Outdoor AC Unit Not Running, Not Turning On! Top 10 Problems!

In this HVAC Training Video, I show the Troubleshooting of an Outdoor Condensing Unit for Air Conditioning. I go over 10 possible problems that could occur that may not allow the outdoor AC unit to turn on. I use a multimeter to diagnose each problem and show where to take measurements. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.

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⚠️ Disclaimer:
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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[christaylor]

THANK YOU. Our AC stopped working recently and we had a despicable "repairman" come out and tell us that our furnace control board was likely bad, and then try to price us out a whole new system for $13k. Using this video I learned what I needed to know to determine that I just needed to reset the low pressure switch. Fixed my AC for zero dollars. Very much appreciated!

[petiwalas]

One of the best videos for diagnosing AC issues. If this company was in my area, I would surely bring him to get my new AC/HVAC system installed!

[donaldharp]

Craig, Just wanted to tell you how much I appreciate this video. As a home owner and a System Engineer, I hate to have a service tech come out just to bill me for something I can fix myself. Took less than five minute to troubleshoot the fault and less than 20 to replace the thermostat control wire. you are time and money saver. God bless and thank you for sharing your knowledge!

[Geemoo]

Craig, My AC went down and we are starting a 100+ degree heatwave. I followed this video and found a bloated capacitor. Ran down to Grainger and bought a new one for 20 bucks (could have got one for $12 but I bought a good one)! Had it back up in a hour. You saved me You're the Man!!! Thank you!!!!

[nicolasbouyiouclis]

Craig, this is the most analytical and the most comprehensive video I've ever watched and I thank you very much for it.

[chadg]

Man. I did so much searching a couple years ago to put together all this info for myself. What a helpful video. Following this will troubleshoot 90% of problems you can easily fix yourself. Outside of these, it's time to call a repairman in my opinion. Great video. Kudos. Wish I found this back when I needed it!

[jackpast]

Really nice, Craig. Years ago, in Florida, I had an in-line condensate switch in my pvc pipe that used gravity to get rid of condensate. It had a p-trap in it and the switch was mounted there. We were in the home for about a half-hour when I realized it was a little stuffy in the home. I went to the thermostat and saw it was blank. Ugh. Luckily I had some tools and an electrical meter there. Using the schematic on the inside panel, I discovered it was the condensate switch opening up the power. The piping had shifted and wasn’t draining properly. Long story longer, knowing the things you teach here really makes you the hero when the chips are down! And the temperature is up.

[glentaybow]

Clear, concise, understandable instruction. No "Uh's" or "ah's" in the final product. Kudos. I think so many people see youtube videos as something anyone can do. Well, anyone can, but there's so much difference in quality and presentation of content. The majority of these videos are trash in my opinion....a distraction in my quest for good quality content. So, hats off my friend in producing a truly high quality video to help folks who just need a little basic information to remedy a problem.

[Star]

Thank you for the in-depth diagnostics guide, as opposed to just telling us to call a repairman. Being able to do basic troubleshooting on your home utilities is practical and can save a ton of money.

[vieuxacadian]

HVACR / Cryo Tech for 36 years and I enjoy Your videos .

[sywvmcb]

24 degrees outside. Come home from a weeks vacation and no heat. House is 40 degrees! Watched your video. Cleaned contacts on outside disconnect and Voila!!! Thank you soooo much!! Michael Paxton

[charlesforte]

THE MOST INFORMATIVE HVAC TROUBLESHOOTING VIDEO EVER ! Thank you sir !!! 👍👍👍

[justinberrett]

Excellent video. You covered several problems spot on. You do a great job! I can’t imagine why anyone gives you thumb down. Please keep teaching us. Thanks

[edgarvilla]

Craig, thank you for putting this video together. I was able to quickly use my voltmeter and troubleshoot the problem and got it fixed.
I still had a tech check the work and he said it would have cost you $580.00 for the contactor install. I only paid for parts and service call for 200.00. I enjoyed getting to know a little about hvac. I feel proud of fixing the unit with confidence, confidence you gave me with this video.
Thanks!!

[cliffhelmey]

Man you are a lifesaver. I wasn’t getting the 24 volts combo from the indoor unit.
Turns out the float was stuck to the flood pan.
Amazing job…. Thank you again

[erics]

Thanks to you I was able to identify the issue was the capacitor.replaced it and worked! Thank

[mosulttani]

Thank you so much for all your videos. you saved me a system replacement and it was only a contactor issue. I managed to clean/sand the burned surface to make it work again until I get the replacement part. Great video. Thanks again.

[ridgep]

I'm sold on your knowledge! I ordered your books.My only source for hvac info.My main interest is charging correctly, not by guessing with pressure alone.Thanks very much!

[tazmaniandevil]

So glad I seen your video before I just started throwing parts at my air conditioner. The contactor was dirty, cleaned it off and it's working now. Going to buy a new one and replace it tomorrow. Thank you so much.

[UKnowItsTrue]

Awesome video, our upstairs unit was not cooling, air handler was running but outside unit not running. After checking the breakers and thermostat settings I had relinquished myself to having to call a HVAC guy on the weekend. Watched the video and was reminded that my unit has a condensate pump in the utility room on the first floor, sure enough it was unplugged, as soon as I plugged it up, it ran( reservoir was full of water) then the outside unit started running once it pumped out the reservoir. Thanks for providing an excellent video and saving me an emergency service call.