most common AC problem - blower doesn't come on - HVAC condensate overflow shut-off device problem

[@kellypepper3395]

I can't thank you enough! My husband was out of town and our air wouldn't kick on. It was 80 degrees inside and 93 outside and I had 2 sick kids. I followed the same steps you did and when I got to the safe-t-switch and opened it, it gushed water! I ended up using our pressure washer to push out whatever was clogging the line and it was disgusting! Something had crawled in there and died. You saved me hundreds of dollars for a repairman. Truly, thank you!!

[@MrCaribe65]

Good job miss. 👏

[@jollyscaria1922]

Rc 24 ry1 24 strge ry124 rc 24v g blower wire 24. V

[@only1martina]

I can’t thank you enough for this video. It’s 4 am and 84 in my apartment. I checked the safe t switch and it was filled with water. I used a Doppler to suck up the water and my air came right on, thank you again!!!

[@smykster007]

Dude its nighttime, and almost 90 degrees outside... My HVAC Control unit went dark and the AC turned off. It supposed to be 100 tomorrow and I was freaking out. I watch this, when downstairs to the basement, and kicked that pump a few times and BAM, it came back on. I love you.

[@imlew7853]

I thank you so much. My hvac totally stopped working including the fan. I cleaned the drained pipe with oxyclean that somehow bubbled up and made its way to the float valve. It's over 90F here in Florida and I rushed to call for a service tomorrow. Thank God for your video that I had cancelled the service. I pulled it up and the unit started to kick in. I wish all repairs were all this simple. THANK YOU SO MUCH...........GOD BLESS.

[@ALCASINO17]

Thanks for posting this video. My moms ac would not go on. I pulled out the overflow switch and cleaned out the tray. Reinstalled switch and ac powered up. You saved a widow on a fixed income a service call. For that I thank you.

[@billymitchell6850]

Thank you, no low voltage power to my thermostat. My float was okay, but the low voltage 5A fuse was blown. You led me within 2 inches of the problem. Thank you, I would not have found the problem without your video. Took me less than an hour. Thanks to you, my wife is happy.

[@SOLLAIUSA]

My Friend....thank you so very much for this video!! I live in a hot moisture South Florida and a brand new AC Unit started to goes On and Off intermitently. I have Nest Thermostat and my first call was a faulty Thermostat. Went to Old School analog thermostat...same problem.. Than I had a conclusion the problem was with the AC Unit. I saw all kinds of videos related to Intermitent AC unit causes and your video was the direct to the point. The problem was at the switch but not because a faulty switch. The problem was that the drain pipe that takes the condensed water to outside of the house had some kinda of limbo and it was overflowing the pipe and cutting the power to the AC. I got my portable air compressor, blew some air to the pipe...put some bleach over to kill the remaining limbo and the water started to flow out again. Thank You Amigo!!

[@catherineviann1911]

OMG! Totally love this video. I had no clue as to what the problem was with my blower. Moved recently into this house and my blower would hum like it wanted to start and would not unless i gave it a good smack! After watching the video I located water sitting inside my shut off device and which then alerted me to water and scum sitting in the drain pipe! Cleaned and dried everything out and now my beautiful blower is doing her job! Cool again in South Florida!

[@DIYTinker]

thanks for the kind words. i just like tinkering with stuff and AC has been my new 'fun' hobby. Thats wonderful that you are going to school studying HVAC. I would love to learn it professionally someday :)

[@petenielsen4119]

Don't know if you're still following the comments but thank you very much 1:30 in the morning here in Arizona and it's 98 degrees I didn't know newer units had a float switch for the condensation line . And they drywall. This one in under the unit. Thank you very much!!!!!

[@Luna-fn1wx]

First thank you for this video. I live in Florida and my AC just stop working. The fan was not coming out, so we went to Home Depot And fallow you instruction and buy the capacitor but they didn't have in the store. Then We went to the AC hardware store and found it there for 29.99. AC it's working now! Thank you from Florida!

[@ericlopez7120]

Overall good video. For future reference, you can check, using your multimeter, for continuity between the safe T switch wires. You can also run the 24 volts directly to the r terminal to get it running while you are either waiting for a new safe t switch or buying one. Also, good job telling your audience about the potential clog that could have formed in the primary drain line.

