Testing if an HVACR Compressor is Shorted to Ground, Open, or Overload Tripped!

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In this HVAC Training Video, I show How to Troubleshoot if an HVAC/R Compressor is Bad. I show if the Windings are Shorted to Ground, Open, the Internal Thermal Overload Protector is Tripped, or if there is a Bad Electrical Connection. I Measure the Electrical Resistance across the Terminals of a 1 Phase and 3 Phase Compressor and I show the inside of a Burned out Compressor. A Compressor Burnout leaves acidic residue throughout the inside of the system. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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Опубликовано:

29 июн 2024

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Комментарии : 278

@acservicetechchannel 3 года назад

-Join our updates list for an email strictly from us for new videos, articles, products and website features! www.acservicetech.com Mini Split Book on Our Website- www.acservicetech.com/mini-split-book Mini Split Book on Amazon- amzn.to/3ytHJSs Mini Split Book on TruTech Tools- www.trutechtools.com/BooksGuides Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399

@paulpeter2869 3 года назад

Hi Craig! Love your videos! AMANA furnace with a B1 code (module not communicating with blower motor) emerson aa25650l variable speed. Meter reading from R-W is 0.04V at the control board and the rest of Tstat wires are 27V. Do you know what could be the problem? Thanks very much!

@paulpeter2869 3 года назад

The motor is working fine as per ohms test at the 3 pin connector

@dayjavu2586 3 года назад

Do you have a video on low, medium and high temp compressor difference?

@pehvac9198 2 года назад

Thanks for all the amazing knowledge boss

@abelmouzount8817 2 года назад

Hi I just had A unit where we put all new wiring box / outlet then change the capacitor but end up with no running fan after ordering a motor fan condencer got it changed the fan started working but the house isn't sending a cool air in the house ?? So I'm afraid there's a problem with a bad compressor or just cuz of the hot weather that I need to hose it down with water then cool it off then try it works? I wish I could get some guidance from anyone here that faces similar problems? Thank you

@newstart49 Год назад

Great video!! Suggestions and beyond ; 1. If the IOL is stuck open and it shouldn't be (Cold compressor etc), try hitting it with a 2x4 to unstick it temporarily until the repair/replacement can me made. Sometimes a sudden shock will get it to close. Sounds unprofessional, but if you get it going for the weekend, you're a hero! 2. After turning off the power to the outdoor unit, push the contactor fully in- to make sure the power is off and to bleed the capacitors at the same time so you don't get bit. Check as well with the meter to make sure power is off. 3. If nothing is running outside and it should be, don't be fooled. A bad duel capacitor can cause the compressor and the motor both to overheat and shut down. 4. Plastic forceps come in handy for quick connecting a temp wire or meter to another wire or capacitor for testing. 5. Always test a grounded compressor at the compressor itself, the wiring to the compressor may be shorted to ground (Made that mistake one cold day covered in snow- but only once) lol 6. A float drain switch in the main drain can flicker the low voltage on and off quickly causing chatter at the outdoor contactor and also cause the scroll compressor to run backwards resulting in a no cooling situation and a noisy compressor complaint. Install a time delay relay in the circuit and set it for one minute minimum. 7. Always verify your meter is working by testing it on live voltage first! Assuming the power is off because you don't read voltage just might mean your meter just quit working. I've enjoyed HVAC work for over 48 years and I still love it!

@muneycorn6310 Год назад

Love your videos Mr Craig ...You and Mr Brian (kalos) are great teachers.Invaluable to those of us learning online.

@harpoon_bakery162 3 года назад

Thanks for keeping parts that went bad. That helps tremendously to lock on a visual.

@abnergarcia6252 3 года назад

Great vídeo! I would love to see a video where you troubleshoot a compressor with bad or weak valves.

@josepalacios627 3 года назад

Im working on a unit rn with compressor windings that are good but it doesn't start. I tried that grounding test and that's what it was. Im so grateful you made this video lol

@jimbola77 3 года назад

awesome! Craig thank you for sharing! all your videos are so well explained! have a nice and safe weekend.

