Understanding Flame Rectification on Gas Furnaces! Explanation, Testing, Flame Rod, Ground Issues!

In this HVAC Training Video, I Explain Flame Rectification on a Gas Furnace! This is the Flame Proving Process Using a Flame Rod. I show Multimeter Testing, Common Problems, Examples, and Ground Issues! 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 #flame #flamerectification #gasfurnace #furnace #flamerod #multimeter #testing
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[gregmercil]

I was incorrectly taught that the flame rod is a thermocouple and therefore was never really trained on how they actually work and how to test them beyond just checking the microamps they “produce.” This channel is a godsend! Absolutely essential for techs to watch, especially newer ones like myself. I’m going on two years working in this trade. Please keep them coming!

[robertray]

Everyone who watches you teaching should be very happy
Great teaching

[williamserver]

I have 23 years experience and just learned a few things. Thanks for the videos

[michaelrussell]

12 years I've been fixing Heaters and I've been checking this all wrong thank God for your videos

[wayneschneyer]

Hello Craig
As always, your professional and excellent videos are so valuable to the technician.
As a retired veteran of our industry, I learned something watching this great video.
Fantastic demonstrations that probably aren’t shown in trade schools, sadly. Your simply an Awesome gift to our industry!
Thank you again.

[jamesfitzsimmons]

You are a great teacher. Please continue with your videos

[dentonhess]

Excellent trainer. Doesn't get any better than this.

[justinrogers]

Im an HVAC tech and your videos are awesome, thanks for the content!

[deanmartin]

I did not realize the flame sensor had voltage running through it. Learn something new everyday. Great video Craig. Thanks for sharing.

[QualityInnEscondido]

thank you very helpfull fixed our water heater after watching this video thank you again.

[joshuaespinoza]

I'm definitely buying his books! I'm ready.

[maness]

Had no idea the flame rod has volts when the furnace has power at all times. The day is not wasted.

[zachosborne]

Good video man. I remember the first old rheem I saw that read micro amps through the igniter, it threw me tor a loop.

[qzorn]

Wow, the most best Furnace system walk around. 😎 Thank you so much. The flame rod circuit is very interesting. May be check the waveform out with an oscilloscope?

[johnconnor]

I will be testing some of these stuff in the field

[martynlewis]

Great video. I’m a UK based gas engineer (not the stuff you lot put in your cars, the stuff we power our boilers with, sorry, furnaces with) I haven’t found a trainer in my years working in the industry that can fully explain the rectification process. When you ask them their explanation turns a bit vague part way through and their answer usually contains the words “magic happens” 😂

[WillieMakeit]

looking forward to the mini split manual

[cliffweinan]

Excellent explanation. Low level DC flame sensor signal makes control board sensitive to AC power polarity because neutral is grounded at power panel. This can be issue if furnace unplugged and does not have newer polarized plug / receptacle pair.

[John-dpln]

Great video. Can you address why some furnaces won’t run when powered from a stand alone generator (during a power outage). I’ve found that the neutral and ground from the generator must be connected in order for the control board to allow the furnace to operate. This even happened in an older home with knob/tube wiring and no ground. I’ve had this happen on both inverter and conventional generators. Thanks.

[Pennconst]

Awesome video. Thank you for sharing the experience.