[@natef877]

Mr. Tinker, I followed your instructions. My furnace has a switch rather than a 3 prong plug. I flipped the switch and the whole thing reset! I have nice cool air. I didn't have to wait for a tech or pay several hundred dollars. You gave me the info to fix my problem by 0:50. Thanks again.

[@MrAzzi4]

Bingo - Checked 3 things: 1 - Checked if Thermostat working / Working with 12 Volts 2 - Checked Fuse inside furnace - Not blown 3 - Last I replaced the Safe-T-Switch ($15 part) ==> Bingo ==> it worked I would have never guessed it if not watching your Video A contractor would easily charge you $200-$400 Thank you for the Video

[@zx10rpower17]

awesome job brother! I don't have this problem. my thermostat was flasginh "cool on" and was just doing a quick search to see what it could mean. wanna be prepared incase something goes wrong. I'm an electrician and your trouble shooting steps are what a true pro does. keep up the great work and stay safe. subscribed.

[@corabass68]

Justin

[@spinx2273]

You find a solution to that "cool on" message? I'm facing the same issue - abot to try the steps in the video.

[@montanalrl6622]

Thanks so much. Last time repair was $700. I could not get the condensate lines apart so I sucked it out with a shop vac. Worked!!!

[@mancavemusic2728]

Thanks so much for a very easy to follow and great solution to our problem. I was fortunate that after drying out the chamber and allowing the switch to dry it kicked on. We are grateful since we are in South Florida and enduring the worst heat in over 100 years. You rock!

[@tarique227]

i was just having the same problem couldn't figure it out for hours until I seen your video, thank you so much brother, you really helped me god bless

[@alecruzcruz9047]

*We're very happy with the unit. Pretty Easy to instal **Fastly.Cool** too.*

[@langsbr]

Great diag tips - mine wasn't the overflow shut-off but a fuse. The instructions helped greatly in knowing where to check for voltage to see where the problem was. Thanks!

[@bfiume]

The over flow shut off was my problem. My a/c is working fine now. Thank you.

[@wddcruz]

This is a great video! I was able to figured out the problem after watching the video. The floating device was tripping the unit. Cleared the drain line as VOILA!! Thanks a lot saved me LOTS of money!

[@dennisellison2619]

Thanks for your prompt reply! To clarify, the condensate shut off the AC only once in five years. The repair guy checked the drain pipe, and it was not backed-up. Also, the unit (not the outdoor compressor) is mounted above the garage so that the water flows down hill. Whatelse would cause the AC to shut off so soon after being "repaired"? Thanks again.

[@Harbinger-2024]

Replaced my blower motor yesterday and saved $1k. Ty

[@bubbaganoosh1387]

Thank you so so much! Saved me $130/hr service charge. You are the best.

[@horsemanofwar86wawahwoowah36]

Hey buddy I was wondering if you had any idea what's going on with my new homes ac. It's a brand new unit and when I set the temp to 75 cool and put the ac fan to on the fan still stops when ac reaches temp. I want the fan to still run but not ac when at temp.

[@THEDOITYOURSELFGURL]

So thankful for your video. As soon as I opened the safe t switch the fan started blowing and there was water inside the pipe. I just need to figure out why and how to drain it.

[@MichaelLavi]

I had someone install new wiring between blower/furnace and thermostat, but now no power in the blower, no voltage at step found 1:20 of your video. What could my problem be? Was working fine before his work.

[@skuter7049]

Hi DIY Tinker, so, at 11:30pm this Saturday night, my ac decides to give up. No cold air coming out of the vents. Checked the filter, could use replacing, but still wouldn't work with the filter temporarily removed. Went outside to check the fan and it's not moving. Noticed a coating of frost on the line connected to the compressor as well as part of the compressor. Out of curiosity, I checked the air handler in the attic and noticed water collected in the tray (which I don't recall seeing before). Where should I start? Capacitor? This is all new to me. Any help would be greatly appreciated!