@acservicetechchannel 3 года назад

Thank you for watching!!

@JuanGarcia-qu8ms 3 года назад

Thank you for your help, I have learned a lot with your videos, I have already started my own business, I really appreciate you help. Thank you.

@resurgensix 2 года назад

You helped me out diagnosing this today. Thanks!

@joseorta9928 Год назад

Great explanation...Im a minisplit tech in Apodaca Mexico...in yr videos I learn alot...

@j.bennett2485 3 года назад

Hands down the best teacher and RU-vid channel on here. For someone who likes troubleshooting and fixing their own equipment these videos are incredible.

@emmaa427 3 года назад

Thx for sharing your knowledge!

@tutata7228 3 года назад

Excellent video, I'm not working on ac at the moment, but I still want to keep learning more and refreshing my memory 😊👍🏼

@acservicetechchannel 3 года назад

You can do it!

@tutata7228 3 года назад

Thanks! 😊

@ApartmentMaintenance 3 года назад

Great video & explanation Craig 👍

@acservicetechchannel 3 года назад

Glad you enjoyed it

@2169scs Год назад

Very good education on AC compressors , thanks

@LloydAveryM 11 месяцев назад

This video was very thorough.

@soheil7673 3 года назад

This tutorial very useful. But that's part of compressor checking. That's electrical checking only. What if the compressor is seized. Or weak. One of the best solutions checking mechanical functionality would. Be pump down the unit to see if it pumps down correctly or not. On the other hand all inverter units have same winding resistance as the inverter controls the load of compressor by increasing and decreasing the Amp and volt rather than winding. Big like to all your efforts during last couple of years. Appreciable

@handyertanto76 2 года назад

Thanks you sir, for delivering this information. It's usefull indeed and comprehensive. Greetings from Indonesia. 🙂👍

@CappyCraigZ Год назад

If you get OL between any terminals, common to run, run to start, start to common, you’ll get OL on your meter. That’s means the winding is open. It’s possible to just have one of the 3 open, 2 of 3 open or all 3 open. If the compressor is severely overheated the windings will be open until the internal overload resets. You can cool the compressor off with cold water or ice. A lot of times you’ll hear the internal overload reset, it’s a mechanical “click” noise. If you check any terminal to ground (any terminal to copper ref line works best) you’ll get continuity or a “beep.” If you get a beep on any that compressor is dead. On a 3 phase compressor all resistance (ohms) from terminal to terminal are EQUAL. On a single phase compressor common to run and common to start=start to run….run to start is the LARGEST RESISTANCE VALUE, common to run is the LOWEST RESISTANCE VALUE.

@huskyng6981 10 месяцев назад

Hi Craig my situation is same like you mentioned Compressor, , Start - to run 2.9k ohm, and common - to start =OL, and common - to run = OL OPEN, And I haven't turn on ac for days even crazy hot weather too, is there anyway I can fix it??? And I also check , common - to ground green =OL, Run - to ground 39k ohm + and meter ohm keep on increasing, and Start - to ground 39k ohm+ meter keep increasing???is there way to fix or I have to replace a 5 months brandnew compressor?? Thank you for your help and your time

@EarthaNell Месяц назад

The contact is pulled in, but the compressor nor fan start. Got readings for compressor wires and terminals, but one wire from condenser fan had no reading. Will dead fan motor prohibit compressor from starting? 1996 Goodman 3 phase condenser unit.

@rolandotillit2867 Год назад

When the shaft seal is puking out oil and refrigerant, the compressor sounds like a bunch of marbles when you try to run it, and there's metal paste in the discharge line, I assumed it meant the compressor was shot, good thing this video exists to make me reconsider.

@clifordmichel8981 Год назад

Great video, Haiti represent

@scetchport 2 месяца назад

Easy to follow info. Thanks. In process of testing those in dometic harrier inverter rv airconditioner.

@spartan5106 Год назад

Excellent video, thank you for sharing

@fernandocortes9420 3 года назад

Hi I love your videos thanks for keeping us learning God bless you Sr 🙏🏼

@acservicetechchannel 3 года назад

Thanks for watching!

