Air Handler Heat Strips Not Working, Fan Blower Won't Turn On! Common Problems!

In this HVAC Training Video, I show the Common Problems on an Air Handler with Strip Heating! I Show Troubleshooting Techniques on Multiple Components! Diagnosis can be Performed with the Power Off to the Air Handler or with the High Current Loads Disconnected Prior to Turning the Power on for Safety. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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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.
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#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #fanblower #stripheating #heating #circuitboard #sequencer
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[@edilsonserafim4784]

One of the best HVAC instructor ever

[@treywilson4310]

Ima a new tech fresh outta school. This is the best channel out there

[@MaMa-qh4dy]

You got that right!!!! And you made an excellent career choice because the young'ins are not interested in the trades like in the old days. It's a supply and demand economy, and you will do great by being great!.

[@Clasped003]

A former pro technician here. You are correct. Craig and HVAC School and Ty Branaman are the most important videos out there. Literally priceless knowledge. It doesn't mean that anybody can just come up and wrench on this equipment though. Stuff happens irl that you need pro training to understand and deal with.

[@ebenezerservices6363]

Excellent choice, the more you like it the more enjoyable it becomes and the reward it's really good!

[@scottieholland6486]

So when breaker is on it should read 24 amps correct? And that should feed to the relay

[@joshschumacher7984]

Been doing this for awhile and some air handlers are a nightmare to troubleshoot. No room in some of those cabinets

[@EastDallasKicks]

Think I was in a controlled lab environment AKA school and they had Lennox and carrier, the Lennox seemed like it was built to pop you. I have little lady hands and still kept shocking my self on some sequencer spade connector

[@EastDallasKicks]

Was the only way to get to the limit and heat strips

[@Begrateful2024]

Facts seems as if the engineering gets worse instead of better. Like why would you put the sequencers , relays limits etc. Directly behind the circuit breaker lol.

[@EastDallasKicks]

@@Begrateful2024 scary I like the fuse links those they don’t hurt as bad but that mf sequencer damn

[@HVACRTECH-83]

@Devonte Baker ya aaon puts drives directly in front of relays and fuses on some model configurations. I hate it and it's actually very unsafe to work on them

[@Edgarallen666]

Im fairly new to the trade and i live in south texas about 30 mins from the border and its barely getting cold so i dont have alot of experience with heat sequencers and this helped me out alot and i enjoy watching your videos, thank you so much sir!

[@chriswigent9150]

Thank you for all your training and advice. You have helped me quite a few times. I've been in this field for a couple years, and still having trouble understanding the old carrier electric furnace 40AQ030. I've fixed one that was worked on by several hvac guys , I've put it back to original equipment and wiring and still having difficulty. Carrier has upgraded a 230v fan motor but with a little bit different wiring .

[@jerrypagitt]

Absolutely an excellent and informational video. He covers 100% of what might be wrong. Again, a professional video that any novice can understand as well as the professional.

[@deanmartin1966]

Great explanation of an air handler. Thanks for sharing.

[@erep4537]

Ive been in the trade since 1987 and have taught alot of beginners. I have to say that these videos are very imformative and I will recommend them to my newbies

[@aridematos3555]

When does everything start to click? I've been an apprentice for 5 months and it still seems very complicated for me.

[@roelfuentes6157]

Only been in the field for about a year and a half, honestly these electric heat strips (in all electric and heat pumps) always gave me trouble. This video is great information for beginners like myself and hopefully a refresher for the seasoned techs.

[@dariuswalters3696]

Fr been in the trade about the same amount I’ll take straight ac and gas over a heat pump every time

[@KharmenSense]

Been watching several channels, you're is by far my favorite. Thanks for taking the time to spread the knowledge.

[@stevencossaboon3237]

Great video Craig. Thank you!

[@Alex-jo2oi]

Awesome video. Very precise and descriptive. These help out a lot!!

[@sonGOKU._.]

I learn so much from this video ❤

[@markm0000]

Your videos are really good I’m learning many things that I wouldn’t have with trial and error.

