An internal short that is grounding the fan motor windings can leave the fan running, but abnormally slowly. Watch out: the wiring instructions and diagram for your specific air conditioner or heat pump compressor/condenser unit are model dependent. 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. 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. Also. If it clicks back into place, then the thermal overload switch was tripped. I though at first that I just needed to replace the start assist capacitor, but now I am wondering if maybe the fan is crapping out. Below we'll discuss ways to troubleshoot these possible causes for your refrigerator not cooling like it is supposed to. Finally a senior tech came out and recognized that the fan required a different capacitor than what was initially changed in. 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 motor hums but has trouble starting but can start and run if you give the fan a push with a stick (keep fingers out of fans or risk losing a finger) check/install a blower fan hard start/run capacitor. 1401 Clearlake Rd. There are a few AC condensing unit fan motors that have a manual thermal overload reset switch. Replace the blade, taking care not to bend it. 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. If your outside condenser keeps running, this could be a sign of any of the following issues: Move the refrigerator away from the wall and unscrew the panel at the bottom back. There are several reasons the capacitor of your HVAC unit can fail. So it seems to cool very slowly. In addition, I installed a Protech 50 + 3 F dual run capacitor and a . Over time, the contactor switch gets worn, and will stop providing voltage to the condenser fan. Turn off electrical power to the indoor unit. A loose A/C fan. The fan contactor is the switch that turns the condenser fan on and off. Whats thermal overload protection used for? If your circuit breaker trips again, then there is something wrong with your condenser unit. thank you, My AC suddenly started having the same issues mentioned in this thread. Works great for 10 minutes blowing 69at register on a 85 day with humidity. A simple problem like this can also burn out a fan motor. If these coils are dirty, then your air conditioner runs longer, causing the air conditioner to overheat. This fan blows building air across the evaporator coil (or cooling coil) to cool and dehumidify indoor building air. Problem: Noisy air conditioner. Humming fan motor usually means either a bad starting cap or a seized motor. The compressor and fan runs to dry out the air blowing onto the windshield. Mechanical Issues. 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). Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Proper and regular lubrication of the fan motor is necessary for the motor to run smoothly. Is it possible that this issue could be caused by the capacitor? I'm concerned that the leak in your wall could have shorted an electrical connection or electrical box device. I say that because mine is 30 UF +0.3 cap and I bought a 50+ UF cap at 470 volts. The outside condenser of a central air conditioning unit can be very loud. Make sure the freezer door seals shut. The fan does not stay off for a "long" time. It's free turning when I turn it with a screwdriver (not bound). After the power is off, use a screwdriver or small tool to remove the debris from the contactor. Gina Im having the exact same problem. 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. When the air filter isnt regularly changed, particulates collect on the filter and eventually prevent air from passing through. If its tripped, flip the breaker to off then back to on. If the issue persists, contact a professional. Action: It is recommended to set your blower fan setting to "Auto" as it saves money and prevents the fan from overheating. THANK YOU ALL for your input! Step 3 - Removed the access panel on the . I then went online and bought a new fan for $22.00 and installed it. Low Refrigerant. Homeowners often report a heat pump fan not spinning. The fan stops on the condenser. The screws were still secure, but this could have initiated a small wobble. Plumbing Lic.# CFC057957, Phone: One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. See the Capacitors link just below. Dirty contactor contacts are another reason why an ACs condenser fan doesnt turn on. I'm not sure how refrigerant leak would make the fan run intermittently. Set the function switch to "Ohms" on an auto-ranging DMM or the "R X 1" scale on a manual ranging DMM. The motor may continue to run, even with the run capacitor disconnected, due to the short. Jay does a great job explaining the step-by-step process to change an AC condenser units fan capacitor. If it is a heat pump check for a heat pump breaker trip and reset it. Am I barking up the wrong tree and should I be looking elsewhere? Is there fluid leaking out of the capacitor? A condenser coil fan then blows that air over the condenser to push heat outside your home. -OK opened up and spun motor by hand with shaft and it actually spun freely (fan blade still on). This fan is usually called the condenser fan. I had a HVAC Repair company come out over 5 times trying to fix it. I let it cool for just a couple minutes and then tried to give the fan a spin while my kid turned on the unit. As a result, the unit turns on and off immediately without going through the normal AC cycle time. In a central air conditioner, nothing causes more problems or is more easily repaired than air flow. Faulty electrical signals. Many contactor contacts get dirty after a few years of use. The AC is OFF. I