[@DIYTinker]

sounds like you might need professional HVAC help. If it turns back on the next day, then the system shut down from overheat. If that is the case, then you might have a dirty evaporator coil, low on refrigerant, or something else... here is a evaporator coil cleaning vid: How to clean evaporator coil - AC freezing over with ice - cleaning dirty HVAC coil with cleaner Musty Smell from Your AC Vents? Check and Clean the Evaporator coil - HVAC freezing up with ice Cleaning all in one outside unit evaporator and condenser coil - Package Unit Air conditioner AC

[@jaymeez]

Hey man I have a home which is only 5 years old and my AC isn't working. When I turn on the AC on the thermostat everything turns on, the compressor and fan outside kick on and the home fan turns on too, but almost nothing comes out of the vents. I got on a ladder and felt very tiny amount of air coming out which was cool air but didn't cool anything because almost nothing coming from the vents. My air filter is clean and I don't know what I'm looking at in the attic. Can you help, any ideas?

[@etitefera9501]

oh my God I'm waiting here to have the service guy to call me back and started watching this i found the problem I think of you so much you are the best 👍👍👍

[@Dave-um1hl]

Hi. The screen on my thermostat is blank. I replaced batteries, nothing. A couple days was back on. Now blank again…but, if I press the temperature up, it comes on (not the screen, the furnace). Also, if I turn fan on it comes on. Any ideas 💡. Thanks so much.

[@nerdyman7128]

Hey, found out it was the transformer, not giving the 24v power to thermostat, swapped it out 7 bucks, all is good now . Thanks for the help and all your vids : )

[@melljones8876]

Thank you I watched try to help you video and he recommended you and I definitely got it fixed one of my three kids has bronchitis and it was 85 indoor Thank you I really appreciate it🙏

[@harveynorman8787]

Thank you so much! I had a problem 15 minutes ago. I was able to pinpoint the problem through that 27 volt check. Subscribing!

[@pajhuamhmoob3239]

Where is this pipe located at? Is it in the attic? I can't locate where this can be at.

[@tonyanderson5123]

My Robertshaw RS8110 thermostat is only a few months old, and it works well with the new A/C unit that just install this summer. However, when I switch to the 'heat mode', the furnace would come on and stay on, but the thermostat would go blank. Do you have any suggestion how to fix this problem?

[@DIYTinker]

thats odd... is it a split unit? or a flap that controls the duct opening and closing for upstairs?

[@windowguy855]

Thanks Man! I can read schematics and have a Fluke Multimeter I was chasing wires for 20 minutes saw your video and that was the exact fix...You saved me a lot of time...Thanks a million. Todd

[@cbthethird]

Nice upload, of all the videos on here, this was the one that get my ac going again. Can't believe I forgot that switch! Thanks

[@cobes11]

Thank you for the video. I have one question before opening it up and messing with the wiring. My blower turns on about half the time, the other half it takes a bit of trying to get it going. Once it starts and it is on On then it will never stop. The problem is that it is often times difficult to get it started in the first place, and secondly when it is on Auto it can blow correctly for a while but once it breaks it is done. Will messing with the wires work for this as well?

[@GalaXy808]

I have question, all the ac has a over flow switch? I wanna know bec. If they have the same like the chiller ac.thank you.good video

[@jesseluna4731]

Been doing this for 11 years and never ran into a bad float switch.....good info for the D.I.Y people

[@maryreece893]

My RV ac unit has a terrible freon like smell, is there something I should clean or replace first?

[@225pmac]

When I tested my board, the fan kicked on as you indicated. When I released the pressure from the volt meter probes, it turned off. So I pulled the board off and looked behind, but saw nothing amiss, and no scorching. I only then set the board on the pin-clips that hold it to the blower and all seems to be good for now. Must be shorting against the blower? very strange. We'll see if it continues to operate. then I'll put some kind of insulation between.

[@imanirk]

