TOP 5 CONTACTOR Troubleshooting Problems!
ฝัง
- เผยแพร่เมื่อ 30 มิ.ย. 2024
- In This HVACR Training Video, I Show the Top 5 Problems that can occur while Troubleshooting a Contactor. The HVAC Contactor is what turns on the Compressor and Outdoor Fan for Air Conditioners and Heat Pumps. Supervision is needed by a licensed HVACR Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.
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Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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do u have a video for ohming out a compressor to find common, start and run?
Pro tip : you can watch movies at flixzone. I've been using it for watching all kinds of movies recently.
@Konnor Westley Yea, been using Flixzone for years myself :)
You don’t know how much your helping me with your training videos. I have been doing hvac work for 2 years now. And I will be moving into doing more service work eventually. And your videos help me better understand the technical side. You are well appreciated.
Thanks a lot OSee 96!
This channel is a wealth of knowledge and you explain things very well. Thank you!
Thanks Monsanto!
I've learned a lot from AC service tech. Clear explanation and easy to follow. And now, I can see who's been helping me. Nice bro.
Ha ha, thanks a lot John!
@@acservicetechchannel . No problem. One quick question: Is it possible for a bad high limit switch to prevent the control board from sending 120 volts to the inducer motor?
Well done; very informative! May God bless you and your family! Thanks for the video!
May The Lord Bless You too, thanks!
That was great. Wonderfully displayed information. When consumers have to rely on companies like HomeServe to know what they are doing, videos like yours help us common folk understand better than the novice service tech. This way we are less likely to be cheated by ineptness when they say we need a whole new system.
Vrey vrey impot point yes yes cotactd isidd eigzeing power not caching loos cotacting power not caching isside sprinv point s dust and power clen or good wsy replacing poperly yes
What a knowledgeable kind man you are! I enjoy learning from you immensely! Thank you my brother!
THANK YOU!!! You just saved me $ as it was problem 3. In my case the fan was stuck running 24/7. I just cleaned it, and it runs perfectly.
I once found a tiny piece of dried leaf nestled between the contacts on a no cooling dispatch.
The wind had somehow blown it into the open style contact and that was the only problem.
Great video sir!
Ha ha nice!
Great lesson on the contactor. Simple to understand and diagnose. Thank you for the video
Thanks Ray Ray!
You always do an exceptional presentation. Thanks!
Now if we can get AvE to show himself, all will be well in the universe. Your channel is certainly a great resource. Almost 60k subs in two years is pretty pretty good.
Thanks RJParker!
One of the best videos I have seen!
I do appreciate your technical helpfull knowledge sharing. Adorable Thnks from Australia
Thanks Ace!
This is a great video. Gets right to the point, lays out what you will learn and the explanations are very clear. One question - when the contactor is closed, why would I only get a 6v reading on the high side when it should be 96v (electric car conversion)?
As always thanks for sharing. Good vid.
One suggestion: while this demo was clearly a bench test of the component, a disclaimer on checking resistance across the contacts. Don't want the newbies trying that on a unit while power is attached.
Perhaps instead, showing component testing demo while connected to a unit demonstrating worn contacts as a voltage drop across the power leads.
I always try to teach testing of components with the power off instead of drawing full amps of the components for safety, thanks Dave!
Saved my family from melting LOL. Thank you for this video!
Great video, thank you!
Also I believe under voltage from the thermostat may burned the contactor coil.
I made the mistake to install a Nest thermostat with no C wire, just connected to the R wire for power, and even though the thermostat seemed to work and the condenser unit was working, after a few hours the condenser unit was short cycling. Changing the contactor worked for one day, I'm guessing less resistance so it worked all day until the day after, short cycling again. I pulled a C wire out of the air handler bundle cables and connected it to the thermostat and it has worked ever since, no more short cycling.
