HVAC Control Board Operation for Troubleshooting!

In this HVAC Training Video, I Explain how an HVAC Control Board Works and things to check for if you think it's Bad. I go over the Sequence of Operation, and how these three boards differ. I show the IFC Integrated Furnace Control, the EFT Electronic Fan Timer, and the Ignition Module. Control Boards are found in Furnaces, Boilers, Air Handlers, and all other types of units. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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Our Related Videos/Articles
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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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #controlboard #hvacboard #sequence #operation #EFT #fantimer
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[@acservicetechchannel]

The E-Book, Paperback and Quick Cards: www.acservicetech.com/store The Paperback, Quick Cards at Amazon: www.amazon.com/shop/acservicetech Support the Channel- www.patreon.com/acservicetech Tool List- www.amazon.com/shop/acservicetech Related Videos: Gas Furnace Ignition Control Modules! kzbin.info/www/bejne/inLFnKFqfdKZj6M Gas Furnace Spark Ignition Control Troubleshooting- Two Rod! kzbin.info/www/bejne/moaplImAja9rjMk Gas Furnace Spark Ignition Control Troubleshooting! kzbin.info/www/bejne/fX-8lYJ_q7ysr80 Troubleshooting the Furnace Control Board IFC to Test if its BAD! For Heat and AC Diagnosis! kzbin.info/www/bejne/ppnWhoyupJxooLc Air Handler Control Board Operation and Troubleshooting! kzbin.info/www/bejne/inbOZWuqjsp8acU Furnace and AC Fan Not Working! Troubleshoot the Fan Control kzbin.info/www/bejne/a2a3kKuhbtmKjqM How this Defrost Control Board Works, Heat Pump Wiring for Defrost Cycle! kzbin.info/www/bejne/f3jWeJeFiLqrg7c DEFROST Control Board Wire Terminal Functions! Heat Pump Defrost Cycle Explaination! kzbin.info/www/bejne/qYuwdn2vjatgrsk Furnace Flame Sensor Testing and Flame Rectification Troubleshooting! kzbin.info/www/bejne/gqXJmJuLjsufY5Y Tools I Use Are Linked Below! Leak Detection: Accutrak VPE Ultrasonic Leak Detector amzn.to/2nFYKVe Accutrak VPE-GN Ultrasonic Leak Detector amzn.to/2Zy4IZP RectorSeal Bubble Gas Leak Detector - amzn.to/2ckWACn Vacuum Tools: JB 6 CFM Vacuum Pump - amzn.to/2nqbvo8 CPS 4 CFM Vacuum Pump - amzn.to/2DxgPwY Appion Valve Core Removal Tool - amzn.to/2uYr8WL Appion Blue 3/8" to 1/4" Vacuum Hose - amzn.to/2uYlVyc Appion Red 3/8" to 1/4" Vacuum Hose - amzn.to/2uYg6Ro Yellow Jacket 1/4" by 1/4" 3’ hose - amzn.to/2umtcod Appion 1/4" by 1/4" and 3/8” hose - amzn.to/2Zyxzx9 Uniweld 1/4" by 1/4" 2’ hose - amzn.to/2GFov1Y CPS Vacuum Micron Gauge - amzn.to/2v1nM3O Supco Vacuum Micron Gauge - amzn.to/2v1JRiA JB Vacuum Pump Oil - amzn.to/2mGrlXy Checking the Charge: Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9 Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq Digital Refrigerant Scale amzn.to/2b9oXYl Ratcheting Service Wrench amzn.to/2dGV4Nh Fieldpiece SMAN380 Digital Manifold