I hope you read this. So my fan was running but condensor was not in the middle of the night, I checked the capacitor which was bulged so I replaced it. WHile checking the contactor unit, I noticed a cracked black tab on the right side which separates the power bar and the 24v input prong so I replaced the contactor because chainging the capacitor did not fix the issue. Still not working I checked the over float (bar style little giant not round shaped one) that is attached to my over flow pan under the air handler. I have a direct drainage besides that overflow bar on the pan. I am confused a little when the float is tested to be bad? I guess my question is what should the float show volt ohms or volts wise when checked in which position? When tested with flow down it seems to set at ohms 0.3 but seems to bounce around. With float up as if water is present it sets at 1 ohms. So when the float is up is is completing the white wire to white wire ends connection such that it is the same as if the white wires were directly connected together that its pig tailed to or is it breaking the white wire connection? This is the last part I am can to try to replace before maybe calling service. The other things I tried are the RED/GREEN for fan and then RED GREEN YELLOW off of the therostat to see if all parts come on to eliminate a bad thermostat possibility? The fan comes on but the condensor still does not. If I push the contact bar on the condensor contactor on condensor panel area the condensor fan and condensor come on. When I checked the 24v to the condensor I am seeing 0 now. I thought I saw 24v at one time but can't remember now if it was when the old contactor was still on or this new one. But right now nada. When I check the leads on the thermostat with wires normally attached of from red to yellow, red to white or red to green I see the 24volts. I even checked the output of the 115v to 24v converter in the air handler by checking the common and red input leads (maybe I should have checked the output leads) that should be feeding to the condensor and did see voltage going into the circuit board of 24 volts and if not enough I would at see the reduced amount I would think on the condensor side. What am I missing to check other than this float but if you could kindly explain what the state does in terms of volts running through the white wire when float is up or down per my ? above. For me I need to know when the float of the bar type is up showing water is that the same as if the 2 white wires were directly connected without the float between? It seems when I connect the white wires together the fan finishes its cycle and never comes on again. There is btw no water in the pan as far as I can tell and so the drain I would think is working. Thanks for any help and suggestions.

[@imanirk]

Also I forgto to mention the float is a little giant brand and when i turn on the ac thermostat i here a quick click twice immediately.

[@imanirk]

I performed more 24v test with the fan running and the float setup back as it was in AUTO/COOL modes. The 24v reading between the red green, or white or yellow was much lower than 24v. When all is off 24v+ shows fully across the same probes. When turning fan to manual and no cool the red/green showed 0 and the fan ran and shut off as expected when moved back to AUTO on the thermostat from manual. Also I ran to the condensor during the original fan in Auto/Cool mode when mentioned volts was much less than 24 at the thermostat but yet not 0 found at the condensor end the voltes less than 1 for 24v check. So I am just going to pop for a float switch to see if thats causing gyrations. Though I tested the ohms reading for the float switch in float down position the reading settled on 0.3 but seemed to gyrate occassionally. When in up or water present mode it went to what I read as 1 but to me meant the open condition. So that gyration on the down side may not be connecting the white wire continuously with a good 24v flow? Any other suggestions I would appreciate.

[@sparkymike8995]

You were 100% correct about the condensation switch. Removed it and extended the float down and the AC worked. YEA

[@petersmith7945]

Great videos. I have a different problem that I don't see in your video library -- my a/c unit seems to be working, but the blower fan in my furnace isn't turning on. It (the blower fan) does turn on when I have the system set to "heat" or "off" (if I set the fan to "on" instead of "off")...but it won't come on when system is set to "cool" -- even if I turn the fan to "on" instead of "auto". Any ideas on what to check?

[@DIYTinker]

The blower fan has different blow level. When you want Cold air, the fan is at its highest setting, when you want heat, then the fan is set to its lowest setting. There are 1-2 in between settings that arent used. Either your circuit board is bad, or your fan. I dont have a video testing the blower, but you can use the following two videos that does combine the idea: RUUD furnace fan not starting - replace burnt control board - adding new flame sensor - no heat HVAC AC fan not working - how to troubleshoot and repair condenser fan motor - trane air condition

[@petersmith7945]

DIY Tinker I had my fan motor replaced this past winter. Does that trigger any thoughts? Otherwise, I'll just keep trying things. Thanks for the help.

[@petersmith7945]

DIY Tinker Figured out my problem. The service tech had connected the black wire from the blower to "heat"...and nothing to "cool". Moving black to "cool" and blue from "park" to "heat" solved everything. Phew! Free solution!!!

[@DIYTinker]

oh nice catch. But why did he do that?

[@hittheroad001]

Thank you so much for this video! My blower wasn't coming on, and turned out it was the condensation safety switch. I (temporarily) fixed the problem by drying out the unit and soaking up the water in the tubes, but do you have any suggestion on what I should be looking for in order to prevent the condensation overflow in the future?