When it's Summer in Arizona, you need AC ;o)
Nice to see the face behind the video! Another method that I use in the industry is to measure the voltage drop across each contact. Great video and keep up the good work. 😀👍
Yes, the only reason I don't teach that way is that the tech is so close to the high amperage and I am used to teaching the trade to 15 year olds and up so playing it safe, thanks!
@@acservicetechchannel No problem at all as I fully understand in teaching the younger folks with safety in mind. Have a great weekend!
You too, thanks!
1uyeyrryyar4g r h4
Eh by but ply
Thanks a bunch. Fixed my jammed connectors. Got dirty. 😊
Glad it helped
Very helpful summary of potential issues
Thanks Michael!
Great info. Thanks for sharing
Thanks Deanmartin1966!
Fantastic video!!
This is a great tutorial -- if my blower fan stops -- then I tap it and it runs for a few days. I can actually bang the outside of my blower unit and then it turns back on. I bought a replacement but curious what you think is the issue.
Excellent points
I remember watch this channel when I was in school and nothing made sense because I was so green now that I’ve been I The field for 4 years I’m like duh this is basic electrical 😂
Hey man I’m currently in my second semester of my first year and although all these electrical components like the contactors, relays, and etc etc are starting to slowly make more sense im having trouble fully grasping the electrical side of the job like reading schematics and understanding the sequence of operations of all the components I’m having more difficulty with and It worries me at times because it makes me question if I’ll actually be able to get it down when I go out in the field which will be in about a month. I will be starting my first apprenticeship job, do you think actually being out there working helps more then school to actually understand these things? Am I maybe worrying to much about it
@@xxjuanchoxxhd8724 Don't worry about. Just keep studying and learning. Getting out in the field and experiencing real world problems will help. Keep after it and you will get the hang of it. Don't get discouraged. Good luck!
Haha that’s y these videos are important man and salute to him for training tips on the newbies
@@xxjuanchoxxhd8724we all go through same thing you are going through, never get discouraged sir. (Hope you doing better by now)
Thanks for the sharing
Very good information...nice delivery
Glad you liked it
Actually that was really informative and neat .. Thanks
Thanks MrGreeddyy!
Nice work
Good stuff. I've been having issues with trainees not understanding why the low voltage is not killed when the disconnect is turned off outside on a split system with a single transformer. Also have you thought about covering dual contactors and interlocked contractors on 2 speed units?
So high amp draw on motor or solenoid coil could be due to the low voltage being supllied due to bad contactor or coroded terminals. Excellent. THANK YOU. Does the same theory apply to DC coils. Will they draw higher amps if voltage lower than design ???
awesome explanation....thank you
You are welcome!
Thanke a lot bro it was awesom for me.
Nice breakdown
Thanks Blue Collar!
Great video 😀
Thanks James!
When checking the resistance on the coil, what ohms value is acceptable. Love the vids and keep up the awesome work
it depends on the coil voltage rating, once you expand into other parts of HVAC and refrigeration the coils are not all 24 volt, you can have 120, 208/240, 277, 480v( not often you'll see 480v coils though)
@Daniel Blanchard 6 to 20 Ohms is acceptable for almost most of the coils in single n double poles contactors i believe
Hi Graig,
Thanks for posting informative videos. Most of my HVAC DIY are from your channel. Please keep up the great works.
I have a strange issue with my HVAC: heating & fan only mode = no issue, cooling = issue/thermostat turns off (as if the power is lost) then turning back on (power cycling)
On the cooling cycle, somehow, the thermostat randomly turn itself off (as if the power is lost) and then right back on. When the thermostat turns off, everything got shut down. This power cycling happen only about 40% - 50% of the time. After some Googling, I found that there might be something with the contactor on the out door unit. Is it possible for the faulty contactor to cause the power cycling at the thermostat?
Please note that I don't have a floating switch on my in door unit, just a straight draining pipe down to the sink. The draining pipe looks dry, clear of blockage and there is visible no condensation on the drain pan. Also, I just changed my air filters a week ago.