[@Geetr469]

Great video. You're a good teacher 👍

[@carlsummers]

Thank you for such great educational information!!

[@aaronfox5808]

Great info and Video

[@g.culpepper7134]

Great video!! Extremely thorough 😊

[@APHVAC0913]

Great video 👍

[@MsFishingdog]

Great video

[@jrpritchard1622]

thanks for training advice very helpful when our hvac tech is out or on vacation i have to fill your videos have help me

[@rocker8692]

Craig is the man

[@riverratfishing]

Fantastic video. Very helpful as always.

[@Sylvio15]

This video is helpful

[@hugoguevara3864]

Very helpful thanks you

[@ubaldosoto7591]

Wonderful video for older heat pumps. Exactly what I was looking for.

[@acservicetechchannel]

Glad it was helpful!

[@mightytort4739]

How old is old? I have one Trane heat pump around 12 yrs old.

[@user-qf7ed8tl7f]

Thank you so much for your video and very good explanation.

[@eman3208]

Another great video! Thanks!

[@mickthomas5469]

Great video - thanks for sharing 👍

[@bobbybrown8926]

great video and explanation of these components.

[@harveywholesales9226]

best explainner

[@robertmunguia250]

That’s a neat tester!

[@pizzle1011]

Great video! Don't have many air handlers up here in the Chicago area. Ran into one and one if your previous videos helped

[@povoljan13]

done, rewatch if needed.

[@marcusdarnell3348]

Great video! I assume the reason why you used the rectifier was because that relay operates off of DC voltage

[@Mudo94]

I always wondered how those small square ac to dc things worked. Thanks. Hardly ever see them

[@pascualangulo1]

Super 👍

[@markm0000]

It’s also good to measure the low voltage input side of the relay coil for excessive resistance. That can cause intermittent issues.

[@baileybroton4800]

I’m starting hvac/r certification in February so I’m studying as much as I can before I get there, as I’m the only girl enrolled so I hope to keep up 😁

[@Clasped003]

Gender has no distinction in the trade. Put as much effort into learning and being a good student, and always remember to treat fellow tradespeople with respect. Good luck, and remember that above all else, electrical knowledge will always put you above the rest. I can never underestimate how important the electrical knowledge is.

[@baileybroton4800]

@@Clasped003 I was talking about the entering physicality of it with large units cause I’m going for commercial but yes I agree

[@ahmaderfanfaizi5024]

Very helpful and educational video , thanks for making such videos, and it really helps new technicians in the field

[@acservicetechchannel]

Thank you for watching! I'm glad you found my videos helpful!!

[@darius1988]

What an ancient ventilation unit :)

[@user-fk4fm7qe1e]

Im J Hernandez im lerning alot with the videos they are very helpful thank you for it

[@fakku6356]

Thank you for your advice its really helpful thank you thank you thank you I think that I might be close to have my own company 😆😆

[@Farm_fab]

You mentioned thermostat wiring done wrong. I was on a commercial job site that the apprentices wired the temporary power GFCIs wrong at the shop, and kept tripping breakers when plugging anything into them. I'm not an electrician, but I do know polarity on AC power. At work, they have a sign above the cart for green cones used when servicing MCC panels for the arc zone, and among other things, it says that they are only to be used by "electrictians". I mentioned that to one of the mechanics there, and they said that they now know why the cones weren't being used. No one in the employ of the company has that title. I told the mechanic that this must be referring to some professional that is both a magician and works with electric. What a typo.😀

[@douglas747wct]

Hi Craig, great training and videos. I purchased your book and got a lot out of that too. However, I have a problem that is bewildering and hoping for some advice from you. Tempstar FCX6000C AH with PSC fan motor that won't turn off. It is not equipped with a Sequencer but has an Overtemp Limit switch that isn't tripped. HP unit is TCH260AKA1 with demand defrost board. Pulled TStat, no joy. Checked 24V wires for shorts and continuity to Tstat and HP. All ok. Checked signals to pins on AH Fan Control Board and discovered Y from HP has ~18V on it continuously in relation to C terminal. With all signal wires disconnected except for R, C and Y wires from HP, the AH fan turns on - removing Y from AH Y terminal causes fan to turn off after normal delay. I don't know if that voltage is what the demand defrost board normally sends to AH during defrost cycle to turn AH fan on. So the question is, should I suspect Demand Defrost board on HP or Fan control board on AH? I loath throwing parts at anything. I will check the defrost cycle test function and note if the unit functions normally. I'll also check the condenser coil defrost sensor. Your help is greatly appreciated.

