My Paperback, E-Book, Workbook, Quick Reference Cards: www.acservicetech.com/store E-Book: play.google.com/store and search "AC Service Tech" My Paperback and Quick Cards: www.amazon.com/shop/acservicetech Support the Channel: www.patreon.com/acservicetech Tool List: www.amazon.com/shop/acservicetech Follow and Like our page on Facebook to get unique content and updates posted every other day!! facebook.com/acservicetech Related Videos: HEAT SEQUENCER Operation, Timing, & Testing! kzread.info/dash/bejne/iXdlzJJtpaS0lcY.html ECM X13 Blower Motor Troubleshooting! kzread.info/dash/bejne/hZWhp9eMqtm_kqg.html HVAC ECM Variable Speed Blower Motor Troubleshooting! kzread.info/dash/bejne/nqOXsNhyh9bHnqQ.html Testing ECM Variable Speed Fan Motor, Make Your Own Tester! kzread.info/dash/bejne/nn-nq8mjda2qeaw.html Air Handler Control Board Operation and Troubleshooting! kzread.info/dash/bejne/hnmflpqticivY8Y.html Checking the Charge Tools: 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 FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4 FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6 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 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 Vacuum Tools: JB 6 CFM Vacuum Pump - amzn.to/2nqbvo8 CPS 4 CFM Vacuum Pump - amzn.to/2DxgPwY 1/4" Appion Valve Core Removal Tool - amzn.to/2uYr8WL 5/16" Appion Valve Core Removal Tool - amzn.to/2JHmfbP 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 JB Vacuum Pump Oil - amzn.to/2mGrlXy 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 Ameriflame Oxy Acetylene Torch Setup #1  Tip - amzn.to/2SRm3JF 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 Stay Brite #8 Silver Bearing Solder and Flux - amzn.to/2XIDJsY Aluminum Braze Rods - amzn.to/2IGNMu Refrigerant Leak Detection Tool: Accutrak VPE Ultrasonic Leak Detector amzn.to/2nFYKVe 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.

@chrisv.6951

2 жыл бұрын

Last night and night before it got real cold. So we turned on the heater. And both time I had to do a hard reset right by the unit to get the pilot to light up? 🤷‍♂️ Also the fan aomw.is blowing even though we turned the system off.

@josegabriellagares6862

2 жыл бұрын

My unit doesn't have a control board! The fan won't turn off unless I shut down the breaker... is that normal... an ac without a control board?

@officerkrupke4966

Жыл бұрын

@@josegabriellagares6862 You have one of the blower motors he described in this video where the blower motor module has the control board built into it.

@josegabriellagares6862

Жыл бұрын

@@officerkrupke4966 yes… that was the broken part… someone came and replaced it..

Excellent video!!!!!!! You are the best instructor/teacher I have ever seen in KZread. You are much much better than my hvac school teacher!!!!

Thank you! You’re such a great teacher that provides great detail on how and why things work or don’t. I watched over 4 hours of video for my issue and by watching your video my case was the first problem you mentioned, a bad thermostat! Of the videos I watched no one mentioned it. I’m glad I didn’t order a new control panel at $230. I ran to hardware store this morning snd bought a $39 thermostat controller and we’re back in business. My visitors are now all warm and cozy! Thank you again Sir!

Great Video! I pulled my Thermostat and the fan stopped running. Replaced the thermostat with new one and viola! Everything back to normal. Thank you so much.

Just gonna put this out here it might help someone. Figured out none of this is the problem of my furnace but the nest thermostat I installed. So when you install a nest or smart thermostat and it has an airwave feature, by default it will be set to ON. Just turn it off and that should fix it. Good luck!

@farzili4768

Жыл бұрын

thank you so much for your comment, this fixed my issue too

@spyro_oc9362

Жыл бұрын

Hi there, I am having the same problem I just installed new Smart Honeywell thermostat and fan stays on . Please advise, what should I do. Thanks

@RichardJones-us1xl

7 ай бұрын

Going to check my nest

@calebbroadhead348

5 ай бұрын

Replace Nest with a Honeywell 👍

@DS-fb9te

5 күн бұрын

@@calebbroadhead348Honeywell burn my compressor.

