Air Handler Control Board Operation and Troubleshooting!

In this HVAC Training Video, I Show How a Basic Air Handler Control Board Works and How to Diagnose a Problem. I show the Electrical Connections, the Voltage Path, and Troubleshooting Using a Multimeter. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.

Tools Used In The Video

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our Related Videos/Articles

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our HVACR Educational Books, E-Books, Workbooks, Cards, Posters, and PowerPoints:

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our HVACR Online Resources!

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Tools Used in Our Videos!

Support the Channel by purchasing tools through TruTech Tools!
Save 8% at checkout using code "acservicetech"
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Follow Us On Our Social Media & Podcasting Channels!

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
⚠️ 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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #controlboard #airhandler #controlboard #troubleshooting #voltage
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal.

[acservicetechchannel]

Related Videos:


Tools I Use Are Linked Below!

Leak Detection:

Vacuum Tools:

Checking the Charge:

Flaring Tools:

Swaging Tools:

Brazing Tools:


Electrical Diagnosis Tools:

Nitrogen:

Service Valve & Port Access:

Other tool links can be found in the video description section.

[jericosha]

Your videos are addicting. The more you teach me, the more I enjoy it, and then I want to learn more.

[refrigerationtechnology]

People think residential is basic, no you learn fundamentals
Thanks for the vids Craig

[davidjones]

Retired after close to forty years. Never thought I would say this but damn I miss this work

[acelookrenos]

This is one of the best videos I was really waiting for. Appreciate appreciate. More technical and much needed.

[boeingpilot]

Thank you. What I've noticed about all fan boards and all other HVAC boards is that they share 3 functions: input, logic (or process), and output. Thus, one (or more signals) is sent to the input(s), the board processes the inputs, and then sends an output--like a relay closure.. Thus, the troubleshooting process is always manipulating inputs and verifying that the output responds as expected.

[hvacjohnnie]

It couldn’t be much clearer. Your breakdown are in 4K. Nice

[YTsux-]

Good morning Craig! I need to catch up on your videos as I've missed a few. Great info sir as always!

[hectorm.flores]

Thank you so much bro.God bless you always

[johndoe-wtui]

Thank you sir you are the best thing since slice bread 🍞

[clevc]

I believe the delay turning off is from those capacitors once they drain.

[bradmironik]

Another good video craig. Thanks for sharing your knowledge.

[bryantylerservices]

Great demonstration on this video, Craig..
Very informative and useful to diagnose a air handler circuit board.!
Thank you for your time and all your efforr you put into these videos!
Bryan Tyler Refrigeration

[toupsclassroomtoupsclassro]

Love your videos, but for the lay person, to cut power then disconnect the wires from the relay, then turn on the power again with wires to relay disconnected, would like to see you jump the red and green wire from the inside of the wire covers at terminal? is that what would be done. Really good video and I do thank you

[toupsclassroomtoupsclassro]

Summary: Pls tell me if I'm wrong. 1. shut pwr off at air handler. 2. remove wires to relay and tape them away from board and each other. 3. test C and NO to see if no resistance same with C and NC for resistance. 4. Run a jumper wire from R to G test for resistance and level at said terminals. 5. is the relay good and operating as designed. Did I miss anything?

[l.crossjr]

Any videos on troubleshooting rooftop units? I really like the way you explain. Thanks

[toupsclassroomtoupsclassro]

Question: on one video you said you made the transformer tester the one in this video. I understand all you have done here, testing the relay that operates the blower motor, but is the tester so that you can totally cut the power in the airhandler to make it safe with low voltage? thanking you in advance

[ranimouf]

Hi. I have a control board that doesn't have a fuse. Can you do a video on how to add an inline fuse to protect the control board. I am sick of replacing these boards which are getting very expensive. Thank you.

[MrBritrider]

Is there a way to isolate my air handlers control board from getting too much moisture in my crawlspace? I’ve had to replace two, one 4 years after it was installed and another a year later. Tech showed me the latest failed control board and it had lots of white powdery substance around a few terminals. Looking for a quick hack until I can afford to purchase a dehumidifier. These control boards are not cheap.
Could I put it in a plastic zip lock bag?

[jhonb]

Thanks, but I would like to have seen where the control board was and how to get at it