How to Check HVAC AC Compressor
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- Опубліковано 1 жов 2024
- How to check the compressor on a HVAC AC unit. This video will show you how to test and verify an air conditioner compressor using a multi meter to see if it is bad or not. A good compressor will have resistance readings that balance out whereas a bad compressor will read O/L or it will be shorted to ground/have continuity between one of the windings and ground. Since air conditioning will not work at all with a bad compressor, this is vital information for anyone diagnosing a condenser unit compressor.
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#hvac #airconditioner #airconditioning #wordofadvicetv
Hey guys! If you think the video starts kind of abruptly, you think correctly :) I accidently deleted the intro portion of the video from my computer. You’ll have to forgive me for not wanting to re-film it. Here is the script for the missing part if you are curious to know what you missed out on:
"In my AC fixing videos, in the comment sections, often times I explain to people how to check their compressor to see if it’s bad or not. I finally decided to make a video of how to check your compressor which I can reference people to instead. Before we begin, I just want to make sure that you checked your capacitor before you start suspecting that your compressor is bad. If the compressor capacitor is dead, the compressor will not start. The capacitor is the silver cylinder looking thing right here. (points to the capacitor) Since this video is about the compressor, I wont be explaining how to check and replace the capacitor right now. I do have a video that shows how to do that though, it can be found in this video’s description. After you have verified that the capacitor is good…. (This is where the video begins)
How to Check and Replace a Capacitor:
ua-cam.com/video/9ZGfvC-PMWU/v-deo.html
How to Troubleshoot A/C Step by Step:
ua-cam.com/video/wzAA4dlp_70/v-deo.html
HIM: make sure you check for voltage again a third time because I don’t want you dead’
ME: carefully placing the screwdriver on the grass, walking slowly back to my phone to call a tech. Decided to live another day for a different battle. Know your limits. Lol
🤣🤣🤣
Don't forget to short the leads on the capacitor, in older models they don't have a discharge resistor built in and can store a deadly charge.
I wouldn't say deadly
@@tillerdogg3232 I would
I would too
Hi. I'm posting here to say "Thank You!" ... you see we had been told by a local contractor that out old r22 condenser was shot and our entire system needed to be replaced. I came across your videos while doing my own research, and after watching about four or five of your videos on outside units, I was able to go outside and, for about $20 in parts get my old one working again. In my case, I had a bad 5 minute delay board. I much prefer to bypass the board then spend 6500 on a new system. I know it's coming in the future, but I'd like to get as much life out of this old system as I can. Thank you so very much.
You're welcome! Happy to hear that your unit lives on! May it have many more good years before it retires ;)
Now that same system cost almost 10k if not more. You waited to spend more money later.
I know I’m late but how do you bypass the board.. I’m going look it up. You telling me won’t hurt anything.. Thanks in advance.
How much longer did that last you?
Post video how to by pass board
VERY VERY GOOD YOUR THE ONLY ONLY ONE EXPLAINED VERY WELL THANKS A LOT
Instablaster...
Thank you very much! My Husband was able to check the wires, and one was burned. He was able to replace it and fix it for free!! 😊
Near the end of the video, when you tested the pins to ground, it looks like you had the meter set on Volts, not ohms. Your readings of 0.00 was volts. If it had been ohms, you should have seen OL. Right?
But thanks for the very informative videos.
Yes . If its open you get infinity. If its shorted, then it will have impedance resistance of a low value or zero. Open circuit on compressor coil should be 0.
Short to ground is less than 1
7
smart kid thank you for sharing their partner a good job, God Bless!!!!!!!!
Spent 5 hours just to learn that my contactor was bad. Only guy that showed me that in my search, thanks.
C-R should be the lowest reading 1.6, not the C-S
I agree, also start and run should be your highest reading💯🤔
THANKS TO ALL YOU UA-cam folks that take the time and effort to help us DIY folks. You probably have no idea how much your information is used and has helped others find out whats wrong and how to fix or investigate it. THANK YOU THANK YOU THANK YOU.