Thank god I found your video! I’m house sitting and it’s 3am and the fan on the unit keeps running So I took the circuit breaker out of the outside unit and it still ran! I can’t find the inside breaker box anywhere!🤷🏼‍♀️ so I pulled the thermostat off the wall and the fan finally stopped! Was so afraid to go to sleep Incase the fan burned up and caught something on fire! Thank you for your videos! Now off to sleep! 🤦‍♀️

Wow, if only every diy youtube video was this good. hats off to you!

Thanks for this video, zeroed in on the contactor/sequencer being the issue, replaced for 20$. I have hvac system working properly now.

Excellent video! As a teacher of electrical engineering, if I were a student, this the type of lesson I would to receive!

Excellent video on troubleshooting why the air handler fan continues to run. My issue was the sequencer and didn't realize it. I had unplugged that connector since it also had wiring for the strip heater which I don't use so that's why I unplugged it. When I plugged the connector back in the board, the fan started working correctly. Self inflicted but lesson learned. Thanks for sharing your HVAC knowledge.

Thank you for posting really I learn lot from you and I'm going to add one more thing on your video happened with me today on package unit or rooftop loss belt keeps the blower fun running

Great explanations, thanks for sharing your knowledge and time, blessings to you and your family!

You just saved me a bunch of money. The thermostat is bad… I a forever grateful

Thanks for this amazing video! What about if the humidity doesn't go away? What could be causing that?

An excellent video..My Trane 3.5 ton with ECM has intermittent "fan continues to run" problems....Suspecting one of the relays you described. Sticking contacts. Will follow your methods next time it malfunctions. Thanks for this great video and the tech information ! jP in Titusville Fl.

Thanks so much for making this video. Was the green wire for me LOL I never knew it had such an important role in the air conditioning system. Boggled me for like 3 or 4 hours

One of the greatest resources for techs new in the trade. Especially on long drives

Great and helpful video man, I appreciate the info you provided, thanks a lot.

This is the best video out there to troubleshoot this symptom you guys are truly masters of your craft, thank you for helping me. I have the fan on instead of Auto.

@acservicetechchannel

3 жыл бұрын

Thanks a lot Brayardo!

Great explain as always , you are a born teacher !

Thank you for being so precise and sharing your expertise!

Very informative on the blower motor not turning off! Thank you very much

This was very useful, the only bad thing is, i dont think i wanna mess with any of it but at least when the tech comes ik whats going on. Thanks!

Ac service Tech LLC.: thanks for your videos, it helped me a lot. I followed the 5 causes your recommended , I could fix my problem (package unit) once again ,, thanks for sharing your knowledge...

@acservicetechchannel

3 жыл бұрын

Nice work!

I had that problem today. The blower would just run. But the problem was a burned transformer. Changed out the transformer and blower stopped running checked system in both heating and cooling mode and now is working properly. Y’all videos are great

@MAKAROVOWNER

9 ай бұрын

My transformer is buzzing. Was yours? Even in off setting on thermostadt.

@iffgambetta5319

7 ай бұрын

@@MAKAROVOWNERbad transformer kept your unit running Even when removing signal

@connicrow9463

2 ай бұрын

​@@iffgambetta5319A bad 24V Transformer would stop sending any electric signal to the motherboard and thermostat, and contactors at the outside condenser compressor. How would a bad transformer keep the indoor blower fan constantly on and not shutting off?

@connicrow9463

2 ай бұрын

A bad 24V Transformer would stop sending any electric signal to the motherboard and thermostat, and contactors at the outside condenser compressor. How would a bad transformer keep the indoor blower fan constantly on and not shutting off?

another very informative video, the best HVAC channel!

Just wanted to thank you cus I tried the bad thermostat test and did it. So when the man came to look over my air again I pointed out what you said he tried it to and it stopped. Then he looked at the thermostat and found the switch was on furnace. Flicked it and all worked great. Thanks again 😮

We are now on Facebook! facebook.com/acservicetech Follow and Like our page on Facebook to get unique content and updates posted every other day!!

thank you for sharing knowledge sir 👍🙏

Great video. Thanks for this info. Helped me remember some things from trade school.

Incredibly sharp and detailed with great examples. The Best! Thanks so much!!!

Hey Craig, can you make some live service call videos showing your steps of troubleshooting? 😁

Very good Instruction...concise and to the point..