Set amzn.to/3297zse Fieldpiece SMAN480 Digital Manifold Set amzn.to/337mGnq Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8 QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3 Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ Flaring Tools: Yellow Jacket Flaring Tool - amzn.to/2OBxGlM Spin Flaring Bits 1/4", 3/8", 1/2", 5/8", 3/4"- amzn.to/31BCs8Z Yellow Jacket Flaring Tool with Set Depth - amzn.to/2QIKsQH Yellow Jacket Torque Wrench - amzn.to/2NRR68Q Uniweld Swage and Flare Kit- amzn.to/2T55jyn Nylog - amzn.to/2MLJcch Ridgid Tubing Cutter - amzn.to/2DnjjR1 Wolverine Tube Reamer - amzn.to/2QGLyMV Swaging Tools: Manual Copper Tube Swage/Expander- amzn.to/2WRPa1M Spin Swaging Bits 1/4" to 7/8" for the Drill- amzn.to/2YQwwqS Uniweld Hydraulic Swaging Tool- amzn.to/2MlrI8m Uniweld Swage and Flare Kit- amzn.to/2T55jyn Uniweld Hammer Swage kit- amzn.to/2CzWMMU Uniweld 3/4" Hammer Swage- amzn.to/2CzXsSs Uniweld 7/8" Hammer Swage- amzn.to/2Mja5WE Uniweld Multi-Size Hammer Swage- amzn.to/2T3Cx1b Brazing Tools: Air Acetylene Torch setup - amzn.to/2aQalsb 15% Silver Brazing Rods - amzn.to/2gVLyLc Uniweld Cap-N-Hook and #2 Tip Oxy Acetylene Torch Setup - amzn.to/2STp3Fe Ameriflame Oxy Acetylene Torch Setup #1 &#2 Tip - amzn.to/2SRm3JF #2 Tip for Oxy Acetylene Torch - amzn.to/2SPDaeD Cap-N-Hook Tip for Oxy Acetylene Setup - amzn.to/2MbhpUk 40cu B Tank to 10cu MC Tank Acetylene Tank Fitting - amzn.to/2GxZZPi Nitrogen Regulator - amzn.to/2bXdR5f Uniweld NitroVue Flow Regulator - amzn.to/2GnsaAo Uniweld Nitrogen Flow Meter - amzn.to/2brvoBg Bernzomatic Trigger Start Lighter Propane/Mapp Gas - amzn.to/2vit0cv Uniweld Soft Flame Sweating Torch Setup for Acetylene - amzn.to/2DyzRD8 Flint Spark Ignitor - amzn.to/2L3P2u9 Stay Brite #8 Silver Bearing Solder and Flux - amzn.to/2XIDJsY Aluminum Braze Rods - amzn.to/2IGNMu Electrical Diagnosis Tools: UEI DL389 Multimeter amzn.to/2xAdaJf UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Magnet Jumpers- amzn.to/2PyKPQZ Alligator Jumpers- amzn.to/2PxqJXn Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V Nitrogen: Uniweld NitroVue Flow Regulator- amzn.to/2GnsaAo Uniweld Nitrogen Flow Meter amzn.to/2brvoBg Nitrogen Regulator amzn.to/2bXdR5f Service Valve & Port Access: RectorSeal Bubble Gas Leak Detector - amzn.to/2ckWACn 25 Valve Cores - amzn.to/2L37UJU 25 ¼” Brass Port Caps with rubber O-rings - amzn.to/2GIOdD2 Brass Valve Core Tool which holds 3 valve cores - amzn.to/2GFEbm2 Valve Core Torque Wrench - amzn.to/2GHiLoD Locking Cap Universal Lock/Unlock Tool - amzn.to/2GGAoVp Locking caps - amzn.to/2GFXZ8A Ratcheting Service Wrench amzn.to/2dGV4Nh Yellow Jacket Sealright 90 Coupler- amzn.to/2LsU1V7 Yellow Jacket 1pk Compact Ball Valve- amzn.to/2uXdF18 Yellow Jacket 3pk Compact Ball Valve- amzn.to/2AiKfQe Thumb Screw Valve Core Depressor with Backseat- amzn.to/2mR0sCL Other tool links can be found in the video description section. 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- www.amazon.com/shop/acservicetech