I've done a lot of DIY repairs in my life but had never tackled AC problems before. AC systems are pretty intimidating but with your videos I was able to isolate the problem to the control board in the attic. A loose common wire may have been the culprit that would only manifest itself on the hottest days, intermittent problems are the worst. After hours of chasing the problem a simple turn of a screwdriver did the trick. I could not have done it without your videos. My hat off to you and I will be sending a contribution to your channel as I figure it has saved me hundreds. Thank you!
😎 CKJ you're keeping a lot families stay cool. Without having to pay the Freon Gypsies. That over charge the compressor. Then 6 to 8 months later thier coming back to replace the capacitor and possibly the contactor. You saved allot of families allot money. Great teaching capabilities. You're living proof their is GOD.
Where are the Freon Gypsies
Was it my imagination or my screen or was that condenser coil absolutely filthy?
What a crazy place to mount the compressor! Bit tricky to check the terminals
Have the company come out and pay the service fee. Let them find the problem, thank him and pay him the service fee. Proceed to fix it yourself and if your nice they'll often times walk you through it. Saved big bucks this way
That does not sound realistic. How would you know what part u need to have on hand while the tech is there and thinking he will wait is wishful thinking. Unless it is something that did not require a new part....
Y0u seem honest , where are you located
Thank you for sharing your knowledge. From a new home owner you have no idea what this means. Saving homeowners money is a blessing especially in a time like this. Thanks again for your time and God Bless.
On a commercial dishwasher , the contactor on the hot water booster was chattering . 208 Volt , 3 Phase , about 40 Amps . He pressed the button in on the contactor with an insulated screwdriver . A " lightning ⚡ bolt " hit the unit , flash and smoke ! I jumped at least 5 feet . Wet tile floor and S/S dish tables . The manufacturer said some of the heating elements must have been shorted . Mortal terror !
Very informative. Keep up the good work.
When checking the pins to ground, have the meter on ohms, not volts!!
I think you got it backwards. Start is the highest resistance followed by run, then common...
That's what I thought also💯🙊😁
cs=2.1 , cr=1.6
I just want to say that your channel and especially all of your air condtioning videos are extremely informative, helpful, and easy to understand. I've watched all of your AC videos and this has allowed me to change my capacitor and contactor without having to pay someone to do it! Unfortunately, my 15 year old AC has died once again and after watching this video, I believe it is my compressor. I have continuity on all three pins to ground so I think it's time for a new AC unit. Anyway, thank you again for uploading such awesome videos! Keep up the great job!
The voltage reading on your meter also depends on whether your meter has been calibrated or not.
Hi Very well done...but... also It will help the technician on the spot is ; to speak with the people with the problem ; they will be a better help (history of the equipment) and see if the compressor is tripping the breaker ( this is the second step ) ; third make sure to advice to NON technician ; you know " weekend warriors" DO NOT TRY THIS AT HOME unless they know what are you doing.
Dude, great video, super clear. Thanks.
I need help! Our A/C unit stopped working suddenly. Our thermostat runs, our Furnace turns on, but the air that it’s blowing in is room temp. everything inside seems good, but the outside unit just won’t turn on. No humming noise, nothing. We pushed in the plunger and the unit will turn on. So it has power. Something is just causing the plunger to not push in. We tried changing the capacitor and we had the same issue. We replaced the batteries in the thermostat as well. What could be wrong? Help!
This video should be able to help out with that: ua-cam.com/video/NVPhsK4gK1A/v-deo.html
Thanks for the video saved me the cost of a weekend service call ( bad contactor ) I did not know about the test button!
Question three phase compressor should be all the same readings between all whinings
Hi
My ac fan outside is not spinning. I just replaced a new capacitor.
I actually learned something right now. Thank you dude keep making these awesome HVAC videos
Glad to hear that! :) Thank you for watching and commenting!
Vrey good seftey
Good afternoon, how are you? please make a video on a circuit board with multiple zone thermostat, how does it work? how to troubleshooting it. have a great day
Dude,.. if you have no continuity/no signal/no sound, you don't have a short/short circuit (at least not between those terminals), you have and OPEN circuit.
Thank you for the correction!
My home AC was working ever since we moved into our house for last 7 years.
I hired a guy to move AC from back of the house to side of the house.
When move was completed, the hired guy said, your compressor is not kicking in, which worked for last 7 years, after all of sudden it does not work.
