HVAC Training Board: How To Troubleshoot A Transformer (How To Check A HVAC Step Down Transformer)

[@manonfire3642]

This channel is invaluable. Thanks for sharing.

[@JumpermanTech]

Thank you! I appreciate you watching & your feedback 🙏 Stay tuned for new videos every week! 🔧

[@odd-]

Thank you sir. You just saved me 13K on a new system the HVAC guy was trying to tell me I needed. Replace the transformer, and everything is now working perfectly. Cost $27.

[@TheTruthSeeker756]

Man that’s SCARY!

[@Viewsandvibrations]

Whered you get a transformer for 27$ lol

[@KevinfinityDrums]

Make sure you out that scummy company with reviews and complaints to state authorities

[@Gregory-h8z]

lol 👍🏼 we’re not all like that 😂

[@Mr_Hundredaire]

This is the best comprehensive video I've seen on how to test a transformer.

[@JumpermanTech]

@@Mr_Hundredaire That's awesome. I'm really glad to hear that! Thank you for watching/commenting & stay tuned for new videos every week🔧⚡️

[@nicholasflores8783]

This week I diagnosed a bad control board because I saw no LED light on the board.This york package unit had a transformer just like the one in this video, and I did not know how to test because I rarely see them and because of my lack of knowledge I didnt test. I more experienced tech went out after me and did all that you just did and the transformer had no 24V coming out which powers the board. Man, I feel so dumb. This video will save me!

[@arayahailu8762]

Brother , believe me you could make your self the best instructor if you open your own school. I had few old school instructors/ hvac gurus explain to me about transformer, yours by far is the best . Because you explained everything A-Z

[@fse9449]

Just what I needed! Needed to replace the transformer and was not sure if the 24V output was DC or VAC. Seeing your meter set to AC cleared that up for me. Now I feel confident I am ordering the correct after market transformer. Thank you!

[@carlosboudet8441]

Very grateful for your excellent video. Last night we spent a very warm night at the Florida keys because our A/C would not turn on. I spent several hours last night trying to find the problem. This morning I watched your video and was able to find the control board with a blown fuse hidden under a couple of steel covers inside the air handler and fixed the problem. I had called several air conditioning companies and the soonest I could get one to come was tomorrow. Thank you again.

[@TheTruthSeeker756]

Man that’s good troubleshooting!

[@TalentNetworked]

Very good lesson. Talk at the speed or us to learn, unlike the other fast talker trainers. Thanks

[@almontes9846]

Thanks a million. I just fixed my 38 year old a/c unit. Thanks to your videos. I'm not sure how much money you saved me(28 dollar part) but I don't care I wasn't going to pay it. Loool. Thanks!!!!!!!

[@danielkarbon]

This video was perfect. The problem ended up being a bad Transformer. 120v coming in but no 24v going out. All the instructions and tips were spot on...thank you

[@joeydianza840]

Man, such an informative video. I'm just a regular Joe that likes to fix my own hvac, and this was extremely helpful. I wonder how much money I have wasted on throwing away good transformers.

[@triggerMB]

Thank you so much for this video. After watching,I was quickly able to replace transformer ($15), get heat pump working again, saved $ by avoiding a service call charge.

[@TxRealtorSA]

Thank you Sir! You will be abundantly blessed because you are blessing others!

[@JamSetMusicGroup]

Thank you, you did a great job explaining. Very clear and understandable. It helped me a lot.

[@alexanderboyd2280]

This was the easiest explanation of this concept that i can find. Thank you so much!

[@JumpermanTech]

You're very welcome & thank you! Stay tuned for new videos every week🔧⚡️

[@ytnax]

Brilliant! This is simply the best video on testing the transformer I have seen, period. I have also found that replacing the contactor is quite common and wise to replace both when the contactor is bad, which I guess many times will fry the transformer? Again, you made it super easy! Thanks bro.

[@LamboBoy8649]

Really appreciate this video. You’ve been a big help since I joined the industry a couple months ago

[@JumpermanTech]

Thank you! I'm glad my videos help! Appreciate your feedback 🙏 Stay tuned for new videos every week! 🔧

[@Mike-ig2zq]

Excellent video. Just curious, if the thermostat has no common(blue) wire, would it be ok to check voltage between R and Y,or W or G ? Thanks JMT.