[@JustxLiving909]

hittheroad001 ever find a answer

[@bigpun2k6]

regular wrench to loosen the drain pipe plastic valve? the grooves on it make it hard for me to loosen by hand and i was nto sure best tool for this to remove it so i can clean the drain pipe.

[@DCSTARMAN]

Hi, I keep having a clicking sound when trying to but on auto. Then nothing comes on, but it works when I just put it on, on. Scars the issue? Has been happening for a few weeks now. Sometimes it actually turns on but only for a short while.

[@nerdyman7128]

Thanks for the quick response, so I get no voltage..on any wire. The pipe is clean, guess i'll try replacing the over flow switch, do they sell them at home depot? there any way to bypass the switch (just to see if that's the problem)

[@Furrydukes]

I am experiencing the same issue everything outside is working fine . When I turn on the T stat to cool or heat no air is blowing thru the vents. I just turn the Fan on only. Still the furnace isn't blowing any air . Seems like the blower is the issue. What do I have to do? Can you help thank you in advance

[@DIYTinker]

good point, and your approach is removes a few steps. But, checking the breaker is easier (no DMM required) and it at least eliminates a short circuit scenario. Also, I am trying to describe the situation by showing what all ive checked.

[@dashdigital5869]

wait a minute, so the heater/furnace has to be plugged in in order for my AC to work? i have 2 different thermostats, one for my AC and one for my heater. the one for the AC wont turn on at all but i have power up on the roof and can turn on the AC on the roof by pushing the various test buttons it has ( i have a mastercool unit). i just noticed that my furnace is not plugged in at the wall socket, however. not sure why its unplugged. im gonna try plugging it back in to see if that fixes my issue.

[@nenitecto]

Great troubleshooting. Mine was a bad fuse. Replaced the fuse after testing it with a multimeter and it kicked on. 👍🏼

[@OB.x]

While your video didn't directly help me, it got me to thinking about tinkering , and did solve my problem. For whatever reason, my heater came on when I jiggled that precision box that's inside. Any clue to why it would do that?

[@DIYTinker]

+cvc not sure what is a precision box. maybe you are talking about the control limit switch? kzbin.info/www/bejne/mIjFfXlvgdyEras

[@dennisellison2619]

After running without a problem for three days, my central AC died. I had an AC repair guy check it out. He added freon, checked the circuits and it ran. However, about three hours later it died again. He had suggested a $400 pump so that the condensate would not backup. However, it backed up only once in five years. Of course, he did not suggest changing the low cost backup switch. Any thoughts or suggestions? Thanks! Dennis

[@huabvwj6668]

Can you please help me out? I changed the capacitor already and AC fan still not turning on. I hear buzzing from the contactor, but I don't know how to hard start it. I don't see a button to press on the contactor, though I saw them do it on KZbin. Can it be the hardstart capacitor? It has Kickstart in there.

[@oOM00Do]

Don't know if responses are still active here but how would you test the safety if the system isn't turning on? Is there a better way then removing the safety out of the loop and then running it, like with a meter?

[@jimfeng5348]

Hi, My issue is opposite from the video. The blower (inside fan) is on but outside fan is not on. No cold air. It not happen consistently. Just couple of times in this year. Please advise what I can do before calling professional. Thanks.

[@ElRipper100]

Regarding an ECM motor not coming on, would a direct hook-up...I.e. L1 to L1 and L2 to T5 or t1, run the motor for a check? I just want to see if the motor will run? Thanks

[@dalebrenchley3311]

So confused. My handler worked perfectly and suddenly won’t power on. My dog knocked the drain pipe that includes the shut-off float next to it. The float wire may have got tugged. I’ve turned breakers on n off and same with outside unit. Any ideas spring to mind?

[@797diablo]

Hi, I have a question. On your thermostat. It shoes FAN: auto. I have the same thermostat and mine also says FAN: auto. I want to turn off fan but it either goes to auto or on. Is there a way to get the off option? please let me know.

[@Jdmlsturbo]

Do all HVAC have the same type of overflow switch? Because my thermostat isn't turning on the unit, but the fan in the house will come on. I was thinking about adding that hard start capacitor first.....?

[@caru3257]

YoungTimmy. why?

[@robertgantry2118]

Was the heat pump coming on without the air handler coming on? In other words, was the outside unit kicking on without the indoor unit coming on a few seconds later?

