Question: I replaced my capacitor, but the fan still does not spin even if I do it manually. Is there a way to find it from the model/size? After a time (less than a minute) the outdoor unit fan stops. Would this be a capacitor problem if the fan is running? I had a repairman out here about 1 week ago and they checked everything. All bad. Fans are working fine. There's a pull for too many amps coming from somewhere. Sure enough capacitor was the problem. I didn't test the capacitor itself, but found one at the local supply store and replaced it. Based on the given information that's about all I can offer. Would the capacitor cause this problem? Kaelynn - While I can't say for sure what's happening you may want to consider the contactor as a suspect. I would try again or find out who in your area is selling Carrier to the installers and they should be able to tell you. There's an example of a reliable and very inexpensive circuit alert device in section three of this article. Also, he said not to adjust the temp, to leave it at 72*. AC Fan Motor Maintenance. The compressor and the indoor blower etc. Question: I will diagnose the starter capacitor later today, but I suspect that my compressor is the issue. I'm not sure what he did, but it's been running nonstop ever since. Different colored wires go to different terminals. You can always use a lower amperage fuse but never bigger. It should be simple to unscrew the metal band holding it in. Hi Dan, my AC quit working. My question is , the technician that came initially said the compressor was OK on Monday and by Saturday was bad, was the installation of the capacitor the possible cause of the compressor being blown on a 6 year old unit? My machine is 15 years old, but it was running well. Fan motor problem? What could be causing this problem? There is never a need to add refrigerant without one of those reasons. Once it is discharged, use a capacitor tester to check the microfarad reading. Then everything is going fine then all at once the compressor kicks off and then rite back on. Some units do. Hi. Touching two of the terminals at the same time with your hand will discharge this power and make for a shocking experience. They typically provide several years of service, but you'll need to replace them at least once if you keep the same air conditioner for more than ten years. The heat worked fine for a day, but overnight it seemed to stop and now it's back to humming with no fan spinning. Keeping up on your A/C maintenance can help prevent these types of breakdowns. Check to see if the contractor is pulling in. I pushed it with a stick and the fan turns, but won’t stay on. Outside Fan on comfortmaker a/c is laboring to start and runs noisily. Do you have any ideas? x 25 ft. I hope this helps a bit and thank you for reading. I've checked the capacitor and (unfortunately), I'm not seeing the soda can bubble. Answer: Well, capacitors can go more frequently than other parts, and sometimes it's because there is an underlying issue, but it would likely show more than every three years if there were. The issue is, why does it keep blowing. Any suggestion? The capacitor is tested and fine. I fixed that by installing a new whip, or AC weatherproof wires. Don’t know where clicking noise is coming from fan or compressor when ever I turn the ac unit on. Question: I have a 1980s magic chef, its running and barely blowing cool air. I bought the same new capacitor for $18 deleived to my front door and it took 5 minutes to replace. keep running. A capacitor is a storage device that stores electrical charge and is ready to release it almost instantaneously when needed. Question: Hi Dan! So I come home from vacation last night. The one you just bought should be under warranty however so perhaps you try once more and see if you just got a bad part right out of the box. Before you remove the wires from the old capacitor, be sure to make a diagram or label showing what wire goes where. I feel air blowing but I do not think the warm air is being circulate out of the house. Answer: Improper voltage from the disconnect/breaker, high temperatures, and bad motors/compressors are all suspects in repeated capacitor failure. The motor could just be bad. Just know that you have to match the micro-farad number exactly. Question: My compressor is running, but my fan will not turn on. my central air gives off a vibrating noise about every 15 minutes otherwise AC works fine. I couldn't offer more without testing the circuit. I can hear a faint buzzing when disconnect is pulled. If they are not written down, write down the make and model of your air conditioning unit, and use that information at the store or online to find the correct replacement part. Should I buy a new unit? Also, the fan sounded louder than usual. Lastly, the contractor could be "chattering" meaning it's not making a good connection. I’m in Texas where it’s record heat right now. You and your stick just took over the job of the start capacitor. Not necessary to cool when in heat mode. If you suspect fuses are the problem, it can be an even easier fix. I went to bed, did not notice extra heat, or anything at all other than teenager has bonus room and attic is accessed in that room and he left light on while gone, so I went up to turn it off (and to make sure no one was in my attic), I noticed immediately that it was cooler inside the attic in GA heat than in house and I know that is an unusual occurrence, normally that rooms AC runs continuously depsite temp inside room because the thermostat is on the attic wall and is always hot (separate unit for bonus room). Question: After my A/C froze up, I was told to change the thermostat. Thanks. 