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

[@jimmyhelvig5609]

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.

[@acservicetechchannel]

Thanks for watching!

[@alfonsobenitez8574]

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.

[@samsonleung1708]

I like your microwave magnet.

[@JimEverette]

I changed the capacitor on my out side condenser fan , ac unit won't still start , thermostat Stat have battery,

[@thecreativehuman75]

You’re the best HVAC instructor on KZbin.

[@seattlesusan5464]

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.

[@jeffflindall7501]

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!

[@sunflwr729]

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!!

[@kleankash88]

UPDATE:1 year and still cranks within the first 2-3 pulls. Probably will buy another when this one finally does bite the dust kzbin.infoUgkx43QMbQqu67IZadu9ou8Sg1BdrunMRNqX . No issues at all. Very happy with it.UPDATE: After 6 months of use and over 70 uses I would still highly recommend this pressure washer. It does vibrate a decent amount but never had it “walk” like others have mentioned. No oil leaks, still seems to run like the day I bought it. Still cranks within 2-3 pulls every time. Very happy with my purchase!Have used it about a dozen times now. Plenty of power, cranks up on 1-2 pulls every time. My only complaint would be I wish it was a little taller to make it easier to walk with it (hits my ankles a lot) and that the two hose connections were a little further apart but it hasn’t caused me any issues. Seems to run a good 1-1/2-2 hrs on a full tank, overall a well built machine and definitely worth the money in my opinion.

[@shaniquabowden3638]

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!!

[@walkingdeadman4208]

Dont you hate it when it something easy like that . Its nice though

[@MLEB723]

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.

[@ryanchristensen4291]

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!

[@ontube781]

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 .

[@ranlitt3201]

My switch that should be closed has 2 wires connected that look like they were cut. Would that matter? I didn't notice them cut until a tech was here. Please answer? You show it at 1:24

[@drewhunter8615]

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

[@NapkinEdStern]

This video just saved me a few thousand dollars!

[@RobertFranklin-o1s]

Excellent video, 5 amp fuse saved me a service call! Thanks for sharing your knowledge !

[@randybirkeland3331]

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.

[@PBS-nm1uu]

C

[@Danny-fs1hk]

Thanks for that info!

[@Dremdude]

Saved me a service call. Blown fuse. Thanks very much

[@eappan100]

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

[@hammec111]

Thank you for making this Video. After my air conditioner would not start up, I followed your steps and traced back to power issues. I found a faulty safety switch with a float located in the pan.

[@dane1234abc1]

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.

[@alaaalshaikh369]

Thanks a lot I fix my ac because the fuse was burnt if I have to wait for my landlord to fix it will take weeks

[@MrFrenchHarp]

I want that magnet!!!! Tape gets old. Btw… 23 year Hvac owner here. Very concise video. Great information.

[@goodluckchuck]

Incredibly well illustrated, concise, and helpful. Greatly Appreciated Kind Sir!!

[@acservicetechchannel]

Thank you kindly!

[@djginza]

@@acservicetechchannel and a horrible 8

[@gregsewell0]

My girlfriend's furnace wasn't getting any heat. Her inducer wasnt turning on. A volt meter showed it wasn't getting any power. Another (different) video told me it was the HSI, so i replaced it. But that didn't fix the issue. Another video told me it was the flame sensor. I changed that too, and that didn't do it either. A third video told me to change the motherboard as the inducer and HSI weren't getting power. So I bought a new motherboard and changed it, but that too didn't fix the issue. I came across your video and learned in step #5 that weak batteries in the wall controller could be the culprit. Her house has two controllers, one upstairs, one downstairs. The upstairs wall controller displayed working digits in the display. Even so, I opened it up and saw that the batteries were corroded . So I changed the batteries in the upstairs unit. But that still didn't fix the issue, even though I cleaned off the terminals as well. The downstairs wall controller had a functioning display also. However, when I changed the batteries in the downstairs wall controller, the heat came on! So lesson learned, sometimes it's the simplest thing. My batteries had enough juice to work the display, but we're too weak to run the heat. Luckily for me all the parts I had purchased over these last two weeks, including the motherboard were returnable as I got them all on Amazon. Thank you for posting this video and helping me troubleshoot her issue, it saved my girlfriend a grip of cash on a service call.