[@JumpermanTech]

Thank you! You can still check between R & any other terminal wired. As long as the thermostat is in the OFF position, between R-Y, R-W & R-G, there will be a 24V reading. This will indicate your transformer is good. You can always also just check the 2 wires leaving the transformer but to save time, this method will work🙃 Thanks for watching! Stay tuned for new videos every week! 🔧

[@Mike-ig2zq]

@@JumpermanTech Thanks JMT. Lookin forward to the next one!

[@Opionview]

👍

[@BetjeWolff-v2s]

I could kiss you ! Finally a teacher on youtube who takes into consideration how our brain processes information. Thank you so much for shining your light and sharing knowledge with us.

[@Thetagamma1914]

This was exactly what I was looking for and super helpful. Thanks for sharing your gift and talents with us.

[@rashidatif4688]

Good day bud. What a beautiful and God gifted teacher you are. Everything you said crystal clear.All the best

[@Lam777]

Thank God that I encountered to you this platform , you are a genius .

[@buckyoufiden2187]

Very helpful. I watched both of your hvac transformer videos before sucessfully replacing mine. All your videos are so helpful. Thanks again.

[@Notime2waste_tito]

Thanks man I really appreciate this information during these hard times. I've found that my furnace has 120 volts coming in up until the transformer . Then it stops and I have no 24v volts. Just ordered the replacement transformer. The circuit board 3amp fuse didn't trip so I'm praying the board is OK. Upon further inspection of the transformer I've noticed what looks burnt cheese and the black terminal wire connection to the coil in the transformer is toast. I'm betting betting that's stopping me from getting the 24v. Now I gotta figure out why this happened. Again thanks for the info I know this comment is lengthy but I really do appreciate the video keep making great content.

[@alexsilyaev1593]

you are real teacher-very easy to understand for everyone!tnx!

[@herbertgreen2788]

10 minutes of video I learned a lot on the transformer the way you explained it was very comprehensive that was a excellent

[@lg3053]

Super great video. Very detailed and finally someone explained in detail what the numbers mean on the transformer.

[@tullyriverquail]

Making a diy incubator. Next I'm going to look for your entire training board explained. Thank you

[@JumpermanTech]

Sounds very interesting. You're very welcome & thank you! Stay tuned for new videos every week🔧⚡️

[@Jay-tr3px]

Hi. Thanks for the great video. I was wondering how to bond the zero volt of the control transformer to the chassi of the machine? Thanks again?

[@pedroaguilar1974]

In this example, I can see you are using a 40VA Transformer. How do I determine the size of theTransformer in case I got no the Electric Diagram . Excellent Video!!!

[@cprllc4246]

can be found with the model number and serial number of your equipment and some googling.

[@dido1803]

Wow!!! I love the way you explain this. I learned a lot watching this video. You explained very clearly, and easily to understand. I will continue to follow your channel.

[@jbdelta4542]

solid, straight forward and accurate, easy to understand info deserves a like and comment.. plus ya got the today was a good day song.. cheers

[@zanderhicks4717]

What is a step down transformer? Is the transformer in the furnace the source of the "RC" or "RH" power that the Nest Thermostat uses on the wall? Is it possible for the furnace transformer to not send enough power to the thermostat but enough to the furnace?

[@lindengauthier4407]

Very helpful video, thanks for posting. Im troubleshooting my reznor garage heater. It turns on runs a few cycles fine then when i come in the morning i can tell it hasn’t ran all night. Trying to figure out if its the transformer or if the circuit board is bad

[@dancroteau6892]

Great explanation!! Thoroughly enjoyed that as it was so well explained. Very much appreciated

[@georgeh8978]

Thank you, very awesome video and control board! So, I have 0.0 volts between C and R at my thermostat which could be the transformer but if it is an overflow switch would that cause the 0.0 volts? I have an electric heater and A/C combined to heat/cool the house. Any info would be appreciated! Thank you in advance! God bless!

[@izzybell11]

Interesting and helpful video. Well explained and excellent presentation . JMT thanks for sharing with us this valuable info.

[@JumpermanTech]

Thank you very much! I appreciate the support 🙏 Stay tuned for new videos every week! 🔧

[@DechadeChambers]

😂 climbing into crazy places, taking off all these panels, and running outside sounds like me!

[@Kocoea1]

Great video, but you didn’t say which 24 volt wire is hot and which one is common

[@MoreClassicMoreArtistic]

This channel is so awesome. I learn a lot from the videos. Thanks for sharing.

[@alishatruman]

WOW, this is so fun! Really helps break everything down easily. Thank you!