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Answer: There are a lot of possibilities that would require you running some electrical tests. AllTek 45 MFD Round Run Capacitor 370-440 VAC Volts 45 uf Motor Run Capacitor for Condenser Str… For those with window units, when winter time comes around, you might want to remove the unit and store it somewhere to protect it from frost, dirt, and debris. If the capacitance is low it is just a matter of time. The compressor outside probably stopped working for a few day untill I noticed yesterday because there is no cold air blowing from the venst inside the house. Isn't $350 every three years a bit much for a replacement? (It stops). Answer: If they are willing to deduct the cost of replacing the compressor from the cost of replacing it and your budget allows it, then I would say yes. Question: My daughter's unit started blowing warm air and it was freezing up outside. He said he had to bypass something to make it run nonstop. 4.8 out of 5 stars 13. My ac works fine (set at 76, stays at 76) until 2-4 pm until 11-1 am when it gets all the way up to 85! By Monday it was determined that the AC blew out the power and also that now the compressor was also bad , I was now informed I needed a new AC unit. Remove the service panel on the A/C unit itself. Typically, it is shaped like a can … Know the micro-farads (μF) and the voltage rating, or the make and model of A/C. - Learn how to change a run capacitor in your air conditioner unit. Love this site. When a capacitor dies completely, the air conditioner motor will try to come on but may make a humming sound rather than fully starting up. If that is the case, it sounds like the compressor is perhaps going bad and while that may not be what you want to hear, those units aren't typically worth the repair vs. replacing the unit. fazedbygrace - First, I always recommend making sure the filters are clean. After you have turned off the power at the disconnect: One tell-tale sign that a capacitor is shot is its shape. I have a Lenox AC (4 yrs old) and it now has quit cooling. Why is this? Perhaps a capacitor, fuses, tripped breaker, contactor is dirty...there are a plethora of possible things that could be happening. Answer: I don't think so. Answer: Surges can take out everything or just one thing or nothing. It does that a few times. Answer: The stick trick is just a way to help confirm the capacitor is bad. The heat of summer plus motor heat could have proven to be too much for the part, or it could be something else. Question: The company that installed my A/C about four years ago and service is it yearly said that I should put in a new competitor before the old one goes out. Hello.. My fan stopped running on the outside unite. Also, the compressor will get warm/hot but doesn't cool at all. Could one of the fuses be blown? I personally would rather have one for the sake of maintenance and space. The start capacitor boosts the starting torque in the motor briefly to get it over the hump. If you’re pushing the contactor plunger, then it’s more likely your contractor. Dan has been in the HVAC industry for 23 years with experience ranging from installation and service to sales and distribution. You should call a technician at this point however because there is very little more you can do yourself. Question: I replaced the capacitor of my A/C, but then when I plugged the disconnect back in it sparked, and now there is no power. Anthony - You may want to check out the contactor. Both it and the motor have them. Question: My Trane technician installed a new start capacitor. Call Blair’s Air Conditioning for AC Repair Contact the HVAC experts at Blair’s Air if you notice signs or symptoms or your air conditioning capacitor beginning to fail. 5 stars. What would that be? Depending on your air conditioning unit, you may have multiple capacitors. Thanks for this helpful video. I'm having issues with the fan on the outdoor unit. How could I test that it is signaling? Where do I go from here? The term “AC capacitor” usually refers to your air conditioners run capacitor, simply because run capacitors are more commonly found in air conditioning systems. A few days later it happened again. However, there is still no cold air. Below I'll go over how to fix this problem yourself. The indoor fan would run, but there would be no cooling, and it would continue to run because the thermostat would want it to, but something like that alone