Top 6 Gas Furnace Parts That are Blamed or Misdiagnosed as Bad! No Heat!

In this HVAC Training Video, I show that During a No Heat Service Call, These are the Top 6 Gas Furnace Parts that are Blamed as being the Problem. Oftentimes these parts are Misdiagnosed during the Troubleshooting Process.
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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #oil #gasfurnace #furnace #misdiagnosed #faulty #furnacerepair
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[@acservicetechchannel]

The E-Book and Paperback at our Website: www.acservicetech.com/the-book The Paperback at Amazon: www.amazon.com/shop/acservicetech Support the Channel- www.patreon.com/acservicetech Tool List- www.amazon.com/shop/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Related Videos: Top 10 Pressure Switch Problems- kzbin.info/www/bejne/mIqZgpakoceoqquEressure Switch Troubleshooting- kzbin.info/www/bejne/rGq0iHyobrl8jLd3leaning the Condensate Tubing- kzbin.info/www/bejne/nabJZId7iMdmjJI Pressure Switch testing and Replacement- kzbin.info/www/bejne/bIGZo2mGhKx7esV8ow The Pressure Switch Works- kzbin.info/www/bejne/b3Wkdo2soN6Cb6M Why The Pressure Switch Wont Work While the Condensate Drain is Clogged- kzbin.info/www/bejne/jnykqq2knM2fqNGJsing The SDMN6 to Test Pressure Switches- kzbin.info/www/bejne/o3zXeH9ug69obrM ECM Blower Motor Testing: Make Your Own ECM Tester- kzbin.info/www/bejne/onzWepqgeq93f6s X-13 ECM Blower Motor Testing- kzbin.info/www/bejne/iZLQdqiJr9uMmKd5CM Variable Speed Blower Testing- kzbin.info/www/bejne/oqDGf6lvjNiUpKM 10 reasons Why The Blower Motor Won't Turn On- kzbin.info/www/bejne/imbNZYRuj9WSp80 4 Reasons Why the Blower Motor Won't Shut Off- kzbin.info/www/bejne/rYmWmXanrLqdoaeLhat Type Of Blower Motor Do I Have- kzbin.info/www/bejne/e3nahY18q9tgaLM 240 volt PSC Blower Motor Fan Speeds-kzbin.info/www/bejne/a3ishZqph9KGkJY How to Tell the Difference Between Blower Fan Motors- kzbin.info/www/bejne/e3nahY18q9tgaLM Gas Valve Troubleshooting- kzbin.info/www/bejne/m6a4o6ico5t0qat3ombination Gas Valve, How it Works- kzbin.info/www/bejne/bZ6Yi3eshNSJrbc Smart Valve Troubleshooting- kzbin.info/www/bejne/p5vVo4ujgdF_iMU Furnace Flame Sensor and Rectification Troubleshooting- kzbin.info/www/bejne/gqXJmJuLjsufY5Z8ow Flame Rectification Works- kzbin.info/www/bejne/oZe0Y5ysp5maidk Single Rod Spark Ignition and Flame Rectification- kzbin.info/www/bejne/fX-8lYJ_q7ysr80 Two Rod Spark Ignition and Flame Rectification- kzbin.info/www/bejne/moaplImAja9rjMk Troubleshooting the Furnace Control Board- kzbin.info/www/bejne/ppnWhoyupJxooLc Thermostat Wiring to a Furnace and AC Unit- kzbin.info/www/bejne/faC3mXSihNuGqtU Heat Pump Thermostat Wiring Explained- kzbin.info/www/bejne/qpeVgKt5edyffLs Thermostat Wiring Diagrams- kzbin.info/www/bejne/nmOXXqFvoN6qZtk Clogged 90% Furnace Heat Exchanger- kzbin.info/www/bejne/qX_PiI17r7iZqKM Why the Furnace Sequence of Operation is Important- kzbin.info/www/bejne/q3zWg6OPotyfpK8 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 Water Column Manometers FieldpieceSDMN6 Dual Manometer Pump - amzn.to/2jyK5Ka UEI Digital Dual Manometer - amzn.to/2CWC6BD Supco Universal Adjustable Pressure Switch -.01wc -10.0wc - amzn.to/2G1y0py 3/16" x 3/16" x 3/16" brass barbed tee - amzn.to/2INSRhQ 1/8" NPTF x 3/16" barb fitting for reading wc pressure - amzn.to/2G563Bq Combustion and CO Detectors: Testo CO detector amzn.to/33yqkqK Testo 310 Res Combustion Analyzer amzn.to/2NuYAO5Testo 310 Res Combustion Analyzer with printer amzn.to/33vLl53 Testo 320 w printer amzn.to/33xZbUz 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 JB Vacuum Pump Oil - amzn.to/2mGrlXy Checking the Charge Tools: Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI 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 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.