You are very welcome
Greg, Would you do a teach on the use of a run capacitor as a crankcase heater? Does the capacitor heat the crankcase? As always, thanks for your well presented and informative videos.
Hey Aliso, you would use an additional strap on crankcase heater that is wired hot on the contactor before the n/o contacts to the 240v in the case of a heat pump, thanks!
Good video, and now we all know what you look like... Thanks AC Service Tech.
Ha ha, yeah a face for radio!
Very nice
Thank you. 👍👏🏼👏🏾
hey, thanks, partner for sharing! I love all your videos! I am 48 is it too late to get into the field? thanks.
No, I hear stories from service techs that transitioned into our field and are now on the top of their game. It is just a bit of a financial transition until they became more valuable due to knowledge and skill, doable though, thanks Jimbola77!
wow, nice to see the face to match the voice!
Ha ha, thanks R Aeronca!
I thought the same thing
Thanks King Leonidas!
Ty 👍
Is there any videos on packaged units etc with multiple control boards and their wiring diagrams explained ? Any links appreciated on any type of system
I don't have any videos going over the wiring of multiple control boards in package units, thanks
Thank you. Liking and subscribeing 👍
Thanks for the video =)
@AC Service Tech LLC Is pushing the magnetic contactor manual push bar while power is live a valid/common practice to test the contactor? I see this done quite commonly by the HVAC technicians who visit to fix residential HVAC problems where I live.
thanks for this ...
Thanks Pei Broker!
Great video. Would you recommend replacing a contactor if the terminal was rusted?
They have brass connection points inside the contactor but if the tabs are rusted, certainly you could replace it with a like size one. They are cheap enough, thanks!
Hi I am your fan watching your tutorial most of them. Can I replace 2 pols contactor with coil only one side ( on the top of it ) to regular contactor have coil both side ?
Thank you sir very helpful information
Thanks ejohnfall!
@@acservicetechchannel i worked on package unit today but has shorts cycle every10 or15 minutes what could be the problem please help
If it didn't have any status code lights, you could jump the board out at r to w instead of at the thermostat to take that out of the equation and put your meter on the item you believe is turning the heat off such as pressure switch. If it were a high heat limit switch, you can check the resistance on that after the short cycle because it will still be hot unless time goes by and the blower cools it down. Did you already clean the flame rod and make sure the flame is traveling across the burners well. Outdoor package units are notorious for rusting the burners shut, thanks
Thank you
Also seen a failing coil or bad supply voltage to the contractor cause a chatter with it not fully closing and blowing the low voltage fuse.
Yup the chattering due to low voltage from resistance, thanks for adding that one!
great video. I've narrowed my problem down to what I think is contactor inside a trane air handler, 12 years old Trane 4TEE3F37B1000AA. at this time of year north east, we start heating with aux heat strips and outdoor heat pump cant function. for the first time, I'm hearing machine gun sound at the air handler when the aux heat cycle starts and ends, still getting heat and noise stops once it gets going. Someone mentioned could be corrosion from humidity and ac during the summer, might go away. Any recommendations. I have 20KW 4 x 5KW heating elements, 100A. I think these contactors typically are inside a separate metal box near the heating strips up where the breaker switches are on the front of the air handler if that makes sense? I've changed VS motor module before but haven't been up top where the elements are. All power is off when working on this
Do you have any videos on low amp draw on compressors or diagnosing bad compressor valves ? If not can you make a video go over those things.
Elijah, look up "acservicetech bad compressor valves" thanks
Very good video, got a question can u replace a2 connector with a 1.
Thanks
Thanks
No problem
Audio seems to be better great work
Yeah, did some upgrades, thanks Jonathan!
thank you. well explained clear and logical
Thanks mikeyboy2154!
5:26
Exactly what I had at my job
A contactor was not working and after investigating the coil wasn’t showing a value (1. On the multimeter which means infinity)
But I don’t get something :
The power supply is 3x lines + neutral + ground 380V
Between the lines and the neutral it isn’t equal
It must be 220V but it’s 170~ ish between L3 and N, 250 between L2 and N, 280 between L1 and N
For the contactor what was used is L3 and N for the 220V working supply
But it’s actually 170V that the coil gets
Could it be burned because of that ?
