Troubleshooting Bad Contactor Coil

David explains how to troubleshoot a bad contactor coil.
Thanks for watching!
David
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[@jciam5135]

You are the most detailed HVAC person on here, not to mention the video is good as well. I will be following you as i like to do my own repairs on most things. I'm actually thinking of taking up ac/heating as a new career. thank you

[@Al-Fiallos]

Excellent presentation and material. As a homeowner, it helps to understand what is involved for a central unit to function. It helps one to understand what the service technician is telling you about your unit. Thank you.

[@jeconiaA]

It always took me time to realize a faulty contactor til i found your tutorials.Thank you

[@ShawnWynn]

Awesome. Saved me a repair bill and service call. $39 for replacement, piece of cake. THANKS

[@DavidMalin]

You just saved me a call for the Repair Tech. That was an easy test and swap out. The only issue is Home Depot and Lowes don't keep these parts on hand. But, so far I swapped out one from my neighbor who had a spare. My coil was only reading 2 ohms. It was causing my 3 amp fuse on my control board to blow. I did the test as you said and sure enough it was bad. My A/C is working again.....thanks!

[@brianorear908]

OL....open lead, open line, open loop etc... so many commenting that they know exactly what it means, haha.. Regardless, this video saved me over 2 hundred bucks because I was able to determine that my contactor was bad, now my unit works great...who cares what OL stands for

[@BronxGummer]

I love the Bent Thumb - especially at 4:37

[@kurchak]

This was incredibly helpful, thank you! My coil is coming in at 2 ohms, which would explain why my AC blows the control board fuse every time I call for cool. Thanks!

[@bluecollarmillionaire4life]

Thanks for complement. Glad it helped

[@bluecollarmillionaire4life]

Some times they still look new, and if you are blowing the indoor transformer that's when you need to know. Other than that most of the time if you have 24 volts and its not pulling just replace it. Thanks for the question.

[@kevinh3634]

awesome video. great detail help me out and learn a lot. thanks you keep up the great work

[@lioclerc72]

I am a student at apex training center in miami. I love your video

[@shlomoshekelman85]

Thank you for the video! Yes mine is definitely bad 👎.

[@bluecollarmillionaire4life]

Thanks I hope it helped.

[@keithhoward8651]

Great video,thanks for the help. Looking forward to more.

[@JMF2479]

Great video and very detailed . Helped me out so much.

[@bluecollarmillionaire4life]

I am glad it helped.

[@alejandrojaimes6250]

Thank you very much for your tutorial David !!

[@bluecollarmillionaire4life]

Yes, sounds like you may have a bad thermostat? Make sure you have a good 24 volts leaving the red and yellow from the thermostat. Hope this helps. Thanks for watching. Let me know if this helped .

[@thecreaturesdancedlikeus3922]

Thanks for passing on the knowledge!

[@jcl5410]

I've been trying to diagnose problem with my spa (hot tub) which was not heating. After ruling out a bunch of other things (like the heating element) I got to the contactor. I pulled it out and measured the resistance across the coil and it was over 200 ohms. I figured I had found the problem. I ordered the same type of contactor as a replacement. It just arrived. Before installing it, I measured the resistance and got 234 ohms (doesn't jump around). I just remeasured the first one and it jumps around a little, but is generally between 234 and 237. I will see when I get around to installing the new one if the contractor was actually the problem, but it seems that the 9-12 ohm resistance guideline that you talk about in the video must be for a specific type of contactor - and not the type I have. The model# of the one I pulled is CR453CA2AAA.

[@tomnugent2148]

Resistance varies with different contactors,new ones can be up to 20 ohms and are fine.as far as needing more main voltage on the main voltage to make the contactor work thats ridiculous.the 24v from the transformer pulls in the contactor, not the high voltage leg.you can disconnect the high voltage and the contactor will still close.dont spread inaccurate info.

[@bluecollarmillionaire4life]

I hope you find this video helpful...thanks for watching from Jones Air Conditioning & Electric in Naples, FL!

[@slshanklin]

Just fyi, O.L. in ohm setting means open line. It's over load in volts and amps...

[@tonybryant9267]

Very informative video. Thanks

[@nickresa7554]

Very thorough... thank you.

[@bluecollarmillionaire4life]

Your welcome

[@bluecollarmillionaire4life]

It is weak it should be replaced. Thanks for asking.

[@lakotapride7370]

Thank you thank you 🙏 Great 👍 information

[@aamirghanchi9487]

I have a contactor showing less than 1 ohm on the coil. Should I replace it? The fuse in the air handler is also blown.

[@jimrichardson729]

Erradical.....word of the day! 😆

[@panman1224]

Fantastic! thank you.

[@andrewbarker939]

good instruction, thanks

[@condor5635]

Great video and enjoyed learning new things but i just got home from parts store and checked the ohms on my brand new Supco contactor and it is 16 ohms which according to your video would be a bad one. Is 16 ohms really not acceptable right out of the box? Can't imagine this being bad. Using a Fluke 85V so sure it is not the meter. Thanks

[@spydrsct]

Connector doesn't always pull in. I turn breakers off to heat pump and condenser unit, wait a minute, turn back on and the the connector will pull in, 240 from main power and 24 from indoor thermostat. When it's not pulling in, 240 is being supplied, but nothing is coming in from thermostat. I check the ohms in both cases while. Pulled in it, it goes in the negative. Not pulled in, it doesn't register anything. Do I need to disconnect it to test ohms?