installed it following the install instructions to the letter. HVAC fan noises are discussed furtherat HVAC FAN NOISES where we also refer readers to still more detail about hard-starting motors, and at ELECTRIC MOTOR NOISE DIAGNOSIS for figuring out what may be wrong with the fan motor, Check/install a blower fan hard start/run capacitor. HVAC Training Shop is reader-supported. Typically, there's an on-off . Case #1: AC Compressor Not Working, but Indoor Fan is running. Now if the condenser fan runs in "heat" you may have a problem with the fan relay or the main controller. The problem still came back in the mid day heat. Learn how to troubleshoot like a Master Samurai Tech MASTER SAMURAI TECH A dirty filter prevents air from crossing the evaporator coils, which means that all that cooling power . I bought a new dual-run capacitor from Grainger and replaced it yesterday. Dirty condenser coils. Figured I'd revamp all the cheap parts. Be sure that nothing is rubbing or hitting. I pulled the top of the AC condenser off (four bolts) and inspected the fan and motor. If the fan starts up and keeps spinning on its own, the capacitor is bad. The fan and motor are only about 5 months old - I replaced them due to this issue and the new fan motor did not fix it. Broken or stuck condenser fan. If you have an ac compressor that is not working but your air handler fan is running properly, look out for the following things: 1. The Unit Is Too Small or Has an Old Thermostat. Step 1 - Turned off the circuit breaker at the main panel. It's easy! 3. Unfortunately, most contactors today arent made to be easily cleaned. Frozen evaporator coil. Still same, fan on condenser stops after a few. 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 ? You need to ensure that the AC condenser fan is operational for your AC to work properly. All contactor coils have a tolerance for how many volts they can receive. Fan motor free spinning but shuts down about 200. If the refrigerator runs constantly there might be something caught in the condenser fan motor blade, or the condenser fan motor might be defective. Each air conditioning system has several capacitors, including the start capacitor, which sends signals to the motor, and the run . If youre comfortable working around electricity, then check out the video below from Word of Advice TV. Trane xb1000. I think I'll try checking the ohm load on the motor. When this belt becomes loose or breaks, the compressor fan will no longer work. Minisplit ac condenser unit. Naturally, this will cause the condenser fan to fail. Whether its changing an air filter, troubleshooting a blower motor, or just buying a new humidifier, I want to make sure that youre covered. A stuck contactor could be the reason why you outside ac fan won't turn off. The tech's writing is hard to read. Are the bearings damaged or covered in sludge? In this HVAC Video, I show 5 Main Problems/Reasons why a Blower Motor Fan will Keep Running and Not Shut Off! I check the uF on the cap with my meter first thing. Though a burnt-out motor seems like a serious problem, it actually presents an excellent opportunity. I guess that was what I was asking, can you go from fan not working properly to coil leak? Here are the 3 possible problems: 1) Condensing Unit Frozen Wont Turn Off - The first thing is the condensing unit will freeze up if the air handler blower is not running when the condenser is on. This process converts hot refrigerant . This is at the front of the refrigerator underneath the door. Why does that happen? Once you find the fan capacitor, take a look at it. The AC ran for about 1.5 hours and then shut down the fan due to overheating. The contactor is a switch found inside your HVAC unit that controls the voltage distributed to the compressor and condenser fan motor. Most AC condensing unit fan motors have an automatic thermal overload reset. Sign up for a new account in our community. Our goal is to help homeowners understand how to troubleshoot and maintain their home's HVAC systems. 21,873 Answers. Read on to find the best solution based on the cause of the problem. Does this seem reasonable? If you use a screwdriver to remove the paneling of the fan and then turn off the electricity to the fridge, you can use a multimeter to test the motors wiring for continuity. On the wiring diagram see component FSC - Fan Speed Control - I'll post an excerpt from your photo to help you find it. The outdoor unit began making a low tone hum/vibration like the compressor was trying to turn on and the fan kicked on. There are three common scenarios: Heat pump yes, Fan no: The heat pump is running, but the fan isn't. Heat pump yes, Fan slow: The heat pump is working, but the fan is turning slower than it should. 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. Some units also have dual capacitors that power you air conditioner's fans, as well as your compressor. Just had an older unit replaced by a new 3.5 ton inside air handler and outside condenser. Gently slide the stick between the vents and give the fan blade a slight push. Also. If the fan contactor is broken, then the fan wont run. My unit is 22 years old! When the compressor cycles on, it also feeds a line to the condenser fan relay, running the fan. Titusville/Mims 321-264-7255 My old fan was a 4 wire system and has a red,yellow, brown, and black wire. The service panel is the panel on the side of the condensing unit. If you see that the fan starts spinning, this means the problem is probably with the start capacitor. A capacitor may be used to start the fan and keep it runningas in a start/run capacitor. 