[@DIYTinker]

Most fan motors in the furnace runs off 120VAC. For testing, you could hook up the motor directly to the wall socket. I would skip all the T1, L1 stuff since you might short circuit something. There are youtube videos on this topic.

[@ramc2516]

Hello, my blower motor won't turn on. Thermostat is good, programmed correctly & new batteries.It clicks when furnace or a/c needs to turn on. Pilot light is lit. Does the blower motor have a reset switch that might need pushed back in? Where would it be? Next stop = fuse box. They all look good, but not always true. Thank you so much!

[@adanolandez6461]

I just put in a new fuse in the control board and it burned out. What could be the possible problem? Thanks

[@corabass68]

all shrugging

[@meghantoole3449]

Sometimes my cpmpressor for my house ac turns on and sometimes it don't. Makes a humming noise for a few seconds like it wants to switch on but doesn't. What cam be the problem

[@kirklhobbs]

DIY Tinker, I live in Arizona and I have a furnace/on roof AC unit. When we turn on the AC, the air blowing is far less than normal. It's cool, but just not blowing like it normally does. Any thoughts on where we would start to trouble shoot? Thanks.

[@nevrbdwnruby7484]

I have same problem... But its AC air blowing less than normal...

[@luisLopez-uz3mv]

KL Hobbs check your retur filter.

[@ericlopez7120]

KL Hobbs, it could just be an old blower motor. If you'd like someone to check it out, I also live in AZ and I'm an AC Tech. Trouble shooting this problem sooner than later could save you a lot of money in the future.

[@gregalejanderian9594]

Hey just wanna say you have great videos up..very educational to the public, students in the trade and i bet some technician s out there

[@Waffle_cones]

Did you check those wires that were up against the hot vent pipe on top. May have been a broken wire there...

[@johnroberts5562]

Q- is it only the A/C fan that blows air into the house or does the furnace blower also help do this? A/C unit and fan works fine but the furnace blower stopped working and there's very little air coming out now.... I'm almost sure both worked together to cool the house...

[@rkjessop]

Very helpful video. I fixed the problem with the A/C not turning on even though my upgraded thermostat stated "cooling on". Turns out, I blew the fuse when I touched 2 live wires together during the switch out. I didn't know that I had to remove a panel to access the circuit board. Thanks.

[@bahaiinfosoutheastregion8744]

I have a problem with my traneXE1000 the top casing where the fan is attached was cracked broken by someone and it caused the fan blade to break off. I have not been able to find another lid or top for it the unit works great except the area where the fan is attached is completely broken where can i get another lid or top for this unit ? Any ideas for resolution?

[@DIYTinker]

Any HVAC store can buy that single part for you. For example, In OK, MO, TX, AR, KS area has a HVAC store called locke supply.

[@lucky9Lives]

What do I need to do there is water in where my float switch is. If something is clogging up the drain pipe how do I unclogg it?

[@NeasePanters7]

hey DIY, I can feel the air coming through the vents, the outside unit is working, but my house isn't be cooled. What do you think some of the problems could be? I also replaced the filter.

[@DIYTinker]

search my videos for "run start capacitor" I think your unit outside's compressor isnt running.

[@NeasePanters7]

It turned out to be the Freon was lower, the filter was rusted out and I needed a new capacitor and a filter. My Freon was banned, therefore, was $88 lb. Not a day I wanted to spend $800. -_-, however, the house is cool again. Thanks for the reply.

[@skybluefeather397]

On my Lennox furnace, the small switch on the power control box that houses the power control board is tripping when I try to run the AC. Any thoughts...

[@nerdyman7128]

Hey, at 1:42 you say measure the voltage difference between red and green, how exactly do you do this? what do i set the meter to? and where do i put the red and black leads while measuring?

[@robertosalazar1402]

hi and thanks for you help, i have a portable ac unit LG 10000 is olmost brandnew the first monts work fine but few weeks latter sone times blow cold air and some time blow only the fan mean regular air and, and the reset botton for the wire pop uot, so am push the botton again and am stare the unit again and do the same ting some time blow cold air and sone time regular fan and reset botn pop out can you help wt this problem my freend? thanks

[@1FeArNoEvIL777]

Thanks alot man took three seconds to get my ac back didnt even think about the breaker box

[@inquisitvem6723]

my thermostat goes blank for like 5-6 minutes and then re-appears again and then goes blank again...this repeats itself...i get air blowing, but not cold air. i have a brand new condenser and evaporating coil unit installed like a month ago, so it can't be the compressor or capacitor. my friend said likely a bad thermostat, but shouldn't i still get cold air if thermostat intermittenly works?