[@goldfinch1384]

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

[@acservicetechchannel]

Sure, thanks!

[@joecostu1571]

Where is that p. S

[@matthewmenard3014]

You talking about the tube that measures negative pressure off the inducer motor? We call it combustion motor

[@matthewmenard3014]

But he is demonstrating why it won't turn on. The sequence of operation is another thing.

[@swimdadio4052]

Very helpful. Professionally done. Great job.

[@adventuresforall]

THANK YOUUU. I am not technically literate at all AND THIS helped me solve my issue without having to get my landlords involved and it saved them money! Thanks so much

[@Irwhodunit]

The only part I'm qualified to do is checking the batteries in the thermostat. It didn't help, but I'm making progress. Thanks for doing the video.

[@kcla83]

Thanks for the helpful video, replaced the fuse, works like a charm.

[@acservicetechchannel]

Excellent!

[@Frady505]

AMAZING video, thank you so much for taking the time to share your knowledge.

[@marcussmith5419]

Ur the best u have not yet fell me. I have read your book and it’s everything a technician needs to know. Thank you once again for sharing your knowledge

[@acservicetechchannel]

Wow, thank you!

[@kuchb01]

Been troubleshooting my furnace for several hours 12/30/22 into 12/31/22. Took the doors off earlier today for an inspection - didn't know that there was a door switch that was preventing my furnace from turning back on. When I finally realized the main issue was that the furnace was not getting any power (checked the on/off power switch, checked the breaker) but it wasn't until I found and watched first 1:25 before my problem was solved. Held the Door Switch closed with my finger, and vuolla! After about a minute the furnace was back to running like before. Installed the door and my next step will be to invest in a magnet like you have to hold that puppy closed. Thank you sir! Very much appreciated!

[@AZ_sunshine]

another great video. so happy i suscribed back when I first needed help. thanks for all your help and great videos.

[@rauledom]

Thank You! I did not close the cover properly when I changed my filter, your video gave me a solution. Thanks again!

[@Gary-ts6dh]

3:10 - No need to pull the fuse to check it: after verifying 24volts to the board, if you measure 0volts across the fuse, it is good: if you measure 24volts across the fuse, it is blown.

[@pauldembowski5465]

Thank you for that education that was straightforward I could totally understand what you were showing me and very thorough and simple. Well done!

[@beemikeme]

Very good teacher!

[@Alex-jo2oi]

Your videos are the best Craig. Thank you so much.

[@repairitdontwreckit4257]

I’ve watched most of your videos. They always have great, accurate content. Bought your book. Excellent reading. Well put together. I installed my own split ac system using your videos and book. Everything went smoothly. Thanks.

[@samuel4ya]

I’m oo

[@NorCal-refrigeration]

It’s coming into heating season and it heating video time and this is a great one. 🤘⚡️🤘

[@acservicetechchannel]

Thank you very much Nor-Cal! I appreciate it!!

[@jaime5659]

Q

[@hursutozkul1316]

Thank you. You saved me a few hundred bucks!!!

[@Peter-fu3fm]

Great videos! Recently I replaced a broken secondary fuse on the furnace and a thermostat for my Bryant Heating and Cooling System, and the LED showed a solid red light. However, when I tried to run it two days ago, the LED turned off, but the new fuse on the furnace and the new battery-powered thermostat, as well as the breaker for the furnace are still all intact. Could you give me an educated guess as what could be wrong? Thank you!

[@waltp3373]

Excellent analysis and explanation.

[@acservicetechchannel]

Thank you kindly!

[@calsa5542]

Thanks! Saved me a technician fee 🙂

[@MrTenaciousRob]

To the point and you helped me solve the issue! Thank you!