[@Honestandtruth007]

Finally, you Show your face. I thank you for your time and Sharing your knowledge. By watching your videos and some others. I was able to install A/C 1.5 ton condsensor unit and evaporator coil pair with the previous installed gas furnace and Everything is working great. Now the furnace is down and I think is inducer motor going bad after 6-7 years of flawless running. The brand is Goodman. I am just a handyman but not technician or maintenance.

[@TheSallyboy104]

9¹

[@SanchoSanto]

Thank you so much. Two repair men wanted to charge me $1000 to replace the control board on my old furnace. After 15 minutes of trouble shooting I fixed the system without changing anything. Those blood suckers are really something.

[@veteranjeeper1120]

What you are doing with your channel is awesome, thanks for helping with almost every HVAC situation we run in to. Keep up the great videos!

[@acservicetechchannel]

Thanks a lot Mike!

[@ChargedUpServices]

Currently teaching Gas Heat, feels good to know Im leading my student in the right direction. Great Content!

[@acservicetechchannel]

Absolutely, and I love the students aha moments when they put pieces of the puzzle together! Thanks for doing what you do!

[@alexramos1435]

Wait till you get to heat pump.

[@ChargedUpServices]

Alex Ramos I am teaching both currently.

[@alexramos1435]

@@ChargedUpServices good stuff bro. With the nest e thermostat I've seen alot of heat pump issues and the programming on the thermostat. About 6 calls in the last couple of months.

[@peterstencell804]

I'm a commercial gas tech. Flame rods do go bad . But takes time. I've seen one's you could clean up but won't conduct due to heat treated and metal losses it conductivity. The porcelain bleeds to ground. You can test this with a Megger.

[@RineboBohead]

I had some issues with a unit heater recently and am very glad I watched this.

[@acservicetechchannel]

Glad to help!

[@johnguerrero4305]

great video as always! After 30+ years in the HVACR field, I really appreciate the effort you put in all your videos!! Your channel and "greyfurnaceman" are the only ones I'll actually see. I love reading the newbies' reaction when they learn something new and useful! THANK YOU AGAIN....

[@tavhigh]

You should check HVACR videos.

[@nlrmoldw1712]

You, my friend, are the man! Yet another in your great series of videos that I’ve caught and, like the others, this one’s also great. And I would be remiss if I did not also commend you on your superior knowledge of your trade, and the thoroughness and simplicity in your method and manner of explanation. And I admire your honesty! Your picture, my good man, should be in the dictionary next to the definition: professional! Again, very well done! Thanks a bunch!

[@acservicetechchannel]

I really appreciate you taking the time to write the note, thanks NLRM OLDW!

[@bradmironik6137]

Great comprehensive video. I've watched most if not all of the links below and either learn something new especially with the ecm motors or utilize them for a refreshing my own knowledge. As you said, a tech needs to understand sequence of operation period. Thanks for all the knowledge you share.

[@acservicetechchannel]

Glad to hear and thanks Brad!

[@trevorhvac6799]

I see your up early too. As always. Great video brother.

[@acservicetechchannel]

Thanks a lot Trevor!

[@jeffwang2012]

u r the best! i bought ur ac book this year and read it all the time! when u will release the"heating " book? ...