For anyone who might need this: He says in the video that if you disconnect your thermostat and the blower, or handling unit, turns off then it’s a faulty thermostat but I don’t think that’s correct. When I removed my thermostat my blower kept running and would only stop when I opened the breaker for the furnace. He says in reason 5 that in this case it could be a faulty module. In order to completely rule out the thermostat, you should disconnect your thermostat and pull the breaker to get the blower to stop running. Close your circuit breaker and see if your blower comes on. If it does the problem is not your thermostat. If it doesn’t than the problem is your thermostat. I did this and narrowed the problem down to the thermostat, which I replaced, and the problem went away. It must have been internally shorted. Overall this video is very good. I couldn’t have figured this problem out without it. Thank you!

@JesusMartinez-rc2xx

2 жыл бұрын

I’ve installed new units and have had the red and green from thermostat wire shorted and kept blower running even after pulling tstat

@JohnDoe-bd9cx

10 ай бұрын

I had a bad transformer.

@drakes89

9 ай бұрын

ty very much!

@connicrow9463

2 ай бұрын

How would a bad 24V Transformer keep the blower fan constantly on and not turning off ?

This was too hard for me to understand. But you answered my query should my blower run all the time. So I will call my guy. Thanks.

Nice video. Okay, suppose the blower is NOT blowing when it's supposed to? Twice, after overnight severe thunder storms here in Houston, the next morning the blowers on the AC units were not blowing. We have three 5-ton units. All three blowers ceased to function. Everything else in the shop works. Everything! Including the 5-ton units outside the building. They come on, and they push cold air into the housing cavity. ( You can easily feel the cold air when you remove the air filters) But.. the blowers do not come on and blow the cold air into the shop. This is the second time in 3-4 weeks that this has happened. After the first time, the AC crew replaced those blowers. This time, we can't get them to come back for service. We've been without AC for 7 weeks now. I do know that there are no surge protectors anywhere inside nor outside any of the three units. What would cause "all three" blowers to go out after a severe thunderstorm? Just seems so odd. Thanks! Hot and Sweaty By the way, those three AC units were installed 1 year ago almost to the date.

First, awesome stuff! I brought an UVC light for the HVAC. Install from manufacture has it powered by 110 v AC all the time. Just doesn't seem efficient for a bulb that has a run life of 9k hours. Watched this video to see if I could tie it into the Blower Motor Fan. What are your thoughts?

Excellent instruction. Now I can know if the repair man's diagnosis makes sense!

Always a pleasure to watch your videos my friend

@acservicetechchannel

4 жыл бұрын

Thanks again!

You are a great teacher! Thanks so much! 👍

@acservicetechchannel

3 жыл бұрын

Glad you think so!

Thanks for the troubleshooting tips!

Thank for the great information of the circuit I buying your book a two month ago it’s a great book

@acservicetechchannel

4 жыл бұрын

Awesome, thank you!

Thank you very much for this great video!

Great video, thank you.

Wow, great vid. Excellent explanation.

Thanks for in field test and how to You are the Man.

Excellent video.. What this video doesn't tell you was that the problem finds YOU sometimes.. My Blower circuit board relay contactors must have fused together, and that burned plastic smell was pretty obvious... Causing the blower to run continuously.. After a couple of days the relay literally burned up and scorched the circuit board. blower kept running Since the Rheem AHU was over 10 years old, the original circuit board was no longer available.. Had to hire an AC guy to rewire the replacement, which I HATE TO DO... Cost over $200 This year decided to start replacing the electricalsthat hadn't been replaced/failed yet.. AHU Blower transformer and capacitor.. Cost $20.. Why wait for failure? Then outside replaced the contactor and dual capacitor.. Another $20 Added a hard start kit.. $30

Very informative thank you so much we have had a HVAC man out here twice first he did maintenance but we have to turn the blower off by the circuit breaker because it does not shut off it keeps running but the temperature on the thermostat keeps getting hotter and hotter and hotter when we turn it off at the breaker and then flip it back on after it's set for a few minutes it will turn the air back on.

@jaywalton9552

2 жыл бұрын

Sounds like a bad high limit switch

@jaywalton9552

2 жыл бұрын

I'd check the sequencer and check the limit control switch.