[@francoissmith7710]

Thanks much for your insight and for expanding my knowledge through your videos. I’ve been experiencing a communication error on a 24k btu Panasonic inverter can’t seem to find what’s causing the problem some help please

[@BillPf1961]

Always Great videos. Listening to a podcast a while back, they shared an acronym for the sequence of an Integrated Furnace Control and it went like this "Take It Slow Its Gonna Blow" , "T" is Thermostat , "I" is Inducer Motor , "S" is Safety (Pressure Switch) , "I" is Ignition , "G" is Gas , and finally "B" is Blower Motor" Hope it helps !

[@acservicetechchannel]

Absolutely, thanks William!

[@AR-pj2wt]

Beyond thankful to find your page. Your content is such a blessing. I’ve already subscribed some time ago and I just purchased your work book, textbook and reference cards off of amazon yesterday. Can’t wait to dive in. Blessings to you and yours & all you set your heart to do!🙏🏾

[@Sconda75]

Licensed tech but haven't been in the field much for a few years. This is a great refresher for me and us exactly what I was looking for. THANK YOU

[@MarkHarrisburg-ky8zo]

Can you help me with the 608 test

[@robertmoules6699]

Love your videos. I sometimes use them in the field just to refresh. Thanks for all u do

[@acservicetechchannel]

Awesome! Thank you!

[@kevinnguyen6518]

Great details explanation as always, love all of your video, greatly appreciated!

[@Hambxne]

Concise and eloquent as usual. Thanks again, amigo.

[@acservicetechchannel]

Thanks Hambone!

[@hvacserviceinstall2892]

Your videos are always on point. Thanks for sharing.

[@acservicetechchannel]

Thanks a lot!

[@tvrtkoivesic3839]

Thanks for all posts. Got your book yesterday from google play

[@chesstime356]

I do watch your videos over and over I like it thank you

[@jmdegava2906]

I was ready to replace the board on my unit, after a final inspection, the soldering on the red wire had broken off, re soldered it and the AC came back on.

[@shanegreen268]

Thank you for you sharing your knowledge 👍. Great video

[@acservicetechchannel]

Glad to help Shane!

[@tntheatingandairllc]

Great video keep up the good work buddy 👍👍

[@acservicetechchannel]

Thanks T and T

[@watermanone7567]

Great video, many thanks.

[@acservicetechchannel]

Thanks Waterman!

[@michaelcostello6991]

Very Interesting. Thank you.

[@andrewthacker114]

Good clip ,thanks for information

[@crforfreedom7407]

As a newb your videos have been vital; THANKS!!! The board series you've done have been great! I studied them all last weekend; had a Lennox G24 that wasn't operating, just that "click" at the board and GV when trying to light. Went through the OofOp, got hung at the GV. Tested all mech components; OK. ohms and voltages OK til I got to the GV on the board. It was sending random shots between 25v and 17v with each "click" to the GV. The ambient temp at the time was running in the low 50s. After doing other research, I heated the GV up to just warm to the touch, fired it up and away it went! The house is in transition I guess, they want to keep temps lower until occupied but I have them keeping it warm until I get a new board in. I don't think it's the GV, I think it's the low sporadic voltage not strong enough to pull the plunger on the GV when it's cold, but I'm not 100% sure about that. Guess I'll know for sure when I see what V I get off the new board on the GV. Your opinion would be appreciated....

[@acservicetechchannel]

Very interesting! The best thing to do would be to pull off the hot wire from the gas valve and measure the voltage when the wires are off of the load. This would be when the wire is disconnected from the gas valve with the power off and then turn the power on and let the sequence for heat get to that part and measure it. Make sure you are getting 24v to 29v there without a load.

[@crforfreedom7407]

@@acservicetechchannel OK great! We'll give that a go. THANKS!

[@jinkim1748]

Most of time, it’s cold solder joint. During auto soldering process, most thin parts are ok, but larger parts, such as relay legs or power scr connections don’t have enough time or heat to melt the solder, causing cold solder joint. I use x10 or x30 magnifier to check those larger glob of solder. I fixed refrigerator and AC card. Once fixed w/o using costly parts, they seem to work forever. Ex USAF and LM guy. In other KZbin site, many thanks from viewers. Thx

[@OthmanAlikhan]

Thanks for the video =)

[@jimbola77]

thank you for sharing!!!!.

[@acservicetechchannel]

Glad to help!

[@spacewolfjr]

Thank you! I had a dog in the vent and needed to clear it with a greased Scotsman.

[@grayac6802]

Good video!!

[@acservicetechchannel]

Thanks a lot Gray AC!

[@nelsonv3917]

Very good video my friend.

[@acservicetechchannel]

Thank you very much

[@jackbrennan754]

Good video vary informative

[@acservicetechchannel]

Glad it was helpful!