[@acservicetechchannel]

I would like to develop one in the near future. We will have quick reference cards coming out next week and a workbook for that ac/refrigerant book within a few weeks. Thanks for letting me know of your interest in a furnace book Jeff!

[@nlrmoldw1712]

@ AC Service Tech LLC Can’t wait for the heating book! Gonna be a best seller. Gotta be!

[@Honestandtruth007]

You always precise and exact to the point of troubleshooting steps and install new unit. Thank you so much for sharing.... God bless you and your family 👍💪😇

[@acservicetechchannel]

May the Lord Bless you too! Thanks!

[@Honestandtruth007]

@@acservicetechchannel Can you recommend me a good gas furnace but not the best one due to the high price of it ???

[@wetheadedtinknocker6887]

Good Channel! Been watching a few years now and really enjoy what you’re doing here. I’m a state licensed HVACR tech with over 20 years and you never know everything, I just assume I don’t and from there I have a foundation for actually learning new gear, how it works and when it doesn’t why. I learned that from someone older and more experienced and it works.

[@deanmartin1966]

Excellent video. who's the bad tech that gave a thumbs down?

[@acservicetechchannel]

Ha ha, always one or a few! Thanks Dean!

[@eliasmarkos5740]

Can't thank you enough Sir ... THANK YOU

[@jawadaboucha8266]

You're doing really awesome work on this channel ! Thanks.

[@acservicetechchannel]

I appreciate that!

[@bryantylerservices]

Awesome explanation! Great job description on those 5 common mis - diagonosed components. Patience and knowing sequence of operation will go a long way. Intimidation is the biggest culprit. Thank you.for your time. Bryan Tyler Refrigeration

[@acservicetechchannel]

Thanks a lot Joseph!

[@propanetechllc5675]

Another solid video. Thank you for the knowledge.

[@acservicetechchannel]

Thanks a lot Propane Tech LLC!

[@MaMa-qh4dy]

Another excellent video!! Thanks so much for the links. Saves a lot of time looking in your library. Thank you.

[@acservicetechchannel]

Thanks Ma Ma, glad to help!

[@carlmanis879]

You missed a few steps in what the board does. You most likely left them out for time. When I start hiring people I will ask them to bore me with details on what happens on a 80% furnace. From call for heat through furnace shutting off. If they take 3 minutes to answer if they are a great tech. Troubling shooting a pressure switch or flame sensor or limit switch the board does two thing it sends out a voltage and then must receive the voltage back. If the board don't send it to the component or read it when it returns it bad. watching the burners when the the blower kick on is a great crack indicator. But what I have seen here today you are a great tech and teacher.

[@acservicetechchannel]

Carl, yes I explain them in much greater detail in the flame rectification and flame sensor videos. Everything you are mentioning is absolutely correct, thanks a lot!

[@Honestandtruth007]

I am not a Tech but a Handyman and I Understanded it very well. From most of his Videos and some other people Video clips, I installed the gas furnace and AC unit all by myself. Oh yes, Everything in Life no One tell us Everything in details. Not even between a husband and a wife and that is the Reality of Life.....

[@vetdadcubby4722]

Awesome work and explanation sir! 👍

[@acservicetechchannel]

Many thanks!

[@jimbola77]

dang excellent video partner thank you for sharing! you look sharp!!!!.

[@acservicetechchannel]

Thank you very much Jimbola77!

[@rocker8692]

Excellent job

[@acservicetechchannel]

Thanks Chad!

[@alexramos1435]

Damn. I never knew this. I just tell the owner that they need a new furnace.

[@agahajak]

I sell them a humidifier too so the ductwork doesnt melt

[@justing8674]

You guys are brutal lol

[@sman5877]

wow that’s good information. i gotta get one of those camera’s

[@acservicetechchannel]

Yeah the testo one is very inexpensive, thanks!

[@andrewthacker114]

Good clip thanks for information

[@YTsux24-7]

Looks like the bearings are a little tight when you spin the cooling fan on your ID motor Craig. Good morning, good lesson!

[@acservicetechchannel]

Hey Tom, thanks! Those carrier/bryant/payne inducers are all like that. It isn't the bearings but is due to the heavy weight of the inducer wheel inside the inducer housing, thanks!