When AC is turn on within 10 or 15 seconds I hear noise like sudden clutch noise, the noise is sound of compressor is turning itself off, while the blower and fan above the compressor is working.
All these years my AC worked and after the move the AC it does not work. I don't know what to do, who to trust.
Just a question,,,,, if the compressor is running , couldn’t person tell it’s running by sight and feel ?
Usually sound alone is enough to tell if it is running or not. The rumbling of a compressor sounds different than the condenser fan.
Future AC/Refrigerator here. Thanks for the videos. They do a “ Ton “ pf help.
remember current flows, not voltage.
Are compressors interchangeable? My condenser is ssx140421cb with compressor ZP31K5E-PFV-830 which has gone bad. I bought part ZP42K5E-PFV-800 as a replacement. Will this fit without any issues or cause damage?
ok i have central air central heat but no furnace???? my ac fan is not froze moves freely but doesn't turn on! I have reset all breakers and still nothing???help please I am in florida and its almost 100 in my house! I am dying!!
On my a c unit I changed the contactor the fan motor and the capisitor it makes a buzzing noise for a second then clicks off nothing happens. I'm not sure what it may be.
Hey a quick question how do you check if your thermo overload is open ?
The thermal overload is at the common terminal on the compressor. So if it opens, you will not have resistance/continuity between Common to Run winding and Common to Start winding.
Long story short, disconnect the 3 wires that come from the compressor and simply check common to either of the two wires. If there is continuity, thermal overload is closed. If not, then it's open.
@@WordofAdviceTV thank you 😊🙏
Thank you so much for these videos I was able to diagnose and fix my AC and only cost me $26 for a new thermostat
and my outside fan continues to shut off and it doesn't sound like my compressor is running should my contact and still be turned what would it still be sucked in even though neither one of them is running
Your videos helped me out of confusing problems! Thanks bro!!!
Around ball park figure how much is the cost to replace a compressor ?
Typically about half the price of a new unit... Which is why people often end up getting a new air conditioner instead.
Gonna recharge system tomorrow after compressor replacement. They said the compressor is prefilled. Does that mean I don’t have to add any more oil at all? Like does that prefill mean that’s all the systems oil in the compressor or just what the compressor needs itself
Thanks for all of the videos
My compressor is leaking from where those 3 wires are on the compressor , my tec says the compressor is blown before checking volts , it cost like $900 so i dont know
If it is leaking from the compressor pins then I would also say there is no need to check any further..
Instead of noting , why not take a picture while you're focused on it.?
Awesome job you explain everything very well.
Someone had already told me this method but wasn’t too sure if it was really accurate. Watching your video really helped. Thank you sir keep up the good videos. Well appreciated
I'm assuming the contractor contacts are bad. Pushing on it creates a minor spark underneath the contacts. When turned on, the contactor buzzes pretty loudly.
My issue is not covered here there are two wires going into the bottom of the compressor through a tube. ???.
Best video for this that I have seen
👴😃👍👍hey kid keep making video it helping a lot of of do-it-yourself project air conditioning
Thank you for all your great videos! I have question for you: when you testing compressor to make sure there is no continuity of C,S,R with ground. you showed resistance reading of 0.00 0 usually means short circuit. The question is: shouldn't that be reading OL or open circuit? OR it should actually read 0.00 because the windings are connected to the casing? Thanks buddy I greatly appreciate it
If you look carefully, you'll see that he accidentally left his multimeter on Volts, which is incorrect. It should have been set to either the Omega symbol for ohms or the continuity symbol. You're correct with your observations.
Your checking Volts @ 10:30 . When it should be continuity 🤣 Good video though. Keep up the good work
*You’re not Your
Hi Jay. I love your videos, and even my 5 and 7 year old sons like watching them with me!
Anyhow, I don’t know if you take questions, but putting one here in case you do!:
I just replaced my capacitor (thanks to your other awesome video that does a perfect job breaking down how to do that), but now it seems to me that my problem is either the wire connection to the compressor pins, or maybe a totally dead compressor.