[@ml5323]

every time i connect my condensing unit to my furnace board. It fries the board within 24 hours.... ODD right? My contactor across the 24v legs are measuring 17.7ohms.... is this too high and causing too much current to fry my furnace board? I've already been through 2 boards... SMH

[@bambarhan]

Hi guys. I measured contactor coil that was 33 ohms, it is bad for AC110V? How many ohms should have for AC110V? Thanks.

[@williamaquino8547]

Hello, My break use trip one a week and then 3 times a day. I check my power cable at the panel, the cable was warm so I replaced for a bigger wire. Everything was working without any problem for 10 hours. Now the breaker trip automatic. Any idea??

[@himanshuparikh8399]

i have 2 outdoor units. one does not start the fan/compressor. I swapped the capacitor and contactor from the good one and it did not fix the problem. conversely, the good one continued to work. i do see 24V coming in when thermostat is triggered. I'm lost...the unit is from Rheem (model # RANL 048-JAZ). any ideas?

[@hvacmike1175]

I HAVE 12 NEW IN THE BOX 24 VOLT COIL CONTACTORS ON MY SERVICE TRUCK. I CHECKED THE COILS. THEY ALL ARE BETWEEN 14 TO 17 OHMS, [ I USED TWO METERS TO CROSS REFERENCE] USING YOUR TEST WOULD MEAN THEY ARE ALL BAD. WHERE DID YOU GET YOUR DATA ON RESISTANCE FOR THE COILS.

[@richkline5087]

I do HVAC work and normally go by between 9 and 20 OHMS for the High Voltage Side of the contactor and find them to be good

[@jmborde]

thanks for the video!

[@bluecollarmillionaire4life]

All low voltage is disconnected to heat pump? If so look at high voltage wiring, sounds like has someone has been there before you?? Let me know if this helps?

[@Astrojamus]

does low voltage need to be disconnected to check ohms?

[@pistilliproductions2930]

i was wondering, if you have 24va to the contactor and its not puling in why bother to ohm it...i .mean in what scenario is this nessesary

[@bluecollarmillionaire4life]

Make sure you have 240 volts? Double check for 24 volts. Make all wires are connected. Try this if this does not work call me. Thanks

[@bluecollarmillionaire4life]

Thank you

[@bluecollarmillionaire4life]

Then the coil will not pull in. Thanks for asking

[@tyronewilliams0004]

Mr. David I have a question for u. U have been my teacher for awhile now. I have learned so much from. Matter of fact I learned more from u than 2 years of school. I was told I should read between 10 and 20 ohms on my contactor im trying to separate opinion from fact please help. U said toss it if its over 12 ohms.

[@mikeraia2605]

tyronewilliams0004 i thought the same thing, but most read netween 9 and 12, i had one yesterday reading 19 ohms ,

[@larrystadnyk5439]

Yes all low voltage disconnected. what should i be looking for in the high voltage wires

[@jjones2091]

My contactor has an issue, of not coming on automatically. Now when I press down on it, it gets power. I have been told that it is an issue on the inside. My gut tells me it is just the contactor that is the issue. Who is right most likely? Thanks

[@hasi812]

mr David the inf of the ohms comes in contactor sticker?

[@richkline5087]

Can you just check for continuity? You stated continuity in the video but I do it by the BEEP for continuity and you were actually checking for OHMS. I touch each side of the leg and set my multi meter to OHMS and Continuity (BEEP). If no BEEP then no Continuity, then I deem it BAD

[@bluecollarmillionaire4life]

Because something's is causing it to run? Check your wiring schematic For unit mis wire. Sounds like line and load are crossed?? Keep me informed,

[@SenthilKumar-or3oj]

Contactor coil continuity come or not

[@1jckinnick]

I thought it was supposed to read infinite resistance? What is an infinite resistance reading anyhow? OL?

[@richkline5087]

I was taught that OL is Open Lead

[@1jckinnick]

I thought it might have been over load

[@lockedasian]

david my contactor's coil is reading at 4 ohms. is it bad?

[@mikeraia2605]

Mar yes

[@larrystadnyk5439]

24 volts from air handler disconnected. Turn breaker on outside condenser and it will run uuntil i turn breaker off. replaced cap and contactor. What could be the problem.

[@leandropereira2218]

compressor

[@bluecollarmillionaire4life]

Did you check to see if you had 24 volts?

[@richkline5087]

Pretty sure OL is not overload and is Open Lead, just saying

[@armandom.5299]

Psssst........yo my man......OL stands for Open Line....not Over Load......✌

[@lorekinfai]

I tot it is called "open loop"

[@mexicant777]

Open loop

[@jonbass5223]

lol, ol means open loop not over load,

[@potter40]

Mmmkay

[@kaydee457]

LoL, be careful sir for the assumptions you make in this video tell me that you don't know what you're talking about in at least some of the cases.......

[@roberthedger1036]

Wow. This guy is a joke. To a bunch of homeowners he might sound like he knows something. "The line side goes to the compressor and fan" "18 volts is too high resistance across the coil"????? Really guy?????? You have no business making a video about this. SMH.

[@wafathamer8971]

Thank you

[@enosem1]

Plz help i have burnt 2 contactors , when i installed the last one the contactor didnt work because a wire wasn't comnected inside but the compressor would turn on when i push the test and it worked fine. When i put the wire on the thermostat wited turned on the compressor but it chattered and the compressor turned on and off. Why