[@chiplaurn8175]

Can you please do a residential Aquatherm (firstco) combo ac cool/ hydronic heat. If you haven’t already. Thanks for the great vids!!

[@markscott4159]

Can you explain why for some components it's better to test resistance rather then just continuity? I know for some components a resistance test gives you the value you need to verify its working properly but with other components like fuses continuity gives you that answer with an audible beep or silence. I guess what I asking is what components test better with resistance and what components test best with resistance?

[@dahdahforsanful]

Thank you Bro , I have one unit i check all wiring are ok , the proplem is fan is running but the heater not working , when i shut off the fan the heater work

[@Yourengineeringstandpt]

Can also do a continuity test thermal limit swirh correct

[@NorCal-refrigeration]

Good stuff 🤘⚡️🤘✨✨✨

[@acservicetechchannel]

Well Dave, you encouraged me to write a minsplut book roughly two years ago. Its now done and coming out in Jan! Thanks for your encouragement!

[@NorCal-refrigeration]

@@acservicetechchannel I need a copy. Just went to vrv training and still don’t know how to fix them 😂😂😂😂

[@whitesheatingairappliancer7101]

I will be buying the new book. Thanks for everything.

[@hinojosa552]

Hi, you didn't create a book for the heating electric element and relays ?, on how they are powered, I seen your video, excellent, I would like yo buy your book on the electric heating, already bought the air conditioning book

[@chrisdeanndavison3626]

About the DC relays. Johnson Controls / UPG used 28v coil DC relays WITHOUT a rectifier in some of their air handlers around the 2010s. They were sending 24v AC to the relay coil. Can someone explain why (and for that matter how AC voltage works on a DC coil)?

[@mariolopez1]

Hi i been following your videos and i have a question about the common wire .how it works? what it does ?why the system doesn't work without it. Thanks

[@ilovenythismuchilovenewyor5801]

hey Craig when you make your own testing set up like w a transformer . and have an inline fuse set up ... what size fuse do you use w that ? i want to make my own lil trouble shooting set up .. I picked up a 10/30 output transformer w a 110v input .. I added a plug to it abd 24v t stat wire w that online fuse holder but wasn't sure what's besr fuses to use for trouble shooting 24 v components.. is. a 3 am fuse good or what do you recommend... also I will be ordering your new book soon on the mini splits

[@curtisroy6369]

Was that heat kit flipped to match the specified air flow direction? I only ask since the lettering on all the components is upside-down. Is this common practice so that heat kits can be used on both up and down draft air handlers?

[@depv343]

I have a lennox system where the transformer in the air handler trips every time heat is called. The system comes on fine with ac and fan only but when it calls for heat the transformer trips pretty much immediately. Any thoughts what it could be or what i should check first? I appreciate any help in advance as winter is coming 🥶 and the family needs the heater.

[@shooter2843]

Where does the test transformer get its high voltage from?

[@paulcharpentier1241]

Can you put a video up on how to make, or where to get, a transformer tester?

[@whitesheatingairappliancer7101]

I'll just use your multimeter set the voltage AC disconnect your low voltage leads from the Transformer and put your probes on those connectors with the unit powered up you should read 24 plus volts ac. You can also do a continuity test with no voltage and the wires disconnected from the Transformer to see if the windings are broken internally.