The fan starts up as it’s supposed to, but the compressor is inactive (no initial compressor “startup attempt” buzzing or anything when the fan starts). Yesterday I took the wires (rubber plug) off the compressor pins, and found that the rubber of the plug had some considerable melting around the plug’s holes to the wire leads. I removed the melted rubber and cleared out those holes to ensure the leads’ connections would be good, and then after I did that and set everything back up and started the AC, the fan turned on (as usual) and I got a big visible spark at the compressor plug. But after that first startup where I got the sparks, for the following startups attempts only the fan started and there was zero activity around compressor startup (as usual).
Do you think it’s a dead compressor, or maybe something more simple/less costly to replace (like maybe a new wire/plug)? I don’t own a multimeter, can will buy one if that’s what I need to do to know for sure.
Thanks if you do have time to offer an opinion/suggestion!!
What do you do if it IS shorted to ground? Is there a way to fix that?
Unfortunately there's nothing you can do, the compressor is shot and the best solution is a new air conditioner.
What a horrible place for a compressor if you need to work on it.
thank N how i meet you bro
Good job kid..but start is highest reading...more windings which is more resistance
For you to do hvac work your outdoor unit looks like it belongs to a trap house
What do I do if I get readings when I short it to ground?
He covered that in the video. It means the compressor has to be replaced.
Shawn Robeck thanks I was able to change the compressor 👍🏽
How do you know if it’s just the thermal overload that’s open and not a bad compressor?
It seems you have the meter set for voltage at the end while testing for continuity.
"If you have continuity or resistance... then your compressor is shorted to ground"
What SHOULD one see if the compressor is good?
Great Video Thanks for your time and knowledge. We really Appreciate it.
hi, can you check the voltage at the capacitor (HERM) terminal? how would you hook the meter? is it BLACK lead to ground and RED lead to herm on the capacitor? and what voltage reading should i get? thanks
Wondering the same. I get a 350 on the fan, but 0 on the compressor. Is it the capacitor?
Do you have a video .on freezer compressor relay test ?
2.1 should be the starting,1.6 is running. correct me if I'm wrong.
Yes, you are wrong this time my dear 2.1 is run 1.6 is start ❤️
@@johnson4940 ok Thanks dear. God Bless.
I am an electrician. I love your videos. Thank you.
trying to hot start my compressor...fan is on and no go..should the breaker trip?
Very unrealistic for the average joe..
one of the best video i seen wow if i have to send a tutorial video it will be this one thanks good job !!
Hi
What kind of multimeter is it?
That's a UEi: amzn.to/45pmOy2
My Compressor is running constantly. After my A/C unit stopped, the outside unit is still running. What could cause this to happen? I smell a rubber sent. Need immediate Assistance. This unit is on the Roof.
Thank You!
👩🏻🦰👆👍
Thanks-you think taking those compressor wires off is hard try putting them back on! My comp is bad, just got a quote of $3,200 to replace, w/ no guarantee of course, that something else could go wrong soon after on my 11+ year old 2.5 system. And R-22 too!
R22 is a system breaker if u have a leak. But I've heard good results with NU22 as a replacement.
Than you for explaination but What about the LRA ?
Dear Brother, In my case the reading between C (common) & S (start) is 5.8 ohm; C & R (running) is 3.2 ohm; but the reading between S & R is 7.8 ohm. Is my compressor OK?
Question. I tested it the way you showed in resistance (the horse shoe) using alligator clips on my meter for better contact. The first reading gave me these numbers: 4.1, 1.3, and 3.5. And the smallest two numbers added up doesn't equal the highest number. The highest number was 4.1, and the other two added together would be 4.8. But you did say it could be one or two off. But I don't know if you are talking about the number before the decimal point, or the number after. Does that sound good or bad? I tested it a second time, and the second time I got these numbers: 4.5, 1.8, and again 3.5. And 1.8 + 3.5 = 5.3, so this time the number before the decimal point is 2 higher. Would that be good or bad?
Also I am noticing that the black wire looks a bit burnt on the end, and there is a bit of rust on one terminal and one or two connectors.
