Gas Furnace Won't Turn On? Nothing Happening? 8 Reasons Why!

In this HVAC Training Video, I Show 8 Reasons Why a Gas Furnace Won't Start Up, Won't Come On! I Show the Troubleshooting Process Step by Step! 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 #gasfurnace #reasons #furnace #stepbystep #operation #troubleshooting
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[jimmyhelvig]

You guys are awesome and very thorough. I’m a 5 year HVAC TECH, installer and maintenance guy and I’m still learning every day.

[alfonsobenitez]

You are a wonderful technician, I am retired license contractor and enjoyed watching HVAC videos. Still do some work here and there. Only have my right arm, but that doesn't keep me from doing my work. Thanks a million. God bless you.

[roelcruz]

This is the best video I found regarding this issue. I ordered a inducer blower yesterday ran me about a 100 on Amazon. Cross my fingers🤞🏽

[thecreativehuman]

You’re the best HVAC instructor on YouTube.

[seattlesusan]

I switched on the thermostat and immediately turned it off. That action killed my furnace. Thanks for showing the black smudge in the center of the blown fuse which helped me identify the problem. A quick trip to Autozone for a 3 amp blade fuse and now my furnace is back in business.

[sunflwr]

Thank you!! Within the first minute you provided the reason why my furnace was not turning on. I thought I'd have to call the company that installed it (which I dislike) and pay them for the visit. I appreciate this!!

[MLEB]

Best HVAC Troubleshooting video I've seen in a long time...I'm here because my Rheem Furnace does nothing, the fan won't even come on when I turn it on at the Thermostat...You gave me a lot of things to Check...Thank You.

[shaniquabowden]

Thank you so much! I've been watching videos all night and in the first 2 minutes you fixed my problem by telling me about the door switch! OMG! I almost slept all night in 8 degree weather. And your video was the only one that mentioned the gas switch, which was my original issue. But while troubleshooting, I left the door open. Thank you so much!!

[jeffflindall]

My furnace was not working. I had no clue what to do. Went through your video and managed to get my furnace working! Thank you for taking time to make this video to help people like me!

[ontube]

I'm in HVAC and have experience but still watch your videos. They're very helpful to keep a refresher and keep you away from bad habits

[todaywithtom]

One of the best videos of this type I've seen. It's good for both novices and experienced technicians alike .

[ryanchristensen]

I really want to thank you I am a 22-year-old I own my own house and it’s people like you who make that possible. My furnace wouldn’t light and thanks to this video I found out it was a bad transformer and repaired it!

[Ryan-mssn]

Batteries got me. Super corroded. Almost embarrassed, but glad it was an easy fix. Thanks for the video

[FOTOFOTA]

Thank you very much. You saved me from the Scamming technicians. My thermostat batteries were corroded real bad.

[drewhunter]

Thanks for video! Made me look like a hero to my little girls.

[eappan]

Very good narration, precise with all necessary details to troubleshoot the problem!!

[randybirkeland]

Good troubleshooting Craig. As a master electrician, I have one tip though. Some naturally assume when they have a 0 volt reading that there is no "hot". It could also be a faulty neutral. At 8:02, you are checking the inducer fan supply by probing the hot terminal and the common neutral point. More accurate would be to check both the hot and the neutral right at the connector plug. This insures you have not lost your neutral between the common point and the connector plug.

[daneabc]

I have another reason for your list: I had a HVAC contractor who shall remain nameless install a new 90% condensing furnace and new central AC system in 2015. Worked great. In October 2018 it finally turned cold, and I switched my thermostat from "cool" to "heat." Could hear the blower come on, and the furnace's high voltage igniter cycling, but the main burner would not come on. Called HVAC contractor who installed, and with which I had a "priority customer" annual maintenance contract. Sorry, they couldn't send anyone to my house because my area was under wild fire "warning evacuation." So suffered through 5 days of no heat until evacuation warning was lifted. When tech finally arrived, took him about 3 minutes to discover that a slide switch behind the furnace cover that controls power to the solenoid that allows natural gas to flow to the burners was in the "off" position. I didn't even know such a switch existed. Apparently the tech who did my annual maintenance check earlier in the year for some reason left the slide switch in the "off" position. Got a profuse apology, and I expect that the tech who did the annual check up is still getting razzed about it.

[goldfinch]

Another problem you could have is a bad pressure switch or clogged air tube for the switch. Great explanation.

[NapkinEdStern]

This video just saved me a few thousand dollars!