[@xElchulo305x]

Hi question to better understand Why you first check voltage between red and blue wire ( green ) coming directly from transformer then when checking at minute 8:28 you check red and green wire but not the green coming from the transformer connecting to the blue wire Thanks

[@strayhound61]

Great job on the explanation and the demo board! Very helpful.

[@brucebig]

Great video. I feel like an expert after listening. He really explains it all so well. Thank you

[@charlesfeduccia8065]

I have a bard package unit that is tripping the 3 amp breaker on the low voltage transformer when set to heat. Do you have a video to test that problem?

[@louisviciedo]

great video, my transformer has a blue and yellow wire on the low voltage side. the blue has 24v but yellow has no voltage. My unit works fine as far as I know. does that mean I need a new transformer? I have no control board.

[@LDiego]

This is nice brother, new tech here trying to learn as much as I can.

[@EpicBenjo]

Can a bad transformer blow the 3amp fuse in a furnace? Can’t find any frayed wiring

[@richiemaraj]

Excellent, very interesting for me as a young tec. Thank you.

[@anthony90491]

Loving these weekly vids 💪🏼

[@JumpermanTech]

Awesome! Glad you do 🙏 Stay tuned for new vids & be safe out there 🔧⚡

[@apartchi]

I have 19V on transformer of a furnace that is 24 years old. The board recently died as one of the relays blew. Should I replace the transformer due to voltage being low?

[@JumpermanTech]

19 volts seems very low. You should get a reading above 24V usually. I would add in that transformer for replacement. Thanks for watching! Stay tuned for new videos every week🔧⚡️

[@apartchi]

@@JumpermanTech your channel is so valuable. thanks for quick reply. Will replace the transformer and the board together then.

[@JumpermanTech]

@@apartchi Good idea. Be safe when doing so & thank you! Stay tuned for new videos every week🔧⚡️ Good luck🙏

[@fixingandmore4776]

Thank you. Can you help me how can I recognize the wires if the primary have 440v, 240v and 110v by using Multimeter? As there are 4 wires Red, White, Black and Brown. And how can I recognize the Common wire?

[@GUILLERMOJGARZON]

Nice video, very well explained. You have now one more subscriber.

[@morganmendieta3738]

for the 24v out what wire is common and what wire is line? Thank you.

[@troyb.4101]

So is the white 120 vac and the orange 120 vac for 240 vac input. Or is the white com/ neutral and the orange 240vac?

[@louisviciedo]

I just moved into a new home and want to instal an ecobee. I went to the transformer and only have 1 segmenet of 24v through the RED secondary, the GREEN secondary is grounded and doesnt have constant 24v. The GREEN wire is connected to my BLUE C wire. the result is that Im not getting constant power to my thermostat C wire. Is this a wiring problem?

[@francisdsa6790]

Very good explanation and demonstration appreciate you Great 👍👍💐

[@JumpermanTech]

Thank you very much! Stay tuned for new videos every week🔧⚡️

[@DanielRivera-i2v]

Is 129v on primary side indicate a bad trasformer?

[@abrahamchiapas3548]

Thanks teacher ..I fill more confident on my next transformer test on the next work order I will get I'm maintenance and I will use this info..thanks..

[@jluo18]

8:24 should it be the darker green instead of the light green wire that you checked in the vid?

[@frankkoppen7281]

cut the tape on primary side and found a blown fuse ? twisted the legs together, now have secondary 24 volts . is it safe to use like this ?

[@mikewood6287]

Great video! Question: my inline fuse from the transformer (blue wire) is blown. The secondary was not producing 24v, so I put a known good transformer in and it blew the fuse again. Could my board have a short in it that is causing this issue?

[@cprllc4246]

check relays then back trace for a short if relays are fine

[@RC-Heli835]

Hi Jumper Man! Do you chassis ground the 24 v side of the transformer on one lead?

[@wondermike8877]

Great video. Easily explained. Thank you.

[@chang-kailiu1028]

I have a question: if the thermostat is working, the 24v is from transformer. So the transformer should be good?

[@robertdavenport9095]

Great explanation and easy to understand

[@JumpermanTech]

Thank you man! The training board videos are some of my personal favorites. Appreciate you watching & the feedback 🔧⚡️

[@JGR088]

My black and white wire have female connectors, that go straight to the control board, should I stick the leads in them to see if I get the 120 volts?, Will that work?

