Air Handler Control Board Operation and Troubleshooting!

[@acservicetechchannel]

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[@jericosha2842]

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

[@acservicetechchannel]

Thats awesome to hear!

[@refrigerationtechnology7858]

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

[@rhoodj]

I think I have a bad relay on my Condenser fan citcuit board. When the fan stops spinning when I touch the circuit board the fan starts and I can hear the cranking noise stop/start on one of those black relays. How to replace this circuit board? Any help please?

[@acelookrenos611]

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

[@acservicetechchannel]

Thanks a lot and glad to do it!

[@boeing757pilot]

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.

[@Earthcitizen4609]

Best hvac channel

[@davidjones5269]

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

[@hectorm.flores3252]

Thank you so much bro.God bless you always

[@YTsux24-7]

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

[@acservicetechchannel]

Thanks a lot Tom! I appreciate you and let me know if you have any questions!

[@bradmironik6137]

Another good video craig. Thanks for sharing your knowledge.

[@acservicetechchannel]

Glad to help Brad!

[@TRICKAIRCONDCHANNEL]

Nice troubleshooting sir 👍

[@acservicetechchannel]

Thanks a lot Trick!

[@marlos3192]

Greatly done, enjoyed the video!

[@SombraLocs]

Your videos are the best!

[@acservicetechchannel]

Thanks a lot Familia Sanchez HVAC! Nice to hear from you!!!

[@hvacjohnnie]

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

[@acservicetechchannel]

Thanks a lot Up and Coming HVAC Johnnie!

[@Eddy63]

Another good 1 Craig ...

[@acservicetechchannel]

Thanks a lot Eddy!

[@johndoe-wt4ui]

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

[@acservicetechchannel]

Ha ha, thanks and glad to help!

[@zekenzy6486]

Great video. Happy Weekend ^_^

[@acservicetechchannel]

Thank you very much ZE KENZY. It was productive!

[@marcoselgaucho1106]

Your the man!!

[@NDavis-fs9wm]

great teaching.

[@acservicetechchannel]

Thanks a lot N Davis!

[@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

[@acservicetechchannel]

Thank you for your support and watching the videos!!

[@paulsantora4054]

Excellent video.Thank you!

[@acservicetechchannel]

Thanks Paul!

[@rickreeder3190]

Excellent video.

[@acservicetechchannel]

Thanks Rick!

[@toupsclassroomtoupsclassro9557]

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

[@spartan5106]

Good content

[@clevc112]

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

[@boeing757pilot]

Maybe. The old timing circuits used a resistor and capacitor in series to set the delay. The capacitor discharged through the resistor. The higher value resistor created more of a delay. Now, many boards have a programmable logic module to handle this function...

[@GerryMetrillo]

Good Stuff!

[@acservicetechchannel]

Thanks Gerry!

[@toupsclassroomtoupsclassro9557]

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

[@shieldcracker]

Craig what is the purpose of the time delays for turning on & off the fan?

[@chriscermak3188]

Great video Craig. So this the type of board you would encounter on a straight cooling A/H as opposed to the board on a furnace?

[@acservicetechchannel]

Yes, newer furnaces have an IFC which is an Integrated Furnace Control board. That controls ignition and the blower. The board in the video can also be referred to as an EFT, Electronic Fan Timer, thanks!

[@michaelcostello6991]

Thanks

[@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?

[@rickandersen8632]

I’ve had two of these control boards catch fire and the relay melted. Is there any recall for this problem & can I use an off board relay that would be safer?

[@l.crossjr]

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

[@acservicetechchannel]

Thank you for letting me know what you would like to see!

[@craigewing1844]

I would like to thank you for all your help in making these videos! You have help me tremendously! I also would like to see some troubleshooting on some RTU units up to 25 tons. Thanks!!

[@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.

[@HolyElkGaming]

Thanks!

[@acservicetechchannel]

Thanks!

[@HsingSun]

Thank you very much for your video. I don't have a control-board, but I do have solid-stat time-delay. My ac system keeps running and cannot be turned off. I replaced a new time-delay, but it has the same problem. What caused the problem, please, help.?

[@abdalqadr1]

Good

[@xtremecomfort7799]

Thanks!!!!!!!

[@acservicetechchannel]

Glad to help!

[@BKMDano17]

I'm assuming that the relay can be changed if it does not pass. What type be of problem would be encountered that would point to the board/ relay?

[@acservicetechchannel]

That relay is actually soldered to the board so you would replace that one. It is not a plug in type. If the blower runs all the time or the blower does not come on at all, thanks!

[@enriqueayalajr4597]

Will this cause my compressor to shut off? I've got a heat pump that I'm trying to get working again. Lightning cooked the defrost board, contactor, transformer and condenser fan motor. The compressor is giving a good resistance value

[@toupsclassroomtoupsclassro9557]

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?

[@kurtamiss]

I have an air handler in which the fan runs when the ac is When the heat setting is on the fan doesn’t work on auto or When I go to the cool setting the fan comes right on as

[@jhonb6768]

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

[@hammerbeard3357]

Yeah videos like this are great but working on a table and in a unit are vastly different.

i discovered the board fuse blown and the blower relay completely fried.(melted) what would cause that? (goodman handler

[@matty6848]

Very good video in fault finding etc. Unfortunately we seem to live in a more disposable environment today where HVAC techs just willingly throw away & order a new PCB, which in turn kills skills you easily forget. In my apprenticeship 20 years ago I remember being taught to sit & fault find. Now it’s just a rip everything out and replace society as parts are so cheap, which is good in it saves you time, but you quickly lose your knowledge.

[@AN-ce1nd]

My particular board doesn’t turn off. In other words once it gets energized the time delay for off function does not occur. I could probably fix the board but I don’t have a schematic. It was like $18 shipped. My guess it’s the IC chip.

[@Holydany]

Can someone explain me why the air handler need a time delay ? it is because you dont want your motor fan doing On and Off constantly ? and not because you want to extract all of the heated air in your duct

[@Iglesiadedios7obreros]

what is the name of the motherboard, and can you send me a diagram of the connection to the thermostat I would appreciate it!

[@preachershaker]

I can't locate a control bd or a fuse on my furnace.

[@JoseHernandez-vr3kh]

How much is the cost of The control board?

[@HsingSun]

I have not seen he could answer any question as I expected. He may give your the part number, the price would depend on the model.