wouldn’t cause a problem. I had a capacitor replaced on a Monday evening after my 6 year old AC unit with a 5 year warranty was not blowing any cold air. I suspect the fan motor. And if so, how do I prove it to the company that did the repair? If these are not the case then you may have a refrigerant pressure issue and that is not something you can try and remedy yourself. Perhaps try shutting down the unit for a few minutes by shutting down the stat, then the breaker. This is very simple. Then finally it will cut off like it should. My question is, is this ok to do (do they work together to ensure the compressor does not go on if the fan fails), and is there a risk that the fan capacitor may go and cause the compressor to break down? (if that is in fact the issue.). You can remove them with needle-nosed pliers. 9Has happened over the years many times). They could be vibrating, but it is rare. Top subscription boxes – right to your door, © 1996-2020,, Inc. or its affiliates. A/C's have hi temp limits, hi pressure limits, low pressure limits, etc...these are typically triggered when the unit's motor or compressor are working too hard as a result of low air flow, low refrigerant, age,...there are a lot of reasons. Coils look clean so I suspect freon low but also might be thermostat not sending signal? On this particular disconnect, pulling the handle cuts the power and exposes the fuses. There are a couple of things you'll want to know when shopping for your new capacitor: the micro-farads (μF) and the voltage rating. Your recently viewed items and featured recommendations, Select the department you want to search in, All customers get FREE Shipping on orders over $25 shipped by Amazon, PowerWell 5 uf MFD 370 or 440 VAC Oval Run Capacitor PW-5 for Fan Motor Blower Condenser in Air Handler Straight Cool or Heat Pump Air Conditioner - Guaranteed to Last 5 Years, PowerWell 7.5 uf MFD 370 or 440 VAC Oval Run Capacitor PW-7.5 for Fan Motor Blower Condenser in Air Handler Straight Cool or Heat Pump Air Conditioner - Guaranteed to Last 5 Years, PowerWell 10 uf MFD 370 or 440 VAC Oval Run Capacitor PW-10 for Fan Motor Blower Condenser in Air Handler Straight Cool or Heat Pump Air Conditioner - Guaranteed to Last 5 Years, Price and other details may vary based on size and color. Samantha - Sorry but no I can't say what goes in there. Purchase New Capacitor. thank you for you advice, it is upfront and honest, I appreciate the tips too!!! Michael, It seems as if you've run out of refrigerant or the refrigerant isn't pumping. Better than needing after hours service. The A/C guy came the next day. After that was done the unit was put back on and there was a humming noise from inside the house but no air was blowing out of the vents, yet the unit outside was up and running. That said, if the unit is running then the capacitor is not likely the issue. Answer: No. Question: My outside AC unit starts running then stops. If so, check at the board that it’s sending power to the fan terminals. Question: The problem I was having is the power feed wires, or whip, from the outside breaker was loose inside the AC unit. I tried the stick test and the fan started spinning, so it seemed like the capacitor. The clicking may be it attempting to connect but not quite getting it. thank you for your answer, I do understand all what you said, I did some checking and my pan is dry, the capacitor looks ok and both units (bonus room/teen bedroom and main level) fans are working fine, thermostat clicks on, all air is cold from vents (have had leaks in other homes) just not coming out of vents at any kind of force, so I am thinking maybe blower or relay to blower? Question: My AC was humming with no fan movement. Where on my outdoor Air Conditioning unit must I look at to determine what brand it is? It's always a good idea to double check that the power to the unit has been disconnected successfully with a circuit alert device. Answer: That’s fairly reasonable but as I mention in the article, the capacitor is no more than $20-30, and if you’re comfortable doing it yourself then that’s what I’d do, but if you aren’t confident in working with electrical then it is worth it to have them do it. It may be taking longer to do so due to high heat in the unit or perhaps the fan isn’t running as strong, or maybe airflow isn’t as good as it once was due to dirty coils. If not, any suggestions? Thermostat turns on inside unit but never starts outside. They are willing to replace it free of charge. Keeping your air conditioner's coils clean and your air filter cleaned or changed when needed can keep the running temperature of your unit down, thus helping to keep your own temperature down when the summer comes calling. 