[@chesstime356]

Great video thanks.

[@sergioserrano2764]

Well. Done

[@Eddy63]

Great vid Craig ... Good info as usual ...

[@acservicetechchannel]

Thank you! Appreciate the support!

[@Nass4168]

Thank you for a well explained video

[@acservicetechchannel]

Thanks a lot Nass!

[@lancerudy9934]

Thanks for the great videos.

[@acservicetechchannel]

Glad you like them!

[@scottgillard4695]

Thank You very detailed in all your videos.

[@jonathanraul4086]

U r great ty 4 sharing your knowledge

[@acservicetechchannel]

Thank you very much Jonathan!

[@zekenzy6486]

Thank you for sharing ^_^. If possible could you make video how to trouble shooting Oil furnaces , oil burner . Thank you.

[@acservicetechchannel]

ZE Kenzy, thank you for letting me know what you would like to see!

[@clarksafg]

Great video and videos, I think you should a service series on HWC unit's both gas and else. That would be great

[@acservicetechchannel]

Clark, thanks for letting me know what you would like to see!

[@bradmironik6137]

What are you referring to as a HWC? Haven't heard that one yet.

[@clarksafg]

@@bradmironik6137 thay are big in the midwest especially in apts ect. www.behler-young.com/hvac-equipment/packaged-units/hwc-units

[@donnierobertson3088]

Great job again like always

[@acservicetechchannel]

Thank you for your support

[@julzsep90]

A ton of help sir thank you as always

[@jashimuddin7716]

Thank you very much god bless you

[@acservicetechchannel]

May the Lord Bless you too! Thanks!

[@Breca]

I'm out there with my new Fieldpiece SDMN6 you have been a great help to me. Much obliged !

[@randallcalhoun6604]

Maybe a video on the most overlooked issues too. Especially plugged drains on 90% condensing furnaces. I go behind lots of techs for that problem as second opinion to solve recurring/unsolved issues.

[@acservicetechchannel]

Randall, thank you for letting me know what you would like to see!

[@patmatt975]

We have a scamer in my area that uses " you got rust on your heat exchanger. You need a whole new system" Sells em every time.

[@randallcalhoun6604]

With regard to plugged drains you get all the symptoms of other problems. Flame roll outs, open pressure switches, high and or rising flue c.o. on combustion testing, limit safeties tripping, inducer fan problems etc

[@randallcalhoun6604]

As for bad h.e. scams i see people doing that around here in Michigan too. I Personally change a lot of commercial heat exchangers but those are really easy to find since packaged units you can just pull the door and take a picture for the customer. Residential you need a scope or another more tedious way to prove it to them. I never sell a furnace to anyone unless its a clear breach that warrants disabling the system for safety/health concerns.

[@simpleman425]

Great educational videos! Nice job!

[@acservicetechchannel]

Thanks a lot Helmut!

[@soleilsoleil8287]

i like the videos and the way u explain i wish i could be an apprentice on the job with u are u in the states sir

[@acservicetechchannel]

The southern tip of NJ. I am mainly teaching now, thanks!

[@oswaldoquijano7375]

Amazing

[@alfonsolopez4763]

Good video, thank you for sharing

[@acservicetechchannel]

Thank you for watching!

[@trebrown8151]

Excellent video...👍

[@acservicetechchannel]

Thanks Tre!

[@anthonytortorice1264]

Another great video. Thank you for your help.

[@acservicetechchannel]

Thanks Anthony!

[@MrChipBryant]

Very good.

[@acservicetechchannel]

Thanks a lot Chip!

[@donio71]

Another great video !!

[@acservicetechchannel]

Thank you for your support!

