How to Read Furnace Wiring Diagram

How to read a furnace wiring diagram. In this video I show how to "read" or follow the wires on a gas furnace wiring diagram. I go over a schematic diagram and a ladder diagram and explain how the different components get energized and it what order. The diagram I am using is actually a pretty simple one compared to many of the others out there. I selected this one because it would be easier to follow along on it. If you were out in the HVAC field though, preferably you should have the furnace operation manual along with the wiring diagram. The manual will tell you which components get energized, in what order, and how long they are energized for. As I explain in the video, the wiring diagram is not straightforward and unless you know how the furnace works, it will be very difficult to figure out the wiring diagram.
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🎞️ Videos Referenced:

How to Wire AC Unit:
AC Wiring Diagram Full:
Furnace Sequence of Operation:
Most Common Furnace Fix (Flame Sensor):
Flame Sensor Troubleshooting:
How to Check and Replace Ignitor:
10 Reasons Why Furnace Overheats:
High Limit Switch Stuck Open:
10 Pressure Switch Problems and Fixes:
How to Troubleshoot Pressure Switch:
Furnace Error Code Basics:
How a 2 Stage Furnace Works:
How to Check Furnace Inducer Motor:
Flame Rollout Switch Tripped:
Basic Thermostat Wiring:
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⚠️ Disclaimer:
This video is for educational purposes. All appliance and HVAC repair work should be done by a trained professional. Word of Advice TV is not responsible for any possible damages or injuries caused by the use or misuse of the provided information.
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#furnacewiringdiagram #howtoreadfurnacewiringdiagram #furnacewiringschematic #furnacewiring

[WordofAdviceTV]

➡ More Videos For Further Information:

How to Wire A/C Condenser Unit:
How to Wire Thermostat:
How to Wire Air Conditioner Compressor:
10 Ways to Splice Wires Together:
How to Read A/C Wiring Diagram:
How to Read Water Heater Wiring Diagram:
Basic Thermostat Wiring Diagram:
How to Wire Indoor Blower Motor:
How to Wire Outdoor Condenser Fan Motor:
Is Common and Ground The Same Thing:
Electrical Symbols and Meanings for Switches:
Ohm's Law Explained:

[muhammadahmadi]

I am an 18 year old service tech. Been working in the field for almost 7 months and yesterday I came across a problem where I didn't know what to do, and watching this video now I realize I might've ordered the wrong part 😁. Thank you for the very detailed explanation of the diagram. Will help me out a lot in the future.

[gaberuiz]

MY name is Gabe and 6 years ago i made a career change from installing Directv to AC Installer in Palm Springs California. Installing ac in the desert is hands down the hardest job I've ever had seen that furnace coils are in the attic so to change one out takes a good 6 hours at about 130 degrees. It isn't for everybody Ive recently switched from install to service and i have learned more from you and your videos than i did at the technical school i went to. You make it very easy for me to understand and I'm really impressed with how knowledgeable you are at such a young age. Good job dude and keep up the good work. You probably helping people more than you know.

[is-chitown-rael]

I went to Coyne institute here in Chicago I'm not in the field but I understand it better now looking at your videos I graduated with all my certificates but didn't have time to capture everything like I should or would have liked i couldn't let all that money go down the drain so I was focused on just passing for the most part, thanks for taking time out your life to teach, YAH is going to bless you for this, SHALOM

[Ed-dero]

I just came across your video and I must say that this is one of the best videos I have found. Very well explained in great detail. I learned a great deal from this video. I'm looking to replace my one stage for a two-stage furnace. Thank you for sharing your knowledge with us.

[navida]

This is a great and detailed way of going through a furnace wiring diagram. I really appreciate it. Thank you.

[joseamilcarlopez]

Love the way you teach! I’m sure many of us will learn a lot from the amazing way you lay out your lessons.

[RUDONODO]

Well, very well! This is the more illustrated and understanding troubleshooting tutorial I’ve ever seen. Thank you so much for kindness snd your valuable time.

[TheFilthy]

Great video !!! I actually followed the flow and logic on what turned on and why ! Thank you so much for explaining how each stage turned on and off as heat or cold is called for.

[chonyima]

Oh my gosh this guy explained way way much better than my hvac collage teacher..

Thank you so much for doing this video. Every time i try to read one of these I get so intimidated. This helps a lot!

[jimmy]

Yes, you did a great job to create this precious lesson for everyone.
Would like to share with your audiences. (free free to edit as needed.)
I resolved my Furnace problem without changing a part but fix an open in the 6-wire thermal state cable. Without your lesson, I would have no idea how to track and judge where is the problem but changing parts.
It's an 93' Comfortmaker gas pack. Problem starting 3 yrs ago, getting worse until this winter it finally wont ignite at all, March-2023.
At beginning, symptom happened only in very cold weather, around 30-35 F. It resumed functioning after I cut breaker off for 5 - 10 minutes, and it would last the whole winter.

It got worse year after year, more frequently, yet trouble happened in the same temp range.
I checked and suspected all Limit switches, CS-IM, and even transformer.
Ordered those parts to "give it a try". While waiting the delivery, I watched your video and it opened up my brain with accurate knowledge.
I started all over previous checking steps, and identified "the thermal state signal was not present at control Bd terminal." I removed thermal state from wall and connected close to gas pack side, finally, narrowed down to the point -"white line" was open.
Issue fixed and I can enjoy a warm sleep for the weather supposed to be cold again around 28.
Thank you

[fortunatedad]

This is an awsome explanation of the sequence of a furnace! I have my B Gas and have limited experience with furnaces, but this really helped give me confidence in being able to diagnose a furnace. Thank you very much!!

[karlosdozxa]

Excellent and simple understanding for home owners.. thanks a lot.

[FullyLoaded]

Excellent! Good way to speak clearly with good tone to keep attentive but not too cheesy lol. Love the pictures you used to follow along (real world examples) and the color code helps too of course when using the blueprint drawing to detail circuit logic and current travel paths. Helped me a lot and was a review for me, will be checking out the other topics listed in the description thanks.

[weslawsonsilverback]

Dude, you are SO underrated, u should have millions of subscribers. You are detailed and concise, even a high schooler can learn plenty from you bud!

[mohamedfadoul]

really your illustration is benefit full God Bless you

[sepehryazdani]

Thanks for sharing your knowledge and experience, a rare feat these days.

[habtamusium]

Every thing lovely explained ! thanks for this Methodology

[barrymckauckner]

I am a g2 gas fitter and this was a very helpful video! Keep up the great work