@albertrubian2971 Год назад

@@acservicetechchannel Good day Sir First of all sorry to how can i speak English but i hope you understand... What are the possible problems to compress Air dryer with alarm overload and everytime i turn on the breaker it always tripping (3 phase)

@francisguchie1973 Год назад

So detailed - I like

@andyclark7927 Год назад

Well explained I would tell any tech to have a look, good job

@zekenzy6486 3 года назад

Great Video. Have a nice weekend and Holiday. Thank you for sharing ^_^

@acservicetechchannel 3 года назад

Thank you for watching!

@MiguelRamirez-ld7sy 21 день назад

I've been messing with a Honda generator and it's gen Head. I kinda, sorta see some similarities between the two. Then again the extent of my voltage meter experience is the continuity setting on my volt meter. Great channel by the way.

@jaykesapalaran5434 Год назад

Wow thank you very much for sharing your knowledge ❤️🇬🇱

@brianb5779 3 года назад

Damn excellent video and information so thank you..

@jcmendoza8285 3 года назад

you guys are a great source of Knowledge Thank you!

@acservicetechchannel 3 года назад

Thanks for watching!

@jesusadrianbarraza3061 3 года назад

The best chanel for hvac hands down!!!

@acservicetechchannel 3 года назад

Thank you for your support!!!!

@mrman5374 3 года назад

This guy is simply THE BEST!

@acservicetechchannel 3 года назад

Thank you for your support!

@mrman5374 3 года назад

@@acservicetechchannel No really thank you for what you do! We live in a time where training is so poor, but you have helped me tremendously!

@apprenticephil649 3 года назад

Love the video but perhaps showing how a compressor analyzer or start kit can help diagnose a bad compressor would be informative as well.

@sewerat11 3 года назад

What ohm setting do you recommend

@Mudo94 3 года назад

Thanks for your videos man!

@acservicetechchannel 3 года назад

Glad you like them!

@bineshchauhan8713 3 года назад

Wish you long live and better doing Happy teacher day 💐

@tytig94 3 года назад

I have that same meter! I love the dual temp probe feature, and LRA/inrush option. Also the min/max option is cool. Great video, thanks.

@tytig94 3 года назад

Also your vacuum videos really saves me a lot of time. I use your 3 core tool removal tool method with 2 hoses, I pull a vacuum in 5 minutes or less with valves open! My company wants me to train everyone on how to do it, I did give you credit. I wish more guys would spend time mastering their trade away from work.

@noeeon9910 3 года назад

You guys make me want to learn the trade!

@Boojyman 2 года назад

A good meter will tickle your peter

@nihalahmadpasha7607 2 года назад

Good for every technician thanks

@acservicetechchannel 2 года назад

So nice of you

@phongpham1453 3 года назад

thank for sharing your knowledge.

@acservicetechchannel 3 года назад

My pleasure!

@igorshapovalov8527 2 года назад

Thank you, very helpful

@AdamHuishStreaming 3 месяца назад

helpful and great video. thank you so much

@Tito-hvac8 Месяц назад

Great video. Thanks💯

@rogerf3622 3 года назад

Great informative video.

@acservicetechchannel 3 года назад

Glad you enjoyed it!

@frankduarte7109 2 года назад

Great video!

@hermesyanez1431 Год назад

very nice buddy how always!, i love it all your videos, i follew you from Honduras, regans master!

@michealmanuel2143 3 года назад

Very very good information sir Thank U very much 👍

@acservicetechchannel 3 года назад

Thank you for watching!!

@romarro4616 3 года назад

Awesome tutorial

@acservicetechchannel 3 года назад

Thank you for watching!!

@guyinpajamapants6892 3 года назад

Always check at the taps!!!

@tshokaphiri8381 3 года назад

Hi guys, im a service technician in Botswana and love the great work y'all are doing with the videos! Coincidentally i had a similar problem just the other day with a Maclaren 12000 btu packaged unit! The compressor was heating up and much like in the video the thermal overload kept it from starting! I did an ohm test, continuity test and ground test to the compressor and everything checked out! I also tested the capacitor and also did a visual test and still everything seemed legit! I then took the decision to remove the thermal overload to see whether the compressor would start (big mistake) long story short the compressor overheated and shutdown! Can you help on what could have been the problem and what could i have done different

@luiselizalde6757 3 года назад

Excellent videos.