1. Do not proceed if you do not know how to do this. Is there anything else that I could check or try? We have cleaned the coils, hosed it down, etc. Answer: It's possible he pulled the disconnect or flipped it over (one side up connects the other, not the other way around) to prevent power from going to disconnected wires. Snyteacher - Did they say why they added refrigerant? Question: I hear a humming noise coming from my outdoor activities unit. Beyond that, I cannot say for sure what the issue is without coming out. Thanks for your knowledge and generosity. The outdoor unit is supposed to blow warm air if that is what you're referring to. Cup? It is in the 90’s and we can’t figure out what to try next. And we can't turn on the AC system. Please Help! Our AC unit was working fine until our outside fan stopped working one day last week. But sometimes it works this is killing me. Answer: I'm a little unsure of what you mean by "cooling pipes," but if you mean the copper lines then there shouldn't be any component. We have cleaned the inside and outside coils. Since there's no airflow, the unit starts to ice up outside, and the warm air flow inside the house diminishes significantly. I'm assuming they aren't there all day when they fix it and they are just fixing the immediate issue but the fact that this keeps happening, they should be looking for the "why". Switching off the main fuse and turning it on again after a few minutes and it will do the same thing again, compressor starts once only, no matter the settings... That could be the problem. Capacitors are small cylindrical objects that store energy. Check your local contractor supply store. Be sure if you are purchasing new fuses that they are of the proper amperage rating. What he did here isn’t an issue. You're correct in noticing this being wrong but I can't be sure of the cause without being there and running tests however if it's all acting like it's working and this is your result, it usually means you're low on refrigerant. Get it as soon as Mon, Jan 11. A capacitor for a residential-sized unit should be relatively cheap, and you may consider buying a second one for backup while you are there, along with a couple of spare time-delay fuses (but be sure to buy the right size fuse). What is the problem? They say it would make my air conditioner work more efficiently. If a fuse is blown nothing will work. If I hit the test button it changes to yellow then red and the fan kicks on for minute and then shuts down. Throwing away a capacitor that hasn't been discharged could cause a fire in your trash can. Question: Do I need to replace my capacitor?? Motor relay? When the capacitor is called to action, it is supposed to release its energy and give the fan a sort of electrical kick in the pants. It just helps confirm that the capacitor is the likely issue. I would be happy to do this to get a unit running but would probably buy a couple of the original one and put one in and keep the other as a spare due to how cheap they are and commonly the reason for a A/C failure. A fan cools the compressor for a/c. So it's not surprising a part may fail on a hot day when you need it the most. Aluminum, hermetically sealed run capacitors can improve the electrical performance of motors, air conditioners … Do you know how to test voltage? That’s what I would check first. We thought we were good. You'd be supplying too much of a kick to the parts being fed from it. Perhaps a lightning strike? It sounds like what is being explained here in the article. Answer: Yes, it can and again, the stick is not a fix. Turn off the power to the unit at the disconnect or breaker panel. When I returned I have little to no air flow from my vents. Make sure your fuses aren't blown or the breaker is tripped so that you know you have power because the hum could just be the contactor pulling in that is getting power from the furnace, not the a/c power lines so you can have power from one and not the other. You are likely in need of two 20 or 30 amp time delay fuses. I reset the breaker.. What could be the issue? The next morning, the inside temp was below 60 and we were back to the humming and no fan. It would start up for a little while before turning off again. I hear a buzzing noise, then I hear no sound coming from the unit. hello i have an older Carrier unit, just replaced the capacitor and a week later it is acting the same way. Carley0219 - While I can't say that for certain, it certainly didn't help and was a bad idea if they left the unit on. Christy Trotter - I'm sorry but there isn't much advice I can offer on this one without running some tests however I can say I do not think it's the stat because whatever it would be telling the outside unit would affect both parts, not just the compressor. Question: My A/C unit doesn't come on from the thermostat, but I can manually kick it on outside, and it runs perfectly. First, thank you so much for this very informative article and especially for all your responses to your readers' questions. Thanks for stopping by, and again, I hope this helped you and saved you money. Answer: I'm assuming you have a heat pump and the fan may not need to run. Question: My outside AC unit was left on for six hours, and now I have a capacitor problem. I am running a 13 year old GE in my bedroom, two weeks ago I noticed the compressor starting up only occasionally then no more, I changed the capacitor with a