[@linwoodterrell]

Thank you so much this helped me today my air has not worked for 3 days and the ac man was here a week ago and said everything was good Every thang you did in your video was my problem too and I live in Florida. Thank you so much

[@jbb8090]

I just installed a new capacitor, yet the fan now runs but then stops. Any ideas? Thanks

[@straightpipec6099]

Yeah, my drain line was clogged. Cleared it & everything work as it should. Very good video--Thanks!!!

[@extremetruckdriver88]

Because of you I fix my a/c . You are A ++++++++

[@mitchellcollins9094]

What type of motor is that. Can you tell me

[@lohengrinknight]

Can I ask you something? My compressor doesn't come on, and the exhaust line gets frosted all over. I replaced the capacitor but still nothing. I don't know what to do now.

[@frankn.7741]

Mine has outside unit and it works when you put it on on but not auto...what could be the problem??

[@AaronHighlife]

Thank you! Found my float switch was installed at a 45 degree angle, put it back straight and everything is working again.

[@ulaenyth20]

How did you test the switch to know it was bad?

[@saelee33]

What if you don't have the switch like u and it's still doesn't come on. It is bad fan motor?

[@bbal78]

in general how long should i wait to do the check to make sure that the 120 V connections are grounded

[@DIYTinker]

no sure what you mean by 120v connections are grounded. But the overflow sensor reacts immediately. you should have 120V or 0V when its tripped.

[@alext.1324]

Hey DIY Tinker, my AC unit outside work well. The fan is turning and the machine is on; however, there is no air coming through my vents. My breakers are all on the "on position", so there's no problem there. This is all new to me. Any suggestions?

[@DIYTinker]

If there is no air coming through the vents, then check the blower motor at the furnace and see if its running. if it is, then you have something blocked in the vents or your air filter is so dirty that prevents air from flowing.

[@alext.1324]

Thanks a lot, I'll check that out.

[@angeldeliz1154]

Thanks for the video, what is the name of the part that you bought online? The unit used to start and blow air, but then when it reached the desired temperature, the fan would shut off but it would still sound like if still want to blow air, but it doesn't. Now I will turn on my unit and it sounds like it is turned on but doesn't blow any air. Could it be the same thing? Thanks.

[@mnpd3]

Every few years or so I have the same problem with the home HVAC; 24-volts not appearing at the thermostat, but present on the board. In every case it's been the four-terminal 24v relay which I replace and forget about until the cooling stops again (only seems to happen in hot weather). Never even seen an "overflow" device on my 20+ year old unit, and wouldn't know where to find it.

[@boma2484]

You didnt know what the device was called but you knew where to look. Fascinating

[@OvelNick]

Once you understand the general idea and basics of its design you can fumble your way through diagnosis and repair.

[@fG-or2xh]

While checking my ac , noticed that the outside ac fan works, but it is not blowing any air or any cool air inside the house neither when I put it in fan mode it blows any air. What could it be?

[@frankmontez6853]

GEEZ , the guy helping me at AC place their place not open today or tomorrow AND I need to ask him again something . He said on blower motor if I disconect the cool terminal wire on circuit board and connect the bottom black wire to cool terminal that ( this is what I'm not sure what he said and needed to talk to him ) if it works ( or doesn't ) that means board is bad NOT the motor ?? OR is it the other way around ?? And yes replaced capacitor . Still the same barely running the blower not full speed and shuts down after a while with new capacitor

[@DIYTinker]

If your diagnostic is correct, then the next thing to check is the blower motor. Its the blower connected to the furnace and evaporator coil. Usually located in the garage or a closet. If the blower runs strong, then you want to see if the ducts are clogged. Two common scenarios are frozen evaporator or a collapsed duct. If you turn off the AC for 2+ hours, turn it back on and you have good/improved airflow then you have a frozen evaporator issue. Cleaning the evaporator coil will fix it.

[@shawnconnolly5525]

Low refrigerant will cause the same issue