@acservicetechchannel 3 года назад

Thank you

@Gameboy_Steve 2 года назад

Awesome thanks again

@joeyysossa4144 2 года назад

Great video..

@romerogarcia960 2 года назад

Great videos

@simpliciocamirino2271 2 года назад

thank you for that sharing

@Gabriel-vz7ml 11 месяцев назад

Thank you!

@goldhammer561 3 года назад

Awesome video

@acservicetechchannel 3 года назад

Thanks for the visit

@thanglian 3 года назад

Thank millions bro

@baz159 2 года назад

Nice 👍 video, can you make videos on 3 phase compressor phase reversal rotation

@TheWpruden 2 года назад

A megommeter should always be used to test integrity of winding insulation. Not a multimeter.

@rodgraff1782 Год назад

Finally someone who knows how and when to use a megger. I have three AMEC megohmmeters, crank style. It is the proper tool for checking the condition of the insulation on the windings to ground. If a system has moisture or contaminants in the oil, it will fail a megger test.

@user-el9kp7yk2o 3 года назад

Very good

@acservicetechchannel 3 года назад

Thanks

@armandogeronimo8141 Год назад

Good day sir amassing tectnic

@monteglover4133 3 года назад

Not all failures are burnouts. There are 3 types of Compressor failures opens, shorts and burn outs. A standard VOM may not find a high impedance short to ground a merger maybe required. I’m a HVAC&R service tech with 40+ years of experience.

@monteglover4133 3 года назад

Generally shorts to ground are not a burnouts or have significant amounts of acid in the system. A burnout will generate acid from insignificant to severe and often create sludge if any doubt use an acid test kit. At a minimum a high capacity liquid line dryer should be installed when changing a compressor and the refrigerant should always be changed.

@eliogonzalez3038 3 года назад

Thank you so much for your help 🙏 and it help me a lot God bless you

@miguelurbina3004 3 года назад

Yes definitely a megohmmeter is the right tool for this a vom is not capable of reading such values

@TheWpruden 2 года назад

Every hvac tech should have a megommeter to test for those high impedance shorts!!!

@monteglover4133 2 года назад

@@TheWpruden even the cheap ones, will work if it has a high voltage test mode

@davidstofanak3222 Год назад

We just had our compressor fail after 2 years of service. Its a mr cool universal heat pump DIY install. We had an authorized MR Cool tech come out and diagnose it and covered its replacement but I'm worried maybe we wrong during the install. The Tech was super impressed with our work and said everything looks great but I'm worried. The compressor sits on ground level outside the house and the AHU is in the basement maybe 4-5' drop in grade. When we installed the line set we didn't install any oil return bends just kept it as straight as possible hanging them basement ceiling. Having a hard time researching oil return bends not a lot of quality information on it. I'm just worried if we replace the outside unit we would potentially be in the same spot in 2 years if we install it the same way. BTW your videos are awesome!!

@carolineandjaimegonzalez9839 Год назад

Smelling the refrigerant works too. Spraying just a little of bit of refrigerant in your hand and if its smell like burnout tells you that you have a burnout compressor as well. That's just another easy way to identify a burnout compressor.

@acrservicesmathewr7565 Год назад

The oil will also be black. Or darkened. It does have a terrible smell when it burns out or I have seen a ton of foam which indicates liquid migrating to the compressor oil and sludging it

@rodgraff1782 Год назад

Also the wonderful smell of phosgene gas.

@ismailahmed8031 2 года назад

good job

@acservicetechchannel 2 года назад

Thanks

@steelod1528 3 года назад

Hey craig could you do vids on light commercial equipment not too many vids on that

@bc4092 3 года назад

Holy Hands!!!

@douglieberman6406 Год назад

That means we are looking a variations in current related to different resistance, or the resistance and current are inversely proportional. As the resistance goes down the current goes up !