But it’s underpowered so how can the coil burn ?
Anyway this video is really helpful and shows that even a tiny little thing (coil that is used as a switch) can have a lot of issues
ACSERVICETECH, How can you measure the FLA of the contactor? how would a technician know when the contactor has an FLA problem?
I had a breaker tripping to an ac unit today. I killed disconnect and then breaker reset. Found continuity on the 240 wires. Was Thinking I should replace capacitor but now after seeing this I’m thinking maybe contactor too.
It’s a unit on roof could have water or spider webs .
I didn’t check for control voltage on contactor and didn’t have a meter with capacitance with me. But did notice the contactor was pulled in when I did the continuity across is and from line to line also had continuity. Anyways I’m not that good at ac troubleshooting but looking for to trying again when I get some parts
What would cause the contactor to buzz when the cold on thermostat is on but the whole ac system is shut off at breaker? My house isn't cooling down but the fan is working. I'm not positive if the compressor is working or not cuz I can't tell by listening.....but line or pipe that has the insulation on it is dry and not very cool which ik it's supposed to be cold and have maybe some condensation on it. Do you think this would be because of the contactor buzzing thing or maybe it's the dual run capacitor? The capacitor doesn't look like it's bad but I don't have a multimeter to check it and I'm trying to fix this on my own cuz I'm very very tight on money right now. Thank you in advance for your advice
Love your video!
What is the resistance of the coil in the relay? Mine shows 0.000 ohms. Is that normal? It seems like a short to me.
I like to know that. I just bought a new one from Amazon but it's coil got zero ohm. I intend to replace an old one with zero ohm too.
Coil terminals are usually on the sides of contactor, right and left. The resistance of coil should be at least 15 ohms. Low voltage circuit, which is supplied by transformer in air handler inside house, is 24 to 28 volts, and is protected by a 3 or 5 amp fuse. From ohms law, we find that a coil with 15 ohms on a 24 volt circuit will draw 1.6 amps. If coil resistance gets below 5 ohms, fuse will blow.
How about symptoms. Do all of these problems cause failure, buzzing, arcing, etc?
sometimes the little 5 or 10 or 15 amp fuses blows on the circuit board when that coil is bad
Yeah, when it dead shorts together, thanks Blue Collar!
narrow piece of sandpaper works perfectly if you dont have access to a new contactor at the moment.
Hi My Contactor was rinsed by water due to burst pipe. When I turn on the breaker it doesn’t turn it on but when I manually press the Contactor it still works. Do I still need to change this Contactor or I can run with manual pressed?
Electric is my weak point I want to build a practice board. But is there any way to get better at understanding what I'm looking at and figuring out where the problem is?
I installed 3 brand new contactors. All paralleled together for heat tracing loads. Only one of them chatters. Why would a brand new contactor chatter?
what about when you have power on both sides of the contactor even though 24v side has not pulled in the contactor? yes one pole will have power but the other one should not. Internal short? Dead Short? What's the difference between the two?
Your seeing 24 volts on both sides of the coil because the thermostat has contacts have not closed.if you take both wires off the coil you'll find only one wire has power.
Im an electrical apprentice and just ran into a bad pressure switch on my ac unit. I was reading 24v from the t stat through the switch. The coil wouldn’t pull in. I bypassed the switch and it pulled in.
Great video! I understand that you cannot reply to every question but I'd like to give it a shot see if I'm lucky still:). My A/C won't turn on. I checked and replaced the capacitor after finding it's defective. The A/C started running immediately. I left the house and turned the A/C off 2 hours later. A few days later when I turned on the A/C, it started but stopped about 10 minutes later (Not because it's reached the set temperature), then I turned it off. Next day I turned the A/C on to try and it won't start. (The Fan would run when I turned it from "Auto" to "On"). Can you tell what the chance is that the contactor was broken? Thanks!!