[@GotchaplumberGotchahvac]

.1 resistance for thermal fuse

[@Gametight601]

Question! Does a 6 pin General purpose relay supply the strips with 24 volts? The unit does not have a board. I'm trying to trace a short down and it's difficult. Im getting 24 volts on every thermostat wire but the heat wires. The heat strips have a board which is CNT06195. I've changed it, but I'm still not getting the voltage I need to the heat wire. Before I changed the board, the heat strips would cycle on and off with just 13 volts. Now that I've changed the board with CNT06194 nothing comes on in heat mode , now I'm getting 16 volts. Part of the heat strips would stay on for 7 seconds and go off. Help I'm puzzled!!!! This is a trane. GAM2A0c48s41sba. Thanks

[@jesuscastillo1083]

What’s the difference between continuity .and ohms

[@steepndeep615]

Always check strip heater to ground

[@johnp7390]

Hey, you only have to remove 1 wire on each component to check the fuses and hi-temp limit switches!! Why potentially loosen more spade connectors and create an intermittent that wasn't there originally than necessary?!?

[@ParabellumX]

He could've done it for any number of reasons. He could've done it because he gets slightly nervous when recording his self. He could've done it because he has obsessive compulsive disorder (OCD), and everything has to be done in certain multiples, etc. It is insignificant to question one who is demonstrating something with the sole purpose of educating others, just so as long as the principle itself is understood.

[@sheltonhood4428]

Basic using OHM'S Law

[@arnelarcedo132]

Hi, where can I get the 24 volts temp. power supply tester that is attached to the transformer? tnx in advance

[@andrewmcdonald4519]

Change the batteries In your meter

[@iceesrule75]

Question?.. when you are checking ohms you are ✔️ getting continuity?

[@chrisdeanndavison3626]

Hope this helps. Continuity, as in a closed circuit, should read 0.0 ohms (or close to it). If the ohm reading is much higher, as in 0.5, first check your meter's reading by just touching the two test leads together. If you still have a reading like 0.5, correct the problem with your meter. If your meter reads 0.0 lead to lead, but the component reads higher, it can be pitting on the contacts of the component, or just a poor connection of your test leads to the component.

[@zahkiyyah]

Can a heating element be added to an air handler?

[@Jurornumber5]

What costs more, the parts or paying the tech to test and measure all of these parts?

[@Hvacmaniac97]

Sequencer is just another contactor, i am enlightened 😅

[@saulzain1957]

What do you do if it's a 2 stage heatpump package and the 10kw heat strip is not working?

[@jkbrown5496]

The only impact of a heat pump on the electric heat strips is that the defrost board should energize W to run the electric strips during defrost. My heat pump got wired with the W2 on an input terminal on the defrost board instead of the output so wasn't being energized.

[@mrgreen9086]

What could be the problem if you have an electric furnace and oncall for heat the heat strips turn up but the blower fan which is controlled by fan relay does not. Fan only comes on if you turn the thermostat fan in the on position but not auto when calling for heat

[@juliomoreno5370]

I have a contactor instead of sequencer

[@Dontbeweakvato]

This education is very important to brush up our knowledge. But hopefully the death warning will prevent unknowledgeable people from trying this... Homeowners and such. One wrong move and bam, your life is over. I work on these, at times, like I'm working with live ammo or bombs 😂

[@cassandraclements3636]

Why my auxiliary heat coming on and its not cold enough outside

[@SalahDambo-gb6cs]

I don't see a problem with taking money, otherwise you can do a lot،If it is through legitimate methods, it works

[@Turfgreenpro]

Your multimeter it’s very complicated I don’t understand it. You should have a common meter on your instructional videos so we can see where to set our meters and what you are talking about. What option is electrical resistance on my meter??🤷‍♂️🤷‍♂️

[@djaudioxtc02]

It gets even worse when you have the communicating kind and the AVC thinks heat relays are closed when they are open and because of that it locks out the AC😂 Talk about scratching your head.

[@jasonrhoades9270]

Yea tell the world our trade for free.

[@jesuscastillo1083]

He wants the people buy his books , l don’t think . He is doing it for free,

[@coolramone]

Most people don’t have the time, or the interest, or the mechanical or electrical ability to do this. They would rather watch movies or music videos or play games or sports or spend time with family or work at their jobs. Everyday I go to work I pass the fitness center and there are 50 cars in the parking lot.

[@sherwinalvarez7365]

Great video