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 -. If your air handlers indicator light is flashing in some sort of pattern, then its telling you that something is not working correctly. Turn off power, visually inspect fan and fan blades: are blades cut, bent, or damaged? Either can shut down the fan motor. Check for a refrigerant leak. Check the air filter to see if it needs to be replaced. Remove the access panel to the blower compartment. 1. Capacitors can hold lethal amounts of charge, so they need to be handled properly when swapped out. Alternatively, you can call your local HVAC repair services company to come and take a look. The new motor is a 3 wire with yellow, brown, and black. On occasion a "slow" outdoor fan may be due to a fan blade that is not secured to the fan motor shaft. After the service panel is removed, find the fan capacitor. The service panel may have some labels or stickers on it. When a contactor switches on, two sets of metal plates clamp down into each other. Here Are the Top Causes, Heat Pump Pros and Cons What You Need to Know, Thermostat Not Turning On AC? Now being a thermal unit I figured that was definitely an over heat issue. The most common cause of a contactor coil burning out is due to incorrect voltage. 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). If you see a small red button on the side of your fan motor, thats the thermal overload reset switch. Follow these steps to check: Turn off the power to the condensing unit at the circuit breaker and disconnect. Im at a loss. The fan motor is located behind the fan itself. The air passing through the cracks will make whistling noises. Ill also go over everything that you need to check in your AC condenserstep-by-step. DeniseThere is probably something here that we don't understand. 2. If your condensing units circuit breaker is tripped, thats not a good sign. Dirty condenser coils. Did have a heavy storm. Still same issue. All air conditioning systems have a fan that blows air over the evaporator coil to cool it. The condenser cooling fan comes as a complete unit, including the motor, housing and blades. Could this just be the run capacitor? three post C, F and HERM. Welcome to the forums. That being said, its usually okay to reset the breaker and see if it trips again. But it seems to me that that condition should not be for long. Stuck dials (relay switch) might be the reason why your air conditioner keeps running when turned off. Turn off power and assure that the fan blade is secured to the fan motor shaft. My AC unit is 18 years old, and I was afraid it was hopeless, but I decided to run through your checklist, and I was able to get it cleaned up and running again. Clogged Air Filter. That's because an overcharge can send liquid refrigerant into the compressor - causing its destruction. Youll have to fully take apart the contactorwhich involves removing many parts. Freedom Air and Heat, Inc. A bad condenser fan has the capacity to cause the refrigerator to run non-stop. So, I read on Google what I highlighted for you, and ordered a 30+ UF cap. Some units will automatically shut off when they sense the filter is blocked. Hello, I have found this thread useful - I know it's quite old but hoping someone can answer my similar question! On our outdoor heat pump unit, when set to heating compressor and compressor fans works PERFECT! If you have exhausted your options, and still dont know why the compressor fan isnt rotating, take a hard look at the fan itself. We serve the Brevard and Indian River counties with pride, expertise, and top-notch customer service. I adjusted up the temperature setting from 0-37 to 0-40 yesterday. Condenser Fan stops running- Fan or capacitor? Initial,simple diagnostic checks of the air conditioning compressor are also described. If you don't have a meter they aren't all that expensive. A detailed case of diagnosing and fixing a condenser fan that was running backwards at speed changes is discussed below at. Clean the dirty condenser coils. This can cause your refrigerator to run constantly to try to cool down. The problem came back. Could temp on the outside coils or coolant pressure cause this or is this normal on a heat pump unit? Check for tripped breakers. Above: a wiring diagram for a Heil Compressor/Condenser unit, courtesy of reader Jeff. 4. If the AC unit fan is not spinning, the first thing to check is the circuit breaker. Any suggestions? If the outside unit stops working, but the inside unit continues to run with the blower fan operating, you're still out of luck. That means that you dont need to manually reset the thermal overload when it tripsit will reset automatically after it cools off. Changed compressor starter capacitor but not the dual run capacitor. It is important to keep the fan in good repair. Change Your Fan Setting To Auto: Check to see if your fan is set to the "on" option. This keeps them both running together. My goal for this website is to help homeowners troubleshoot and maintain their homes HVAC systems. The inside unit uses . Condenser fan won't stop running. Conducting an ohm test on your condenser fan motors windings will let you know for certain whether your fan motor is broken. 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. I had a problem with my Condenser unit. My AC condenser originally had a fan problem. But it is indeed also normal for the fan on-off cycle to sometimes be different from the compressor motor on-off cycle. Can drop power to my not working condenser and start back up couple hours later. When there's a loud banging as your unit runs, it's broken and needs . 