Thermostats are delicate creatures, very small manual switchs. Change the thermostat and make sure all connections are tight. Get one that is digital, and when you go out, dont move the switch to off, just set the pushbutton temp set point to a higher temp. Keep it simple.
@@officerkrupke4966 I had the thermostat replaced soon after my last post and it has been working fine since then. Yes, it's the thermostat! Thanks for the reply 🙂
My old contactor is labeled L3 L1 T3 T1 and my new one is labeled L1 L2 T1 T2 how do I know what wires to put where
Hi. 3A fuse inside furnance keeps blowing. Wiring tested ok for shorts. Can the low resistance of the contactor coil blow the fuse? Resistance of my contactor's coil is 15 ohms. Is that too low?
My odd question.....are DP contactors like used in HVAC systems here.....is the mounting orientation important?....can it be flipped upside down/right side up.....such that incoming L connection for line voltage can be either at top or bottom ???......just making sure.
Can you make video on area computation vs size of aircon unit (tonnages) thanks
good suggestion, but there's far more involved in sizing AC and heating than just the square footage. example, R value of insulation, windows, doors, solar gain, exhaust fans/makeup air, appliances, hot tubs, pools(indoor) and there's more yet ;)
I would like to at some point in the future, thanks!
throttle bottle absolutely👍🏽
Another good vid ... Comments the young'uns show that your effort making these are really appreciated ... Good instructor ...
Thanks Eddy!
My blower motor won't shut off when it reaches the right temperature would it hurt for me to spray electrical contact cleaner to see if it might free something up
Btw the cap didn't look like any leak or bulge on it .... but was weird how when the safety on the pan was open and I'd push the contactor in n the condenser would run fan and compressor but when I drained pan and safety float closed n contactor pulled in the fan wouldn't run at all
There could be a 5 minute delay if the outdoor unit had a control board or a delay module, thanks
I have seen spider silk under the contacts multiple times
Yes, often happens!
Still looking for a solution to a Buzzing noise with AC unit off and Contactor contacts retracting properly.
Do u know of any brand that offers contactors that are silent no clicking?
Hey, I've got a 2 pole contactor for a Trane unit that has : 32 FLA 150 LRA , 50 RES but can't seem to find the correct size replacement part. I can find the 30/40 FLA but no 32 FLA. Any advice? Thanks
Go with a higher fla like 40 and that will be good, thanks!
Plunger is closed even with thermostat off so compressor always running, had to pull the fuses to stop it. But as soon as I unplug the low voltage wire (brown) from the side of the contactor the plunger immediately releases to off. Is this a case of bad thermostat?
What`s the name on the ring at the openings of the ironcore?
My contacts wont pull but the hvac guy said it’s because theres no freon in the system, will the contacts not pull do to no refrigerant?
You have the part number to the contractor with the cover please? Common problem down here south Texas.
Hey Robert, here is the 2 pole 40fla- amzn.to/2NZCBxi -the single pole 40fla- amzn.to/2SYOlkp - and electronic contactor- amzn.to/2T3onwa
Do you find Square D contactors to be better than many others? I heard they are made in the U.S., but I would have to pay $38 to get one locally.
Square D is one of the best for sure. They are usually less expensive at electrical supply houses but you would need an account thanks!
@@acservicetechchannel All the electric supply house only had Square D in 120v coils. I wound up getting a Chinese made one Carrier sells for $6.00. I prefer to by U.S. made parts, but $38 was double the price of what that part normally goes for. In addition, the GE breaker I fried was originally made in Connecticut. The new GE one was made in Domincan Republic.
The replacement went well. A 35 yo breaker and 25 yo contactor couldn't take it anymore.
What if the contactor pushes in when it gets 24 v but the fan doesnt turn on, but b4 the safety switch in the pan opened the circuit because the pan was filled w water once the water was drained the float was cutting on and off causing the condenser to go on n off several times when I went back down to the condenser the contactor was pulled in but the fan wasnt turning any more.... cap or contact are suspect , right ??