[@JoeSmith-um2sg]

Proof is possible. Ask for it. -Corbett Lunsford

[@acservicetechchannel]

Yeah this way the customer is satisfied and not secong guessing

[@publicmail2]

Hello you have one of the best HVAC channels on KZbin! I have individual circuit amp draw app from emporia energy, so I monitor various breakers wattage. I have a 20 year old heil 3 ton heat pump that I installed myself and pride myself in the performance like SP of .3" WC on low tap vs .5 spec and very good power bills. Anyway, I noticed with cooling I get between cold day 2500 watts compressor vs 3000 hot day but heat pump mode is higher at 3200 watts, I believe it normal also heat pump mode watts move sinusoidally up and down by about 150 watts/ per minute almost like the outside TXV is modulating. Does this sound normal? Thank you for great channel.

[@acservicetechchannel]

AD, I wouldn't say that it sounds abnormal. There can be some fluctuation due to a few psi moving up and down from metering device modulation like you were saying and during heat pump mode, it may be running with a slightly higher compression ratio! That is awesome how you are monitoring all of it! Great job!

[@xtremecomfort7799]

Thanks!!!!!!

[@acservicetechchannel]

Thank you for watching!

[@ChiDraconis]

at seven minutes what me and most persons call _ground_ is actually *return* There is "neutral" which is center tap on 3-phase ~ not seen here; And there is the return path of power which is very commonly tied to an actual "ground" which is somewhere tied by conductor to actual earthen ground; Often the return is tied to ground in the panel - if not neutral will float compared to ground then you have voltage across chassis or cabinet to earthen ground The driven rod becomes corroded due to earthen currents and for some reason practice - code actually - has return path to the drop "bonded" to earthen ground which is driven copper rod - in most cases - or a flat metal conductor under bottom or power pole - this is run with #6 AWG and you can see it on many power poles; Seems the concern is if return is not bonded to ground charges can build inside the cabinet which renders the cabinet dangerous so they just tie everything to common ground;

[@alexramos1435]

Cool story bro

[@jackpast]

Nice video, Craig! But where exactly is the turboencabulator located?? LOL

[@acservicetechchannel]

That is back behind the heat exchanger. It takes a lot to get to them and they are rarely seen when you get there, ha ha! Thanks Jack!

[@omarperez9633]

Honeywell Building Solutions is looking grow its HVAC/Mechanical Service business in the SouthWest Territory. Service Journeyman, Serviceman, Service Apprentice, & Service Tradesman roles will be available. #honeywell #honeywellbuildingsolutions #hbs2020 #hbssouthwest

[@jmstew642]

How about testing pressure switch with mity-vac

[@nicolemastin4481]

What about water getting into gas furnace and shutting it down

[@hinojosa552]

Where can I buy the technik pro to check blower motors?

[@rocker8692]

Is a heat exchanger real expensive, so maybe its just better they get a whole new furnace?

[@omarrc9628]

what would make one section of the house vents smell like something is burning bu not other area vents?

[@alexramos1435]

Maybe something in the vent is causing the smell.

[@acservicetechchannel]

Check for possible dangers by doing a combustion analysis and measure for carbon monoxide. There may be something else that smells along with possible CO. It could just be something in those two vents though reacting with the heat but better check to be sure, thanks!

[@michaelmorassi4953]

Your book, that is mostly an air conditioning book correct???

[@acservicetechchannel]

Working with refrigerants, preparing systems for refrigerant, checking the charge, troubleshooting by reading the charge, airflow troubleshooting reading static pressures, temp rise formula , etc thanks

[@scientist100]

Is it normal that when the gas valve is connected, the voltage is not kept constant at 24 volts, just spikes and goes back to 0. When I disconnect it, the current is kept for a good 5 seconds (test mode). I'm thinking that the valve is causing the voltage to drop because it is bad but just wanted to know if this is a normal behavior, I would expect voltage, just no actuation but in this case, the voltage is dropped to 0.

[@Colt-wr6wx]

Ceramic flame sensors go bad alot more. They can even be cracked right out of the box

[@acservicetechchannel]

The silicon carbide hsi's do break quite often!

[@willardearl76]

Have you ever done a smoke pencil test while the blower fan is running and the inducer fan is not?

[@acservicetechchannel]

That is certainly another way to check. Sometimes the problem is the primary heat exchanger has pulled off a bit and is no longer sealing and it is not a crack in the exchanger, thanks!