@benchurch1309

Жыл бұрын

​@@jaywalton9552is the sequencer the same as contactor in outside unit

I have same problem with Carrier blower. Stays on, diagnosed it’s the ECM. Is there a way to change the component within the ECM to repair it

Another great video. Thank you For sharing your knowledge….

Wonderful tutorial!

Hi great video.. Do you have a video trouble shooting a fan that won't power on?

Good informative vid Craig ... I always liked troubleshooting ...

@acservicetechchannel

4 жыл бұрын

Thank you for the support

I had to work on a smart thermostat and my problem was the c wire connected! The wires ran were 18/4 I had to run 18/5 and it fixed the problem. Hope this helps someone

Thank you so much for your advice

GREAT VIDEO...THANKYOU BUD

Excellent video thank you for sharing! stay safe partner.

@acservicetechchannel

4 жыл бұрын

Thanks, you too!

This was great. I think the ECM Motor controller may be the culprit. I wonder if just an ecm controller can be obtained?

Thanks took my SEQUENCER out and took the top cover off and it's fried ordered a new one from Amazon, I'll update after installing the new one. I replaced the fried SEQUENCER with the new one today's system is now fixed fan now turning off on schedule. Auto and fan on working normally. Thanks for all your help AC Service Tech LLC! 😀

@HsingSun

2 жыл бұрын

@DangeRuss, What was the problem before you replaced the Sequencer?

@DangeRuss316

2 жыл бұрын

@@HsingSun The blower fan would not turn off when the systems reached the desired temperature. The strange thing is that it happened with no warning and the only way to turn it off was to go up into the attic and pull the breaker.

@HsingSun

2 жыл бұрын

Thank you for your post this info. Sometime ago, I wanted to replace the Sequencer, but it got stuck mechanically inside the air-handler. I will try one more time to take it out and order it now.

Good explanation. I have short of not exact but similar issue. My AC unit keeps running even after set temp is reached at thermostat. For ex I set temp at 74 and system turns on and once it reached 74 it stays on for more than 25-30 min. However if I turned the set temp higher than actual temp than system turns off immediately. Also if I manually toggle the off button from thermostat it turns off. On average my unit runs for almost 1 hours even whenever I check the thermostat it’s at 74. What could be the issue?

Thanks for your videos Do you have any videos on Lennox Inverter units or any other venders

Thanks for sharing... hopefully I can fix it with that info

@acservicetechchannel

3 жыл бұрын

You can do it!

Good video, well done!

Thank you Sir Craig ! Keep on posting

@acservicetechchannel

3 жыл бұрын

More to come!

I had an interesting call once. Turns out install never jumped the Rh/Rc on the tstat. If I remember common was on Rc so when in cooling it would just run. In heat everything worked fine. That was on a honeywell T6 pro.

Good video, nice details! Have a question, I have a Tappan 92.1 H.E. gas furnace, the thermostat went blank with good batteries in it, and new batteries, battery terminal had some bad corrosion on it, cleaned it up with vinigar.. then it came on, went off.. bought new replacement similiar model, and it did turn on cycle ignitor, and both fans ignited, Just before that I had a blocked n cracked j-tube, cleaned it, trimed and reinstalled. Also the power relay had a burnt Hole in it.. arouand where the two parts connect I believe. I was going to order another board, but will take some time to receive. Am I able to use the furnace for heat safely at night, or before going to bed and shut it down...?? I know the blower fan has two speeds to it ... low and high.. have not checked, but the high kicks on I believe..(definitely not the low speed. 10-15 minutes ran it, from the new thermostat installed. Also jumped it from the board with no thermostat before buying new one. Old one came on, then off after 5 or so minutes. Everything seems to cycle on, and off when shut down. Will check if it shuts down when it reaches optimum temp. (think it did but forgot) Part number T9AV1D12-22 Power Relay. that is damaged on from, smoke residue around front rear of board not burnt . Appreciate adice on being able to run the furnace temporarily/ sparingly while a new control board comes. Eric, MN

excellent video, looking for see more like this!!!

Excellent teacher 👏

Nice video. Explanation was really good.

@acservicetechchannel

4 жыл бұрын

Glad you liked it!

Don't forget to check where your leads are plugged in. Just got back from a call that had me stumped but whoever was there before me plugged the blower into the bottom of the contactor so it ran as long as there was power.