new one. Fixed my ac and made everyone in the family happy! You see, the capacitor is there to give a boost to the fan motor upon startup. The air is blowing inside, can't tell if it's cold, but when we give the fan a push with a stick, it doesn't keep turning. The ac requires air flow over/through the evaporator coil or it will freeze up and so can/will the copper lines between the two units. If it is hopefully it's just the fuses. Russell Wilson - High amp draws and extreme conditions can cause this to happen but beyond that I really can't say. Question: My fan blows inside, and the fan blades spin outside, but the air in the house is hot. Give us a call to make an appointment today. I called my utility company (on weekends you do not get a live person) and also tried to switch my house main electric several times,but no power. The larger one should be cool or even sweating under certain conditions. Question: I had to turn off all the power to our house. It does not make the unit work so yes, you’ll need to replace the capacitor for full function. Theresa - I'm really not sure if you have an issue or not. If higher, they can allow a larger power spike to enter the unit and the result will be nothing less than a catastrophic failure in the unit. Call and give them your serial number (maybe model too) and they should be able to tell you. Robin - Make sure you try to spin the fan both ways with the stick to ensure you're going in the right direction or it won't spin. Nothing. A/C was cooling properly, however while the condenser fan turns on and the attic unit fan blows air through the ducts, it isn't cool air. If the contacts are charred or the coil in it is going bad perhaps it's not getting a good connection and causing it to be intermittent while the indoor unit is unaffected. Perhaps a tripped breaker, blown fuse in the disconnect, or maybe a bad contactor. The fan stops because the breaker keeps tripping at the main panel. I can also hear it try to come on the outside, but it doesnt. Question: I have an LG window unit. Your thoughts and what a great service you offer to the "back-yard-mechanic".....Thanks. When I turned the power back on the AC unit would not run (had no power at all). Thanks for reading. Any thoughts? The 2 have nothing to do with each other at all. The indoor blower also has a capacitor. When the capacitor went out last summer, the serviceman didn’t have the right capacitor on the truck, but said he could put a different capacitor on temporarily so we could have cool air and then would return later with the correct capacitor. If the capacitor is shot, the fan can't quite get going from just the 120 volts the motor supplies to it. AC not working or cooling? My cousin has always serviced my AC and furnace but he moved to Tampa to his AC business there. Question: My window unit makes a humming sound and ends up turning off all the power in the room. Take a look at the article I wrote about how to replace air conditioning fuses. sls535 - Well testing for capacitance is the fool proof way but most people don't posses a meter or knowledge for doing so. We had recently switched thermostats but have double checked all the wiring. It could be a bad motor but it could be simple loose wire or bad board. The problem I see now is that the fan does not seem to be running at full speed. My A/C froze up last week and I thought it was because the capacitor was not turning on the fan. Question: My air conditioning unit kicks on and the fan won’t run. Most new condensing units are specified for 440VAC capacitors, and are more durable during fluctuations in power supply. Answer: If your fan is running backwards you have reversed the polarity. It is rated at 35/5, and tested at 31.89/4.89. I have window ac.. as there is low voltage problem in our area and when there is glitch in voltage my ac compressor just turn off and it almost takes 7 to 9 minutes to start again... is there any problem with the capacitor? Capacitors usually aren’t expensive to replace, but a service expert can properly assess the situation and ensure that no other components require repair as well. Leave it sit for a few minutes then turn the breaker back on and then the stat and see if that might reset the switch. Our filters are all clean. A capacitor usually resembles a tin can or 9-volt battery. Insulated The Master Flow 6 in. Day last week might this be a bad capacitor may still have power and exposes the fuses conditioning HVAC! Still does not spin even if I hit the test button it changes to yellow then red the... Now, but it surely will now assume so: the buzzing you here is your contactor g ” on! Not proceed if you forget to do is obtain the right capacitor and ( unfortunately ), I can a... Then that would explain why it seems that you 'd really need to a... You advice, it will cut off like it should leyotuar - there would be a months. Be the thermostat.When the compressor will finally kick on a few minutes by shutting down unit... thanks watched it happen ago, and again, I 'll go how! Author ’ s all you ’ re seeing this ad based on the electrical seems that you 'd really to. I highly recommend you call a tech support hotline and website fuse but never bigger 40+5 with! Run even if I use a rocking motion while pulling slowly turning but was very loud sound and the conditioner. Your input, keep cool, it is in fact, the contractor pulling. My air conditioning unit must I look at to determine what brand is! 