AC Compressor makes noise when turns off 

Probably back emf generated by fan rotation hitting compressor. Can be fixed with double pole contactor with fan hot moved to bottom. Isolates fan from compressor.

It's caused from the fan motor. Disconnect the compressor and it'll still make the noise upon shut down. Usually only does it when the pad is not on regular ground but on rocks or cement. Tighten the fan mounting bolts as tight as you can by hand and put vibration pads on all 4 corners of the unit. It's worked every time.

Nice timing with the hand tap on the downstairs condenser!

Although there may be some back emf factor with these units causing the fan to jerk, I believe the actual clunk can be coming from a loosening of the fan blade shaft bolt. I observed this happening with an Am Std Silver Series CU about two years ago. The noise started like the sound of these units and gradually worsened over a week or two. It eventually resulted in the fan blade falling off the shaft and damaging the compressor discharge line as well as the blade itself. .

there is another youtube tech who installed Carrier and had the same customer complaint. A loud bang when turning off. He installed a delay timer to turn the fan off a few seconds after the compressor shutoff. It worked well. The noise was completely gone. Just an anomaly that the one specific unit resonated when turning off. Staging the shutdown solved it

Your customer should hear my water furnace compressor at turn off. 14 years old and it has hammered at shutdown from day one. Still running fine. Great videos Ted

Nice to see a pair of new Trane condensers setting side by side.

You service some absolutely beautiful homes.

I hear Copeland scroll compressors on Lennox units shut down hard all the time like that. Just a lot of mass moving around then all of a sudden stops.

My American Standard has that compressor shutdown rattle too, but hasn't been an issue for the 9 yrs I've had it make that sound

Dam for the money you have to spend on these units, it really shouldn’t make any unusual sounds or vibrations cycling through a shut down sequence ? that would probably indicate a less than optimal life span of trouble free usage down the road? It’s like buying a new car with a bad bearing in the engine, it’s all good until it runs out of the manufacture warranty down the road and then it’s on your dime. Just change out anything & everything in that unit under the factory warranty… until it sounds right. make it run like the other unit next to it does. Kinda hard to tell a customer that “oh it’s ok that’s normal”, when you have a comparison unit sitting right next door and it’s working without the issue.. When you’re retired and done and that unit kicks the bucket down the road , their in for more downtime and aggravation..

Forever grateful for your a videos, first summer as a service tech and you ans your videos have helped so much. I see so much wrong in a majority of homes I work home , super neglected and i get overwhelmed. I end up at your channel, thank you sir!

Normal. My XR14 has been doing that since day 1. Running trouble free for 8 years and no problem handling the 100 degree days we’ve been having.

I like your videos and steven lavimoniere you 2 make great material to watch.

I had a Trane 5 ton unit installed in my new construction 8 months ago and it has the same loud noise when the unit shuts off! The unit runs great and really cools my house in southwest Louisiana. It has been really HOT and Humid down here this summer too!

My trane has noisy shut off too. Almost 3 yrs old now & no issues. Just different from other brand I had

ive been working with newer compressors. the ones i learned on in school dont necessarily make that noise because they are older units to be trained on. on the case with the newer compressors, they all stop like that. i just worked on a year old system and when i pulled the disconnect it make that exact same noise. its a manufacturing issue as far as im concerned.

As I was watching intently and turning the volume up, I got scared I was gonna get a full screen scary face and scream from back in the day. 😂

The good ol' 410A jolt. 😎👍

I've never seen a Goodman do that! 😅

Always honest and professional love it brother ❤ not every call is a win but we stay professional consistently finished my last call as a recall was out there last week for annual maintenance she calls us today saying system is down come out right away she explained to me she had a pest control out there two days ago the pest control guy left the power off in the crawl space which killed power to the unit always feels good to be Superman flipping switches

I have the same 4 ton Trane XR. Installed 2015. Mine makes the same noise. No worries here.

The smaller unit seems like the compressor shut off bump is louder.