When I did the other test to see if it was shorted to ground, I am not sure what you have your meter set to for that test. It doesn't look like it is on resistance. It looks like AC volts. When I did that test in resistance or ohms I got the O/L for all three. But when I changed it to AC Volts. I got 30. mv for each one when one of the wires was connected to the pipe. O/L when touching the compressor where I scratched it. (Btw, I already tested the capacitor, contactor, and fan motor following your videos - they all tested good. It won't kick on, nor does the fan come on, but it makes a light buzzing sound that I could hear that some people wouldn't even notice. One time before that there was a popping sound when I turned it on. And the capacitor was leaking so I replaced it.)
I have Trane XE1000 heat pump, my outside and inside unit runs, replaced the capacitors for the outside unit. NO HEAT. what do think is the problem.
Probably bad reversing valve
Excellent video , like always n have a good day 😂
compressor making highnoise and there is no cooling effect
Need help on a American starnard heat pump package unit. The indoor fan motor is running and the condenser fan is running. The compressor isn't coming on. I checked the cap and it's good and checked to see if the compressor was bad and it's not. I'm a tech in the trade for 10 years never ran into this problem. Any help will be appreciated. Thanks. Oh the back up heat stripes are working. Thanks.
You have more experience than me then :) But they do say two heads is better than one. So here is some thoughts I got:
- Is it possible that the compressor is seized up?
- Does the compressor hum for a second or two like it is trying to start?
- Is the compressor getting any power at all?
- If it's getting power, maybe try putting in a hard start kit and see if starts?
- So you ohmed out the compressor between all the pins and to ground and all was spot on?
- Any loose wire connections?
- Is it possible that one hot leg is missing?
That's it for now.. If you get the chance, come back and let us know what it was! :)
Wires “ check with OHMS ?”
Compresor pins check with “ continuity?”
my technician said compressor is bad working hard causing AC to trip and said ac will run for 2 hours willl trip again. Well I had all fan turn off and other plugs unplug AC working just fine. every summer people tended to use more electric causing it to trip just have to cut back
If a compressor still turns on and you hear the humm
Wouldn’t that validate that the compressor is Not bad and still is working?? Anyone?
A question to the knowledgeable ones, on my ac unit when is turned on and once temperature is reached to cool the house, right after that point a humming sounds what I believe it comes from the compressor, every time the compressor is trying to cycle to maintain temperature, the compressor cycles with a humming sound like 8 to 10 times before start working as it should, it almost is like the compressor is having a hard time to start kicking in, the compressor was checked and it seems the instrumentation to troubleshoot indicates the compressor is ok, doing a little more research it seems the problem was the expansion valve, it was replaced last summer with a new one but the problem continues.
The AC unit still works ok as longest the compressor cycles correctly after 8 to 10 attempts, summer is around the corner and I would like to get it fixed before this issue breaks something else on my ac unit.
any suggestions what could be causing this issue?
In advance thank you.
Hello sir, if I find a damaged reciprocating compressor, can I replace it with a scroll compressor? Do you advise me on the best way to change the same compressor or change it with a scroll system? Thank you.
A quick question, a replacement of an compressor, can it cost over 3,000.00 PLEASE GIVE ME HELP
My resistance measures 1.2 ohm, 2.1 ohm, and 2.9 ohm. My condenser is currently not running. Capacitor was replaced. Ordering another hard start to see if it can help condenser to start. Does the resistance measurement mean that condenser is broken?
I really hope I have a capacitor issue instead of a compressor. Fan turn on but no cooling and I get a buzzing sound every few minutes from outside unit. Waiting for new 45-5 capacitor to arrive
Refrigerator compressor windings test Run winding .i Start winding 5.8 Run/Start 13.3
Is this bad?
great presentation please keep them coming, love all your videos please do one on icp boards
Thank you! Videos on ICP boards are a little hard to make since there are sooo many different kinds. It's not like a contactor or a capacitor.. Maybe later on I can try tackling it. Thank you for the suggestion!
Purple wire disconnected from capacitor on opposite end…does it go to the compressor?
Very good. My nest is saying is cooling but nothing happened. When i push that manually, it works fine. What could be the issue? How i test the proper cooling wire
Thanks very good explanation. God bless you
What do we do if the compressor is shorted to grown ?
thank you for always thinking of our safety
The red (C) wire keeps burning up from the capacitor to the contactor, right at the contactor. I replaced the wire and the capacitor. 5 days later it happened again. Any ideas?