@MrRalph438 3 года назад

Have your book and quick cards, Posters are also helpful. Recommend them to everyone in HVAC Trade.

@acservicetechchannel 3 года назад

Thanks a lot Ralph!

@Reefertech 3 года назад

So basically if the compressor is off on overload it would read OL between windings? And if it’s shorted to ground you would get continuity(tone) from the shorted winding to ground ?

@specialK_hvac 3 года назад

If you measure ohms between run and start but not common and run and common and start that's am internal overload that is opened

@officerkrupke4966 Год назад

You would read continuity to ground on all windings since they are all connected

@ajenjohnson7413 Год назад

I do enjoy your videos, great job there, but I do I have a question. I have a heatpump ( portable ac) and it is kinda noicy and I did some research on that and I learnt about using something called ac compressor blanket which wraps the compressor completely to insolate the noise it produces, can I use that on my portable ac compressor? If yes can I make a homemade cushion ac blanket and use that instead? What is your advice, please let me know. Thanks👍

@mikemorton6219 3 года назад

If you get acid smell from refrigerant, it's a bad burnout. Put ammeter around all 3 compressor wires. If meter moves at startup, compressor is grounded.

@Niranjan_Desai 3 года назад

You are great. A++++++

@acservicetechchannel 3 года назад

Wow, thank you!

@hvacplayer3238 3 года назад

Nice thx. How’re you liking that uei black multi meter?

@hectormedina9009 2 года назад

Continually blowing

@heatncool 3 года назад

On thermal overload does it open 1 winding or 2? It opens winding between common and start? Or both between common and run?

@jackmcdonald7391 3 года назад

I read ohms to ground between a compressor winding and the copper line to it and when I plugged it in it ran just fine.It was a scroll compressor.Not sure how it was possible but I almost condemned it for no reason

@douglieberman6406 Год назад

I would like to try white neutral line to neutral bar in breaker box for common of compressor, as start to common L1 Run to common L2 And common a neutral line to breaker box neutral. 2 breaker switches for compressor, one for L1 and other for L2 . It just that neutral (white ) is common and also hook up the ground line! Same goes for the 240 volt e c m . ! Just like a 240 v a c light bulb with 2 switches and one neutral.

@omgsogood5524 3 года назад

its also possible for the lower resistance leg to be your starter right? ie, you showed 1.7ohm as the start as its a higher resistance but on my sub zero, im seeing the LOWER resistance leg is indeed the start leg [ its the leg for the capacitor ] for BOTH compressors. funny thing is i've checked both compressors and resistance is good as well as no short to ground. but for some reason, the freezer side is just not getting cold. also checked the voltage going into the relay as well as the capacitor.. so kinda scratching my head

@shaneisaac1184 5 месяцев назад

Hello Craig, which of your books would be best to learn the fundamentals of hvac split and troubleshooting methods? Am trying to save costs by DIY as much as I possibly can. Thanks.

@wtfman5313 3 года назад

Just for info, I was taught that OL on a DVOM / multi meter is “Open Loop” because an electrical circuit is essentially a loop.

@thembones12 3 года назад

OL = Open Line = Open = No Continuity = broken connections = broken loop = broken wire = OFF line = broken circuit = it's not connected, it's open....

@wtfman5313 3 года назад

Dt Candia - yeah, open loop.

@SpottedEagleOwls 2 года назад

I have made a mistake by swapping the LIVE and NEUTRAL wires. Will this damage my compressor as my input and output pressures always stays the same ?

@wasimedoo1506 3 года назад

Some time the compresses read good but when it starts to run then you know it will run and stall

@techfive7202 3 года назад

I had a carrier 2 stage residential compressor that threw me off. All terminals with plug removed showed continuity to ground but the terminals ohm out at .6 .8. .2. Not exact numbers but close. Normally the ohms are higher plus I never seen them add up when it is grounded. The compressor had 2 plugs which I never seen before. The other plug had only 2 terminals that I did not test. It was 2 stage obvious. Would trip breaker as soon as the unit turned on. Unplugged compressor and the fan would run. Another odd thing is it would trip as soon as I put the disconnect in without the contactor engaged

@kennethlobo4420 3 года назад

Thank U Craig for this video and especially for the 3 phase compress test. Just a question could a meggar also be used.