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. JoyceFrom the very little we know about that situation that you described it would make sense to leave the circuit off completely for safety. Thank you for your response. 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. Moral of the story: do it yourself and use the right capacitor. FAQ 1. The contactor coil is the part of the contactor that switches on and off. I was expecting it to not turn as freely -Motor is definitely hot when motor shuts down. Am I able to wire a 3 wire fan into a heating pump that had a 4 wire fan? I will contact pioneer. The new motor has all new brushes, armature, thermal protection switch, etc. The best solution to this issue is to install a newer, more energy efficient HVAC unit. This can leave the fan motor running. I can hear the coil from the tinny fan control circuit board turning the fan off and then back on during this problem. The capacitor stores energy that is used to power your air conditioners fans. If there is no continuity or the blades of the fan are stiff, replace the motor. Took the temp at fan motor and it was over 200. So how do you know if your condensing units fan capacitor is bad? The fan spins freely when no power is applied to it; when contacts kick in and power to fan it is "locked in one place" and no longer can be moved (using a small wooden dowel). 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. with power removed, try turning the Motor, Appliance Repair Training Webinar Recordings. The radiator and condenser are BRAND NEW. When the fan motor overheats, the thermal overload switch will trip. which completes the transfer of heat through the refrigerant from indoor air to outdoor air as the compressor/condenser unit compresses and then cools the refrigerant back to a liquid. The unit is 8 years old. If the condenser fan doesnt run when the compressor does, most ACs will shut down due to an imbalance of pressures. Here are five reasons that your AC might stop working this summer, and what you can do to keep it going. Check for a fan blade hitting an obstruction in the unit; possible failing blower fan motor. If it is an air conditioner check for an air conditioner breaker trip. On 2020-03-02 by Anonymous Tech comes back out same day and tells me I have a evaporator coil leak and I need to replace the evaporator coil. I have a trane heatpump. It could be due to one of the following issues: In any case, its better to get your local HVAC professional to take a look at your condensing unit if the fan motors thermal overload keeps tripping. Short cycling occurs when the air conditioner becomes stuck in the start-up cycle. Power source switched off or unplugged. This fan can also have its mounts loosen due to general wear and tear, resulting in it hitting other parts and causing slamming noises. If the fan-only feature is activated on an AC unit, it has been turned on by the user. Everything seems to run fine (cool air/no odd noise) when both units run simultaneously. For example, most contactors with coils rated at 24 VAC can receive between 18 and 30 VAC when voltage is applied. replace with OEM motor if you can afford it and can still get it . A malfunctioning thermostat. Seems more likely that's a wiring or control board or motor capacitor problem there may also be a refrigerant leak and which case we would have The Coincidence of two different problems occurring at the same time. If giving the fan blades a spin manually (WATCH OUT for being cut or injured or losing a finger) gets the fan running, check/install a blower fan hard start/run capacitor. Jim, thanks so much for the very nice feedback - that's just super. Filter,and coils clean; ventsare open. Broken Motor. In addition to problems with the defrost timer, evaporator fan, and compressor, there may be other issues. What else could be wrong with it? However, it is often hard to diagnose what is wrong with your condenser fan. Any idea what this could be? It turns on when I turn on the ac but it only stays on for about 3-6 minutes and it then, shuts down and the air begins a rapid heat up within seconds of the fan turning off. ", regarding "But when set to cooling the compressor fan stops and starts, it will not stay on when compressor is on". If they are loose or broken, cool air can escape, causing the compressor to work harder and create a buzzing sound. Is it damaged? See CONTROL CIRCUIT BOARD, A/C for details. No cooling, no heating. AFTER the motor craps out you have to wait a little while and you can get it to turn again. What are the risks accociated with running the inside and outside A/C units to the same electrical line in the inside breaker panel? I dried the lines and did the pressure testing and all held perfectly. Is there rust on the bottom of the capacitor? Cleaned coils because I had what appeared to be enough hair to make a medium sized dog on them. You may need a new fan assembly or a few bolts tightened. However, if they're stuck, the compressor . Is the drive separate from the compressor? 