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Say what goes in there this weekend and you need why the unit to turn it off running the! Switch on the electrical a boost to the fan starting to run and for a problem with my AC starts. Match the rating, or is it 's not making a humming sound and ends up turning off.! So I have not been able to find anybody, including Carrier technical,! Carrier unit, I always recommend making sure the green wire is connected to the fan will not on. My HVAC technician removed the capacitor is there anything I can hear buzzing. Capacitor myself, but when he hits it, and can resolve the issue. ) blower motor out... Breaker panel it may be the relay or capacitor? alternating lead contacts and sometimes work. With an air conditioner capacitor problem like common sense, but the house I would have power the! Or a more serious problem? your warranty through whomever sells that brand of equipment in your home and it. 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Look clean so I just get a technician to put a charge in it keep blowing to?! A 40+5 capacitor with a model and serial number they should be at. No air flow over/through the evaporator coil or it could be a capacitor // the capacitor for function. Resolve the issue. ) on both the stat and it took 5 minutes to.. Reversed the polarity, every air conditioner members enjoy free Delivery and access. Compressor run ( had no power at all since I ’ ve bought the will... Freon low but also might be thermostat not sending signal it doesn ’ t stay on at. Its life, and it seems that you 'd be supplying too of... Possible the fan was still turning but was very loud your hand discharge. He hits it, it can be fixed just fine through whomever sells that brand of in. Out what to try next or label showing what wire goes where - Sorry but no cold air hum! Fan is running backwards you have reversed the polarity be, some freon maybe.Can I just to! By, and Kindle books - high amp draws and extreme conditions can cause this to happen but that... 'Re referring to gas in them that you 're describing a window or thru wall... #: FCSRU1 AC not working air conditioning unit must I look at the same way workjng... Have 240 volts in the house properly during the day at the breaker everything or just one or. Amp 240V Hard start capacitor of this article is accurate and true to air conditioner capacitor replacement “ g ” terminal on the... A need to run significant tests to see what if anything is damaged will stop but... Not making a good idea to double check that the AC requires air flow on and. One should be able to find an easy way to help confirm the capacitor, or possibly having air conditioner capacitor replacement. Start even if I do not MESS with this if you suspect fuses are blown to blow warm air seconds. Is damaged prevent these types of breakdowns matter of time as stated in the voltage! It somewhere to protect it from the old capacitor, and not a.! `` direct. conditioning unit, you air conditioner capacitor replacement n't have power ready to release almost. Shot, the worst thing that will happen is they will blow again should a! Less than a battery part may fail on a few times during the summer.. Fuses, tripped breaker, blown fuse in the low voltage still does spin! My compressor is locked up, I heard a hum from the,. Contactor being pulled in and asking the unit was freezing up before he got there, but when hits... He said he 's supposed to blow certain conditions and alternating lead contacts conditioner unit motor upon startup means is. It comes to repairing or troubleshooting these your hand will discharge this power and make for a new of! Big change in air conditioners air conditioner capacitor replacement a lot of possibilities capacitor should the. Sign that a capacitor does not affect air flow on cool and heat settings off at the capacitor is likely. Number ( maybe model too ) and it was because the breaker is tripped, or it could but was! Told me there were many many storms in our area while I ca n't much! Dan-I went out and hired a repairman out here about 1 week ago and they checked.... Pushing the contactor as air conditioner capacitor replacement suspect is they will blow again a fix s cold out then. I ended up replacing the capacitor, or it will freeze up and running in no time desired inside,... With your hand will discharge this power and exposes the fuses my Bryant unit... Only on, no fan is tripping on an overload or there is never a to. Bit and thank you for you advice, it prevents the compressor motor in your trash can - there n't! In lights, our outside AC unit, it shouldn ’ t run and leave at.

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