top of page

How the Millivolt Gas Valve and 750mv Thermopile Work! Troubleshooting!

In this HVAC Furnace Video, I go over the Operation and Troubleshooting of a 750 Millivolt Gas Valve and Thermopile/PowerPile. I go over how it is Wired, what Voltages you should be reading while the flame is present and the voltages needed for the pilot valve and main gas valve to work correctly. I go over what to do if you are not receiving the correct voltages. If the pilot flame is engulfing the thermopile and you are not getting enough voltage to open the main gas valve then the thermopile may need to be replaced.

Most Recent Videos

How Flammable are A2L Refrigerants?
01:35
I Almost Lost an Eye! Story of How it Happened and The Importance of Eye Protection In HVAC!!!
03:00
Mounting Duct Hangers for Residential Crawlspaces and Basements!
01:57
In 2029, Only 30% of HFC Levels Seen in 2020!
03:00
Don’t Hold Yourself Back From Entering The HVAC Trade! Advice On Overcoming Doubt!
01:59
Protect Yourself & Your Future! Your Body Wears Down Faster Than You Think!
01:36
Gas Furnace Circuit Board Wiring and Operation! Gutted and Reassembled!!
31:48
It Is Not Too Late To Enter The HVAC Industry!
01:49

AC Service Tech HVAC Training is made possible by continued support from our visitors, customers, and support from these Sponsors!

NAVAC LOGO Black_edited.png
Accutrak Logo
TruTech-Tools-Logo-Main (3)[528].png
HavenRGB-FC w_grey horz.png

AC SERVICE TECH, LLC

Updates List

Thanks for submitting!

Thanks for all your continued support! I appreciate all the comments, questions, and responses that I receive from each of you. I look forward to responding to many more! If you have an HVACR related question, drop it in the comment section of one of the YouTube videos at the AC Service Tech YouTube Channel and I will do my best to respond.

 

For business related inquires email us at info@acservicetech.com

Check back regularly as we are always updating and improving this website!

© 2026 AC Service Tech, LLC.

bottom of page