There could be a 5 minute delay if the outdoor unit had a control board or a delay module, thanks
Would the circuit board cause the contactor to burn up. I have replaced about three contactor on an ac unit, but the only thing I can come up with, that the circuit board is not sending the right voltage or the voltage keeps fluctuating up and down causing the contactor to burn out. Any idea of what it could be. Much appreciated
Check the low voltage supply to the contactor coil. Should be 24 to 28 volts ac. Check the amp draw to the compressor against the name plate rla. Make sure all wire connections are tight, this includes spade terminals on contactor.
Power Bill is very high. AC unit runs when the furnace comes on. I turned the power off going to the AC unit. I keep hearing a buzzing noise that sounds like it could be the contactor coil making the noise and why? What is happening?
Man I rewired/rewound the coil 3 times on mine, filed those contacts so nice & pretty but I keep getting this horrible buzz. The dual cap is new, I've tried 3. I tried 4 different relays. I hard wired the main power wires in with industrial connectors. I got the right amount of r22. Some dildo jacked my dual cap & we didn't know it, turned it on & it arched. After I replaced the cap it worked fine for a day but the buzz came. Then I looked & the wires were melted around the connectors on the dual cap & the relay was spaking. The fan runs fine, the compressor runs if you remove the contractor all together & drill 2 holes on either side of a old 1950s industrial fuse(yeah we're in wv & poor but have lots of weird stuff & strange dangerous ideas lol) Anyway the thermostat & everything in the cellar is fine. It's getting 24v but something is up with the contactor even though it closes perfectly fine with very little resistance when taken off & hit with 24v. ..I know you get stupid questions all the time & it sux because some sound ridiculous & I'm sure mine is up there but we really don't have the loot, we just bought a apt & have been remodeling it & the house, it's old but because it's r22 it's going to cost a fortune to take the next step. More than a old lennox is worth. Any idea what could cause the problem?
Why if your reading high mega ohms on the contactor it should be replaced? sorry I didn't understand that part from an electrical perspective.
Because the resistance is going to limit the amount of current that can pass thru the contacts.
My fuse keep on blowing. Next gave me E103 - over current on y1 error and I was able to change the contact. It worked one hour before same error . I put the ok’d thermostat and now it blow my fuse each time I turn it on. What can I do.
Just tell us the top 5 issues..I'm in the field!
I made the video for students in the HVACR classroom so that is why I go into more detail, thanks!
@@acservicetechchannel That sounds like a tech who does not want newbies getting into this field :))))) Thanks for wonderfull explanations
Super tech
Thanks Running Coyote!
a few years ago unit had ant pile in front of unit and they were up in contacts so i just cleaned contacts and got it running and told them to take care of there ant problem. he called me to his house 3 times that summer for same problem, Should we take care of there ant problem lol.
Ha ha, yeah in those circumstances we usually just replace the contactor with an enclosed one or electronic one like emerson puts out, thanks
nothing wrong with contactor but i charged him each time you think he would get the hint
@@acservicetechchannel
@@bernieclement3373 Money in your pocket, but Karma will be harsh. The guy did NOT get it, that is why he is calling you. It would be kind of you to tell the guy to kill the ants to prevent repeat. Also, the guy will hate you for having to call you back 2 more times. Short term gain....long term loss.
Weird question but what’s the point of having these contactors, and if we get one that goes bad and we don’t have the replacement part but still need to keep equipment running can we just bypass “Hotwire” it or will a meltdown happen? Thx
Not weird brudda. Relays allow us to control higher voltage with lower voltage. Imho these contractors allow our 24v thermostat control the outside condenser [in this context] which uses higher voltage to operate.
Can you hot wire in an emergency? Why not. Be safe, isolate and get the new contactor asap. I'm guessing you would use the service disconnect to shut off the unit in this emergency?