turning and fan was hot as well as entire unit. The dark blue fan shown at right in the sketch is the indoor air handler or blower compartment or cooling coil fan found inside the building. During that process, a short arc of electricity forms between the metal plates. If they are loose or broken, cool air can escape, causing the compressor to work harder and create a buzzing sound. with power removed, try turning the Motor, Appliance Repair Training Webinar Recordings. The contactor should spring back up into place when you remove pressure from it. The capacitor stores energy that is used to power your air conditioners fans. If you hear these noises from your A/C unit, it could be a sign of: An obstruction in the A/C fans. Mechanical Issues. If your unit has shut off, check your circuit breaker. Had to turn the unit off for about an hour. If the fan-only feature is activated on an AC unit, it has been turned on by the user. October 4, 2012 in DIY Appliance Repair Help. If i try and turn the AC back on after this happens, sometimes the fan will start with the unit and other times it won't. There are several reasons the capacitor of your HVAC unit can fail. Freedom Air and Heat, Inc. The fan continues to run at its maxiumum speed, regardless of the engine temperature. Fan is brand new. Bob,Thank you for the helpful diagnostic question about your Pioneer brand Mini Split AC unit. Also, noticed the old fan wire actually has a quick connect coupler for all four wires to connect into a circuit board. See if you can find the wiring diagram for your condenser unit - often on a sticker in the unit, or always in the IO manual for the unit. Thermostat Issues. This will cut power to the condenser fan. Proper and regular lubrication of the fan motor is necessary for the motor to run smoothly. The tech then recognized that the fan blades where on backwards (his fault). My guess is no low speed, but we need to know all circumstances in which that speed is used to assure dropping it is ok. Bob:I would leave the system OFF entirely until at the very least you're sure that you put in the proper charge of refrigerant. But when set to cooling the compressor fan stops and starts, it will not stay on when compressor is on. Tech comes back out same day and tells me I have a evaporator coil leak and I need to replace the evaporator coil. ugh, I mean I did those 2 tasks separately hehe. Theres usually a reason that it trippeda malfunction. The fan bushing dislodged from the motor shaft and it stopped spining (of course it would). The condenser fan should always be running if the compressor is on. If your condenser fan isnt working, let the expert technicians at Freedom Air take care of it. Unfortunately, most contactors today arent made to be easily cleaned. 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 . You may detect this by noticing that you can wobble the fan motor shaft (when power is OFF) or you may notice that you can pull the shaft in and out of the motor (loose end-play). The problem still came back in the mid day heat. Other compressor units such as those used. Finally a senior tech came out and recognized that the fan required a different capacitor than what was initially changed in. Turn the air conditioner completely off, and call in a professional right away to diagnose the cause and prevent further damage to the system. Like with any mechanism, these fans can wear out, break, or become damaged. Shut off your AC and check the fan capacitor, contactor, and motor if the condenser fan isn't running when the compressor is on. I installed that cap and the motor shut down in five minutes. AFTER the motor craps out you have to wait a little while and you can get it to turn again. 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. Broken Motor. Learn how to troubleshoot like a Master Samurai Tech MASTER SAMURAI TECH Nothing. Confirm that power is off by using a voltage detector. Poor air conditioning performance. Or should I just replace fan and see what happens? Possible low voltage at the equipment; possible condenser unit control board circuit failure. My new cap and motor arrive Wednesday, so I'll change them both out. If your indicator light shows that everything is functioning normally, then read further. The flashing codes are different for every HVAC unit, so youll need to consult your instruction manual to decipher the code. A refrigerator's strong fan noise is typically created by the condenser fan or compressor. - outside fan is not running, my outside fan is not running even though the heat pump is on, On 2020-01-26 - by (mod) - heat pump fan out side is not working. The radiator and condenser are BRAND NEW. Jim, thanks so much for the very nice feedback - that's just super. This will help reduce the load on the refrigerator's compressor, which can cause buzzing. 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. Is it swollen at the top? I've included pictures of the schematic as you suggested.Really hoping this new fan is able to be used. The fan will NOT start on it's own but you can see it "tries" to move in the right direction. To fix a contactor with debris stuck between it, youll need to remove the debris. If these coils are dirty, then your air conditioner runs longer, causing the air conditioner to overheat. Most capacitors are cylindrically-shaped, like a large battery. with power removed, try turning the Motor shaft by hand..using your fingers Can you give it a twist, and it will continue for a few turns ? 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. Air Conditioner Making a Humming Noise. Sorry taken so log to reply, I work a lot of hours. Contact us if you have suggestions. But if your air conditioner is running loudly, it could be a sign of a problem. It is important to keep the fan in good repair. An HVAC technician will need to inspect the outdoor fan assembly and make sure it is tightly secured and working properly. Think this could be the fan motor itself? The best solution to this issue is to install a newer, more energy efficient HVAC unit. I had a problem with my Condenser unit. 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. Thanks in advance for your input- sourcing parts now that's a dual Capacitor .. two sections .. one for Fan, one for Compressor, OR just a replacement for the (smaller section) Fan Capacitor .. about $ 5, If replacing the Fan Motor, install a new Capacitor (matched to the rating needed for the new Motor), I'm not a HVAC master, but if the run Capacitor was bad (or nearly 0 MFD). So is there an easy way to test to see if the fan motor needs replacement? This sensor takes readings from the refrigerator (and freezer if you have one . An internal short that is grounding the fan motor windings can leave the fan running, but abnormally slowly. The new motor has all new brushes, armature, thermal protection switch, etc. if the cap is bad the motor will not start on it's own at all , if the cap is bad you can give the motor a spin backwards , turn on power , motor will run backwards , it will be weak but will still ta, The capacitor is fine the motor is bad 100 %, the motor may spin by hand no problem ,even if the motor is bad your replacement motor most likely will be a universal motor that will use it's own cap , that will be a 5 mfd to a 7.5 mfd . Tech came out and replaced the fan motor. Thank you for the helpful comment. Please advice on what to do, thank you. if you go with a oem motor it will connect to the cap already there, you do not need to discharge this cap , it's mfd's are to low to be of any danger , but be aware if you have a black plastic cap in there too (compressor start cap) you will need to discharge that one before you stick your hand in there, regus: newer caps do not get weak , its a good or bad with them , really old caps can dry out and get weak but this is not the case in this case . might the Motor run, but then over-heat after a few minutes ? The outside condenser of a central air conditioning unit can be very loud. There is one other test that you can do to confirm whether your ACs condenser fan motor is bad. Or compressor contactor coil burning out is due to incorrect voltage it been... Is there an easy way to test to see if the compressor if fan-only! Fault ) do to confirm whether your ACs condenser fan that was running backwards at speed changes is discussed at... 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