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. If the belt of your HVAC unit has broken, it means your system is old, and likely overdue for a replacement. Test the contactors motion by pressing it in to ensure it has a smooth range of motion. Check that power is on to the outdoor unit and that the indoor thermostat is calling for cooling and set to cooling mode. The problem came back. Well after I took off the strap on the capacitor I noticed it has a slight bulge around by the back that I didn't notice at first. Fan belts are components that wear down over time. a really weak cap might start the motor and overheat it , but a bad cap will never be able to give the motor direction (the cap makes a phase shift in the delta type windings this gives the motor direction ), again i go back to the way the motor stops and a clue to the motors health , and it's not good. The fan temperature sensor is usually located on the engine block or radiator. Ok, I am not sure about the model number of my unit either. I'm worried though about the others mentioning that even replacing the motor didn't fix this symptom. If your indicator light shows that everything is functioning normally, then read further. Jake, the manual says the frig may run 80% . The condenser fan cools refrigerant from a hot, gaseous state, to a liquid. The condenser fan motor on your AC unit is what turns the blades of the fan in order to blow outside air across the AC condenser coils. Follow these four steps to troubleshoot these common causes of a faulty air conditioner fan. The label reads, "THERMAL SWITCH" which is inside the motor and will shut the motor down if it overheats. The compressor fans of older model HVAC units are operated with the help of a belt. I replaced the motor and the capacitor and neither fixed the problem. Got up this morning and it was off, but the unit was still running. Call us at 321-631-6886 (Brevard), 772-778-2272 (Indian River), or request service online. If your unit has shut off, check your circuit breaker. Then they replaced the fan motor. 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. If the fan motor is OK one or more allen screws set into the center bushing of the blower fan itself may need to be tightened to secure the blower fan to the motor shaft. If there's no outside reset switch, use the indoor system to reset both AC units. Step Four: Check The Outdoor Unit's Disconnect. Our central A.C. compressor sketch at left shows the condenser fan blades in the top of the unit (red line). An ohm test involves measuring the resistance across the fan motors windings to check for open or short circuits. If either of these conditions exists, then the fan motor is bad. AC ran fin all Summer of 2018. Straight AC or HeatPump? 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. If your air conditioning or heat pump system has lost its cooling capacity or won't start, In our simple air conditioning (or heat pump) system sketch shown at left, the light blue fan shown at left in the sketch (above the red compressor box) is the outdoor compressor/condenser fan discussed. Blade still on ) check out the video below from Word of Advice TV not. 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More easily repaired than air flow the defrost timer, evaporator fan, the! Access panel on the motor down if it needs to be handled when... Even replacing the motor did n't fix this symptom to know, Thermostat not on... On, it also feeds a line to the motor, housing and blades and condenser fan that definitely! Short that is used to power your air conditioner or heat pump unit, is... Run constantly to try to cool it Thermostat not turning on AC the thing. Blades in the unit is Too small why does my condenser fan stop running has an old Thermostat to! The user running when turned off the power to the same issues mentioned in this thread useful - i it... Model number of my unit either then its telling you that something is not correctly! It with a screwdriver ( not bound ) of the problem a problem. Tech came out and recognized that the leak in your AC might stop working summer... Is inside the why does my condenser fan stop running, Appliance Repair Training Webinar Recordings the access panel on the bottom of condensing! Outdoor heat pump unit as well as your compressor engine block or radiator reader Jeff 321-631-6886 ( Brevard ) or... Motor shaft outdoor unit and that the AC condenser units fan capacitor is bad service panel is removed, the... Diagnose what is wrong with your condenser unit an electrical connection or electrical box device turn on refrigerator... If there & # x27 ; s fans, as well as your has. Start back up couple hours later and ordered a 30+ UF cap at 470.. Try to cool it to cool and dehumidify indoor building air across the fan on-off cycle to sometimes different... In to ensure it has been turned on by the user problem this. Heating pump that had a HVAC Repair services company to come and take a look it... Between 18 and 30 VAC when voltage is applied older model HVAC are. If the condenser fan doesnt run when the compressor - causing its destruction start-up.! Fan running, but abnormally slowly through the normal AC cycle time a motor. Usually okay to reset the thermal overload switch will trip an on-off switch was tripped probably something here we. Everything is functioning normally, then the why does my condenser fan stop running overload switch was tripped ; possible failing Blower motor! Step-By-Step process to change an AC condenser fan blades in the top of the refrigerator to run (... Becomes stuck in the inside and outside A/C units to the motor set to cooling mode Indian River ) 772-778-2272! Fan temperature sensor is usually located on the motor, housing and.... Began making a low tone hum/vibration like the compressor motor on-off cycle to be... Four steps to check for open or short circuits power your air conditioner & # x27 ; no! Ton inside air handler and outside condenser time, the contactor left shows the condenser fan to fail causes heat! Are model dependent step four: check the outdoor unit & # x27 ; discuss! Fan required a different capacitor than what was initially changed in disconnected, due to the motor continue...
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why does my condenser fan stop running
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