? Is that element wired correctly? Thanks for all you share.

Craig, Rodents favorite chew is the thermostat cable.

@officerkrupke4966

Жыл бұрын

Weedwhackers like em too.

Great job Craig

@acservicetechchannel

4 жыл бұрын

Thanks Bronchee Mims!

Awesome video. I disconnected my thermostat and put new batteries in. It seems to work fine now.

@ast-og-losta

Жыл бұрын

Well, that was last year. Now its running all the time again. Time to call the experts.

@rickrenfro4694

Жыл бұрын

@@ast-og-losta so what was the problem mine wont shut off on heat once it reaches temp setting either

I have a question is there a link that is a good reference on ohm ignitors to see if they are in good range

I need to learn more troubleshooting thank you for help us

Thanks for this.. saved me a few bucks

Can u do more videos on air handler and p tech units troubleshooting because i do maintenance

great video very helpful as always

@acservicetechchannel

4 жыл бұрын

Glad to hear it!

Awesome video thank you.

Excelente vídeo! ⭐️⭐️⭐️⭐️⭐️

In the last scenario where you disconnected the connector, and it keeps running the motor does this mean that the motor needs to be replaced, or are electronics in the motor tat can be fixed?

Im saveing this video thank you!!

Hey I took the thermostat off and the blower motor kept running I took the cable off the motor and then the motor stopped so it's somewhere in there between there right

Great video with great info thanks

@acservicetechchannel

4 жыл бұрын

Glad it was helpful!

UPDATE - It did fit !! yeah it was blower motor . replaced it and could tell it was working right away at the vents . It waa blowing weakly beflore so replaced capacitor at first but that wasn't it . Only $16 . Next suspected motor . Great that I fixed it . Century universal motor $74 plus needed bracket $30 YAY

When it is hotter out my attic AC fan will come on even though the thermostat is set to "off" and the fan is set to auto. It will go off only when it gets eventually gets cooler as sun sets. It will run with thermo pulled. So the attic temp seems to have an effect. Thoughts?

Thank you for the video sir....

We have a gas furnace. Blower is on and not stopping, but I don't feel air moving through the vents. I suspect a flap or something in the ductwork that's temperature controlled is still closed.....? It's 2am, I can't really call anyone. Can I turn off the breakers in the main panel and deal with it in the morning? I'm guessing the gas value would be either electrically or temperature controlled, such that I don't need to worry about leaking gas ......? I had to unplug the furnace, that breaker also controls the garage door, so I has to leave it on. Pilot light (s) are still on, hope they'll be ok. I will try to actually diagnose the issue in the morning. Your video makes it seem so simple, I really hope I can fix it!! Thank you for posting this troubleshooting information!

Thanks 😎✌️ excelente información 💯👍☑️

@acservicetechchannel

4 жыл бұрын

Of course! Thank you for the support!

Interesting. My AC fan upstairs has been stuck in on position for a whole day. Tried a few things but it keeps staying on. Think il just call up the home warranty and have them service it. It's cool to see bow these systems work though

Great video

Could removing the control module off the thermostat, while the system is operational not pose the same risk as when the batteries run out? Wouldn't the outcome be unpredictable and could the system sustain damage or blow a fuse? thanks.

Nicely done

Great job and video like always

@acservicetechchannel

3 жыл бұрын

I appreciate that

thanks on the videos you do you have help me bunches i work for a college in maintenance and i been having to help on ac calls to we hire a a/c tech thanks again for what ya do

Great explanation....

@acservicetechchannel

4 жыл бұрын

Glad it was helpful!

Is there a high temp sensor that keeps the fan running after the heat turns off? If so if that sensor thinks the box is still hot would that not keep the fan running. I have not opened mine up yet but did disconnect the thermostat wires last night before unplugging the unit when the fan continued to run.

what color wire goes to which terminal on a new goodman heat pump installation in the air handler? fan will not stop running when desired cool temp is reached in cooling mode.Thanks

I had a bard unit that stayed running even after it got satisfied but it would delay shut off like your saying but only if you set the temp quite a bit higher than the setting.

@The-H-inADHD

3 жыл бұрын

Which I'm not sure what kind of motor it is but I guess if it has a delay before cutting off it is ECM???