Mine makes the same noise. Same unit. Six years old. No problems

I have the same 4 ton unit does the same thing had it installed in 2017 zero issues

Scroll unloading is what it sounds like to me? My Amana does the same exact thing and it’s 10 years old and has always done it.

Mine makes a thump sound when it shuts off is it serious?

Mine is new. Makes a gun shot noise when turning on and off. I wish mine was as quite as these 2 you filmed

I often get a whistling sound from my system after it satisfies. I assume it's the pressure equalizing in the lines/coils.

I have a new 3 year old system, not a Trane, that does the same thump. Mine is more at start up. I questioned it as well and was told that all the new style compressors will do this, clutch noise I believe

Had this issue and trane sent me a 2 pole contractor and I was skeptical but it did work. No more noise on shut down.

My Rheem does the same thing as the smaller one...always has and actually sometimes its louder.

Interesting...if those were mine and under warranty...I would for sure be communicating with Trane ! Yes very minor but NOT really normal so Trane should correct it. By the looks of previous comments, maybe it should have a dual pole contactor?

Carriers have problems with scrolls when they shut off they make a thud sounds it’s because a valve is worn inside the compressor

that sounds like normal the valve noise. When the compressor stops there is still head pressure and motor will shutter back and forth a few cycles until the opposing forces equalize and the motor stops in a neutral position.

I have two carrier units that makes a similar noise on start up. Both units were installed when the home was constructed in 1999. They continue to perform effortlessly in the humid Louisiana climate.

The scroll compressor , upon shutdown will make that noise . It's the pressure in the system that actually pushes the scroll backwards for a brief moment. It is Totally normal. On the trane csha scrolls (15 ton) upon shut down they actually turn bakwards for up to 2-3 seconds. Take is easy bro.

Do you think that the compressor could be loose and when it torques on shutdown that it moves slightly? That definitely doesn't sound good (acceptable) on the first unit especially if it's new. I'm not in the business but as a consumer if I paid to have that put in I wouldn't want it to sound like that.

Some customers are annoying 😂😂

Good little vid Ted ... Thx

We have a Trane installed in 2018 and makes the same noise. If you find the cause/remediation please share. It’s mostly a mild annoyance.

I would first check the mounting of everything. If it were a car, i'd check the motor mounts. With this, i'd go for the fan, compressor and even the unit itself. Trane may have left out a rubber bushing.

My Trane is doing same thing. My Tech said if I installed a soft start it would reduce the start up and shut down noise. It didn't help at all. Did I get scammed?

Compressor sounded fine on shut down… sounded like the fan motor to my ear … I have had the same complaint from customer that has a Trane package unit.

My Lennox unit purchased last year does this. A little more louder in fact. Would it impact the functionality or lifetime of the system ?

Looks like the installers could turn some of the units 90 degrees to allow for easier service, the control panel and service area, if heat pump would be a lot easier to service

So noone is recognizing that bruh got lost in his own home.

That was funny right as you touch the second unit turned on Great video

Ted, Please don't oil that squeeky hinge on your work van, we all look forward to that squeek when you arrive at the next job, and open the door 😀 👍 Au

I have a 2023 amer Stan silver that started doing this 4 wks after install. The installer tells me its normal with the new compressor design. I wish they could do something to quiet it down. It runs quiet and the entire system with blower installed. It’s going to get used a lot in Az. Kicker is if the rotary designed compressor wears out the entire compressor needs replaced. 10 year warranty I hope has me covered if it happens.

I have one that makes 10-12 knocks on shutdown. Sounds like someone threw a handful of rocks at it. My service company ordered me a new compressor (scroll) but said to wait until the old one failed as it was working perfectly and using no more electricity than a new one. That was three years ago and it still works perfectly just noisy on shutdown. I don't know if it is a rattling seal or what but pressures are perfect. I just knew it would throw in the towel a long time ago but it has not.

Good job ted❤😂🎉

I have a Goodman that makes those sound like a mouse with slippers! LOL!

My 2014 Bryant 3 ton makes the same noise on shutdown. No problems. Normal.