[@jkbrown5496]

I recently had trouble with my heat pump defrost board with adaptive demand defrost. Tech replaced the board and thermistors, but I found the information on ADD for heat pumps was sparse. I was able to piece together enough information to get an understanding. Of course, there's no info on the algorithm used. I got interested because the tech moved the termination temp jumper from 70 to 50 erroneously thinking it worked like the run timer on timed defrost boards. Didn't impact my repair, but made me curious. I didn't find any info on the best termination temp except for refrigeration where you want it a low as possible to avoid cycling the product. My board comes defaulted at 70 but I saw others that came set to 50.

[@johnsquires6271]

I put a generax gwnerator in a couple of yearrs ago an it seems like thats when my switch started to trip. Only when it gets below around 35 degrees. When thermostat suppose to switch from heat pump to furnace.

[@halildjencic1612]

What could be the problem if the red light on the board is not on at all?

[@intelin123]

my goodman control board status light does not light up. it has 120 coming out of the board into the xformer but no 24v coming out of the xformer i already replaced xformer with 2 new xformers but still have no 24v coming out of the xformer.

[@marklengal9990]

I’m looking for a Control Board For Ple10b Series Oil Pack(b039). "42934-003”. Having a real hard time. One of the relays burnt out Any help?

[@WillieMakeit]

Does it matter if color code of wire is flipped on "sec 1 & sec 2 "..

[@hosseinovisi9865]

I have a question about PVC vent pipes. What’s the difference between 636 pipes and ROYAL pipes. You know each one has its own glue (cement) I can’t understand this both are PVC. Isn’t this just the business? Thanks Hossein Ovaysi

[@macknumber9]

What would cause a blower motor to run slow but then when you reset the power to it runs normal for 5 or 10 minutes then goes back to running slow? Should I be focusing on the blower motor module? Blower motor? Or circuit board related like a relay? It will run slow and then once I turn power off and turn it back on it runs at full speed like everything is perfectly fine but only last for about 5 minutes before it goes back to slow and the motor makes some noise like it is trying to go faster....

[@antonyfranco3219]

Hey can you please help me figure this one out? My furnace stop working and I noticed the board was making a fast clicking noise, I bought a use board from ebay and installed but still the same, there's 118v coming to the board 84v coming to the transformer and 17 coming from the transformer

[@natejavier7701]

My gas fires up but my blower doesn't run on auto but run on ON setting. Please help

[@macknumber9]

On a relay for a refrigerator I am getting 12vdc on one side of the coil but the other only 6vdc...is that normal? Or are they supposed to be both 12vdc?

[@WillieMakeit]

Boards are hard to understand. Separate the low voltage side from the high side always got me and still does on occasion

[@frankjames1955]

My problem is.. after i changed the thermostat the fan stays on all the time no mater what settings i put it into... i took a pic of the wireing before i did anything , so i KNOW the wireing is ok

[@publicmail2]

My blower motor pulls 50 watts more with warm 100F air vs cool air 60F due to density use a PSC motor 1/3HP.

[@acservicetechchannel]

Yes less efficient when warmer, thanks for sharing!

[@michaelcostello6991]

@@acservicetechchannel Why does blower motor use more power with warmer air ?? You would think with less dense air it would use less power. What is the theory behind this. Anyone know the answer ? Thanks in advance

[@lancerudy9934]

So many boards for the units! You have to know how to use you meter to trouble shoot!

[@acservicetechchannel]

Yeah absolutely! Thanks!

[@PBS-nm1uu]

how do you understand the sequence of operation on the board, also how do know what relay control what??

[@EyeForKnowledge.]

It’s not something to understand. Only memorize. Draft inducer motor, pressure switch, ignition, gas valve, flame, and finally blower motor. If something drops out of that sequence, you know where your problem is. Most boards have diagnostic codes that flash on the indicator light.

[@fredcheng2890]

HVAC control board troubleshooting

[@northabbot7116]

This doesn’t really tell me where to find my AC control board 😢

[@RESISTAGE]

Terminalogy mistake by calling milli volts micro amps. A lot of people do that. Its never micro amp its milli volt.

[@acservicetechchannel]

Its measured with current in microamps. Work is being done as the voltage gets rectified to millivolts, thanks!

[@jimgarcia6824]

Poor training video It’s too basic