[@zekenzy6486]

Great Video. This is exactly what I need. Thank you for sharing

[@nicolerennie]

this is really great and useful even more so because you made that yourself!! do you sell those? working art✨ thanks JMT🌟

[@JumpermanTech]

Thank you! I might sell them one day & would take a custom order if the opportunity came up. You're very welcome & stay tuned for new videos every week🔧⚡

[@bobflyer4346]

Another simple test is to feel with you hand if the transformer is warm. If Warm most likely all is good but may still have issues, get out the voltmeter and double check.

[@JaheemKirkland]

Very good teaching great teacher

[@Roadking2003]

I realize this is about Air. Hopefully someone can help me. Question? I have an overhead Reznor heater. Should there be 24 volts at the thermostat if the system goes into lockout due to a faulty flame sensor. Thanks again For great videos

[@jerryrobins1163]

You have anything on how to hook up a 480 to 120 vac step down transformer? I get that you have your com and your hot but with 480vac there are 3 wires that are hot I get confused when I read your supposed to ground your com. Any help here would be great

[@philcore4759]

on the secondary side, does red justify that its the 24v hot wire? i guess one would have to do a hot to ground test to do this?

[@javajetson257]

Can you do a video on how to make that board? How much did that cost you?

[@jeanifaust8815]

Informative, safety measures clear, clear explanation

[@carlosemmanuelgarciabrito791]

That's was awesome nice and neat I like the way you take your time to explain things

[@JumpermanTech]

Thank you! Glad you enjoyed the video. Stay tuned for new videos every week 🔧⚡

[@todosmiros8119]

thanks bro...I got a bad transformer. 240 going in, yet not showing 12v at the stat. and of course that faint burning smell in the unit by the transformer. Like the transformer in a neighborhood in the sky on the pole, they burn out.

[@3rkowtf669]

Great video, in my case my primary incoming power is 120 V for some reason, it is a transformer with 240v primary and 24v secondary set up, after replacing few breakers at the fuse box with the new ones now I’m getting only 120v input between Com and 240v lead and obviously 0v at the secondary wires, I replaced The transformer with the new one but no change, still getting only 120v, it looks like I got to check the fuse box, any advice what should I look for? Thank you.

[@hadibq]

New sub indeed. Great quality content 👍 TY

[@ManushNandhan-t5s]

Clear cut awesome please make a video about PAC and Tr calculation

[@josephmoore4598]

Good video but i have an unusual proble. 240v going in bur ony 5.0 volts coming out. New transformer , same, another new transformer,same. Go to different source for 240v, 24v output now. Any ideas,why?

[@tshaunscales8086]

Thanks for a great explanation and diagnostic

[@shelby50411]

Hi jumpingjack...whst could cause a gas furnace 24vac transformer to catch fire / melt on the 110v side ?

[@alk1981]

question how is my Goodman hvac system operational with out transformer functioning? got power going in nothing coming out and yet ac and heat works just fine

[@mansurniazz]

Great video for beginners. I check voltage at transformer

[@jmead6121]

so on any transformer on the LV side that ....Red is always + ..& green is always - side ? or does the LV side really matter .? - if one follows all way thur

[@getemjohnny]

Great video. Is there any books you can recommend as well

[@BoneCrusher_Gaming]

I thought is recommended to have the inline fuse on the primary lead not the secondary... I'm adding a transformer for my hvac uv lights

[@DepacDennz]

hello I got carrier AC /furnace now regarding the transformer black wire going/connect to PR1 ? and the white wire to SPEAR 1,2,3 ? (motherboard ) thank u

[@k00lboricua]

My thermostat only has r and w. Can I still test the voltage there? I don't have a C common wire

[@before120]

thanks man ...very thorough

[@JumpermanTech]

You're very welcome & thanks for watching! Stay tuned for new videos every week 🔧⚡️

[@johnjohnson7578]

Great training video!!

[@JumpermanTech]

Thank you! Stay tuned for new videos every week🔧⚡️

[@korgmanm6957]

What about checking transformer with power off?

[@sawhorse9820]

Very well done...Excellent!

[@devinclark8689]

Common knowledge but! Well done thanks man.

[@nekebl2]

Great hvac content. Can you do a vid about water reg valves?

[@JumpermanTech]

Thank you! I will make a video on that👍 Stay tuned for new videos every week🔧⚡

[@gwarlow]

Very well explained - thank you!

[@tonyv6216]

Great video. Excellent explanation.

[@dannymoreno03]

Excelente video 💯 great teacher