@samuelvalenzuela4541 3 года назад

Yes Sr

@vsjapan 3 года назад

Great video. What is it that is causing the ac breaker trip frequently? Checked all the electrical of the condenser unit and all seems to be good. The capacitor is new the fan motor has no issues the contactor looks good. Could it be the compressor causing it? If so how to diagnose and fix? Thanks.

@thembones12 3 года назад

Check the circuit breaker itself...Make sure that ac breaker it not warming up or hot when you start/running the compressor, check the temp of the circuit breaker-using HVAC infrared thermometer...Also, With your HVAC clamp on ammeter, check the Starting Load Current SLA and Running Load Current RLA...

@vsjapan 3 года назад

@@thembones12 Thanks for the reply. Just for your information, it was the compressor. It was overloaded with Freon. Overcharged with the Freon. Recovery of the freon did the trick. The breaker has not tripped since then. Thanks.

@belkacemfekkane2199 3 года назад

an alarm (compressor B fault) in a 30rqm / rqp 160-520 heat pump. Is the problem in the soft or the ccompressor?

@mickeylojkar5769 2 года назад

On a 3 phase compressor, 2 windings reads the same. One is higher than the other. Is that term called shunted winding?

@mtbbiker6401 14 часов назад

Are there better connectors for compressor wires than using wire nuts?

@andycamm6317 3 года назад

I wish people would actually test a compressor correctly before condemning them

@sonamtobgay1797 Год назад

Plz can u explain me why my cold store getting off time and again..I had change contactor also

@roymarksberry4152 10 месяцев назад

If you get completely on your meter from one of the terms on the compressor

@RitinPali 2 года назад

Daikin 1.5 ton inverter split ac. 5yrd old. R32 gas running pressure 150psi. Current 6.3amps Both indoor and outdoor coils have been cleaned. Service Technician says it's ok. But it's not cooling. Temp in the indoor blower showed 16'c or 60'My brand new split AC showed indoor temp at 6'c or 43'f Previously compressor would heat up and trip. So got the outdoor pcb repaired. Now it doesn't trip but keeps running. And does not cool the air. The discharge line had a bad pinch in it. It ran throughput last season. Am out of ideas any help greatly appreciated. TIA

@abmtz8537 3 года назад

Is it normal for my ac compressor to be wet from the thicker copper line down? It’s also taking very long to cool down my house.

@techdan7098 11 месяцев назад

My technician came today and put the clamp on the black wire while the system was running. He said the compressor was bad based on that reading alone. What should be the voltage when connecting a compressor to the black common line while running? Can you really tell if a compressor is bad by just clamping the black wire?

@samersarah957 2 года назад

Is that better prove or using merger? Thanks.

@SarahJoRDR2 2 года назад

I'm a 63 year old female and yes we still get Cheated. A service guy checked my wire outside said compressor was leaking in my house but never went inside, anyway wanted, $2,600 to fix it. I have no son or husband so any small info the better for me. Thank you

@TripCoolLang 2 года назад

Hello I have a 35 years old GE fridge I get resistance from the compressor Common to Starting reading is 2kohms, Common to running 25ohms, and starting to running more or less 2k. Is the compressor ok? My fridge is running but normally it runs loud but now my compressor runs more silent and turn off after few seconds or minutes. I test also the 3 pins of the compressor to ground it has a resistance about 10kohms. So I need to replace compressor?

@Thomas-eh8lb 8 месяцев назад

Why cany you clean the coil if you can clean the lines? Thanks

@turbolag98 3 года назад

Is it a failed compressor if the compressor is pulling double LRA even after installing a hard start kit but the windings have continuity? Compressor isn’t tripping the circuit breaker either

@specialK_hvac 3 года назад

Yes that would be a failed compressor if it is mechanically locked up like that. Sometimes you can give it a bump and it will free up but that's a stop gap solution