[@willardearl76]

@@acservicetechchannel so is the only for sure true way to inspect is a year down and visual inspection? I never want to be the guy who sells what isn't needed.

[@proc7867]

Is your book focused more on residential ac or commercial? I know a lot of the “curriculum” will transfer between the two types, but just wondering.

[@acservicetechchannel]

Mainly residential single and two speed units but it goes over troubleshooting, airflow problems, all the refrigerant basics, charging methods, all the procedures to get a system ready for refrigerant. I would love to hear what you think about it after reading! Thanks!

[@atlante700]

The tech told me he need to replace inducer motor,because after running was hot the motor?

[@stevenbailey7656]

On a Bryant furnace can the wiring harness between the control board and the inducer control board go bad?

[@acservicetechchannel]

It could have a loose connection and it could also have a loose solder connection at the board. Anything is possible, thanks

[@cowmok]

Chances are the secondaries are failed on that Carrier.

[@acservicetechchannel]

That's a shame that heat exchanger material was used in the secondaries of the older furnaces

[@fixinggrace]

Some of the older Trane 90% units have issues with the cold header cracking. They still run but they leak water all over the place.

[@theairconditioningguy]

The links for videos you have in description don't work. 🙁

[@acservicetechchannel]

I just fixed them. Some were running into the next video title. Should be all good now, thanks!

[@theairconditioningguy]

@@acservicetechchannel Thank you!

[@johntrejo2522]

My furnace will run two or three times then stop for about five days or so. Says pressure switch an lock out on code. Any suggestions?

[@acservicetechchannel]

If it is a 90 percent efficient or higher unit, has the condensate drains and tubes been cleaned yet? I did a video on that as well as top 10 pressure switch error problems. Make sure to not put pressure on that pressure switch, only with a testing tool for that purpose such as the sdmn6 but it may just be the drain lines, thanks!

[@johntrejo2522]

@@acservicetechchannel yes it is a 90 percent furnace. An no the lines have not been checked. . The furnace guy we called said it could be the board, but can't guarantee that's the problem. I thank you for the reply, an keep up the good work.Thanks an have a good day :-)

[@RockoRocko-rz7kx]

Humidity or water in pressure switch tubing, or dirty fs assuming furnace filter is clean

[@Blindmans_challenge]

Flame rod? SMH

[@isabelluna4420]

I have a question...my gas furnance runs good but every now and then when it is very cold outside my furnance pilot will go out and not reignite..as soon as we lit the pilot it will turn on and stay on...I also noticed that there is black smog lines in the furnance..any ideas? I was tild that i need a new furnace

[@special_k-hvac]

Cold air drops and you may be back drafting and blowing out the pilot, also the flame sensor may be fouled, pilot could be blowing weak. A number of things could be going on. Really you should be calling a service company to come look and see if there is a reason for the failure

[@isabelluna4420]

@@special_k-hvac thank you

[@LeftsnRights88]

Would a Carbon Monoxide detector with a positive reading at a heat vent be proof enough for proving a cracked heat exchanger without actually locating the crack?

[@acservicetechchannel]

It certainly is something but for the customer's sake, whenever possible, try to go further so they know there is no question or second guessing, thanks!

[@brianholle9498]

Yes

[@special_k-hvac]

Also take into account that if there is a standard vent water heater nearby that if its not venting properly it could also be drawn into the return

[@FlyEaglesFly19111]

In its flash codes..check over each section of that code. Have well trained techs sent to repair issues..not just cheap labor with no experience! Problem solved

[@frankjames1955]

my fan is runing all the time under any setting after i changed the thermostat ... i put the old one back and still same problem, The error code green light flashes 4 times which means - LIMIT CIRCUIT FAULT − Indicates the limit or flame rollout switch is open." i took out the G and R thermostat wires from the control board completely off the screws but the fan kept blowing ..now im getting stumped

[@samhopkins7048]

If you have a service tech out there troubleshooting furnaces and he doesn't understand the basic stuff you're saying in this video, he needs to go back to being a helper. This is basic stuff.

[@narimantom6701]

This video is repeated 3 times