I bought a brand-new Amana 4 ton, and it does the same noise at stop. I thought was the fan blades, but I stand closed to the compressor and I hear from there and it feel like clan,clan,clan when is stop. it looks like the compressor when it stop. Maybe cause its bran new and the piston inside do that.

We get those calls all the time, nothing wrong. Just homeowners! Sounds fine to me.

that's just a little normal rattle from the compressor shutting down

We had a Trane 5 ton installed in Jan 2021and ours makes a rattle/noise when it shuts off.

Even the Copeland scrolls make that hissing noise when they shut down.

That definitely doesn't sound unusual to me.

Need to put some W D 40 on that door hinge giving chevy a bad name big Ted.

Some people amaze me

I just got a brand new Rheem 5-ton 19seer installed and the compressor makes a chattering sound when it turns off, hopefully that's normal operation 😅

had my compressor on my new 2021-22 trane unit go out at 13 months. original compr indicated made in louisiana. replacement was proudly made in china. maybe pandemic conditions resulted in reduced quality control on new trane. but if a trane laid down after a year can you expect any mftr to be reliable?

Yes, the noise may be normal, however, what is CAUSING the noise? Is it from 'fluid shock' when a valve shuts closed suddenly?

Do you ever have issues with the scroll coming apart in the compressor?

That was the fan motor, not the compressor.

Are the compressor mounts o.k. and not split. I use to see this on some refrigeration units. Thanks

Its that fan thump noise I can make it stop doing that with a double pole contactor

Never seen that too, should call to tech support to get some opinion about it.

Backpeddling or back spin upon shut down mine does that too it's a scroll compressor kinda annoying but what're you gonna do....

Omg. Good luck with comment sir 👍

Have a American standard which almost a year old. It does the same thing also

The Hvac G.O.A.T

My 4 ton does that.

Hi Ted do you know or have talked to Curts the HVAC GUY?

So youre telling me they designed that ac unit to make that kind of noise? I cant believe that. If the customer had the opportunity to “test drive” the unit before they purchased it nobody would buy one. I spent $20k to have 2 american standard units installed and they make the same noise which I was told is normal. I will never purchase that brand again or use the contractor that sold them to me.

I had one do that it was the rubber grommets on the anchor bolts

I added a compressor blanket to my AC yesterday and it cut down on the noise considerably.

That's just the way a scroll compressor sounds. It's spring loaded from the sound of it.

2:16 Smaller unit switches off with clunk. 3:33 2nd unit makes no thump sound.

Holy moly put some WD-40 on your van door hinges 😂

should a newly installed compressor make noise on start up ? like cavitation or a "rod knock" on start up ? I'll have to record it, BUT, I am not getting the same idiot who came out the last time. Yes, coincidently I had a FIRE in my fuse panel starting at the AC circuit breaker WHILE he was here working on the unit.

Trane has got be one of the best ACs out there.

Scroll compressor. That's what they do.

I had a damn goodtime on a trane system with a bad recip the other day....

my carrier is 2 years old and it clunks when it kicks off, and it clunks when it turns on. it replaced a trane i installed in 1990

My Trane XR makes the same noise. It is only a year old.

My next door neighbors newly installed Trane makes a loud clunk every time it shuts off. It doesn't seem normal to me.

Any possibility the compressors are loose on their mounts, and just need to be tightened down a little?

I usually have to be standing around 15 feet away to isolate the compressor vs fan sounds but from the video it sounds like something is missing from the functionality of something 🤷🏻‍♂️ if they donate that unit to my not for profit conditioned space laboratory I could send them some stickers or maybe a hat

Damn.

Play a video of a Goodman turning off and he will feel better

Completely normal. However you would think nowadays they would make even basic compressors quieter. They have the technology just don’t want to spend the money.

Normal sound for a rotary compressor. Their valves behave differently for a reciprocal compressor, and this is perfectly normal.

What are they talking about? That wasn’t that loud shutting down

Hate to see his electric bill having 2 units cooling that house.

My neighbors Trane makes the same noise.

My brand new ac unit makes same noise when it shuts off.

I would have marked the units or disconnects so you and the homeowner knows which is for what floor. Should have been done at install.