[@SaltySeed]

You missed problem #1.....what if the led light doesnt come on? Checked breaker, its on and fine. Pressed doorswitch, nope. Worst thing is furance is only 3yrs old and worked fine all last winter.

[@chriswebb810]

I had a tenant yesterday with no heat. Inducer fan ran, blower ran but the burner wouldnt ignite. I found a loose connection down at the blower. Im assuming a neutral. It was a small white wire wirenutted to a white larger wire coning off the blower

[@irishkevin4307]

great vid...like your troubleshoot display set-up. so much easier troubleshooting the older equipment when there was just a fuse/breaker, simple thermostat, transformer, oil burner, or gas valve...so much for new technology...!!

[@markbarber1920]

Great Video, what about checking the resets on the the limit and roll out switches?

[@armziusthezealot4072]

Great video and great explanations. Saved me...the door switch i never knew about and that was it! Thanks a lot

[@acservicetechchannel]

Glad it helped

[@union537]

I have a Goodman package unit that the brand new inducer motor fails to run. There is 240 volts at the L2 and black wire on the circuit board. When heat is called for the inducer motor will bump turn about 1/4 rotation then stop. What’s my next move in troubleshooting? Thanks for the videos and your time.

[@w1swh1]

My furnace stopped working and I checked everything (for days) until I realized the propane gas tank was empty😁

[@bradsteeves5403]

Got motor together furnace is in a cold room that what cools the gaps exhaust that comes out of the furnace is 76% volatile when the furnace that produces Heat sucks are the sewer line on the floor to stop making a positive and negative charge in the ions in the air which what allows the water to go out the tube instead of buildup in the combustion chamber

[@tomahawk5959]

Did you check the low frequency transmitter?

[@lausy3]

When turning on the heater on the thermostat, am I suppose to hear a clicking noise from one of the relays turning on? I am not hearing that on my control board.

[@_Antboogie]

Great video brotha

[@joeanonimous1105]

When I turned on my furnace on last night, for the first time since last Fall, it began to heat the house, then quit. When I went to check the thermostat, I could hear a series of clicks through the air return grate. I hear one click, then a pause, then two clicks in rapid succession, then a pause, then it repeats. Same thing after turning it off then back on. Same thing after it being off overnight. Does that symptom indicate any particular source of the failure??? Thanks in advance for any assistance.

[@paulcamalin5236]

Hi, Thanks for your great videos. I learned a lot from you. Will you please help me wit this issue. As I power on the furnace I get the error code 31 which is 3 short flashes followed by a long flash. Please see below for a description of the code. I know my the inducer is OK but it received not voltage and the pressure switch is also fine. Nothing happens not even any noise just the LED light. It can’t be any blockage because nothing turns on to sense that. What do you think I should check for? Thanks! 3 1 : PRESSURE, DRAFT SAFEGUARD, AUXILIARY-LIMIT (when used), OR BLOCKED VENT SHUTOFF (when used) SWITCH DID NOT CLOSE OR REOPENED - If open longer than five minutes, inducer shuts off for 15 minutes before retry. Check for: - Proper vent sizing and condensate pitch - Inadequate Combustion air supply. or sag. - Low inducer voltage. - Vent restriction or high winds. - Disconnected or obstructed - Defective inducer motor or start capacitor. pressure tubing. - Defective pressure switch or connections. If it opens after trial for ignition period, blower will come on for 90 second recycle delay.

[@paulcamalin5236]

solution: I replaced the control board!

[@leedempster4743]

Furnace isn't working. Also the AC isn't working I have a gas furnace. I hooked up a new thermostat to it but no power is going to my thermostat I also found out that the repairman who came and fixed it last time put a 5 amp fuse on a 3 amp motherboard. I cannot figure this out and I'm scared to call somebody else to charge me another $700 to break my stuff

[@jimmysegovia2688]

awesome!!!! i missed this one! thanks craig! knowledge is power.

[@acservicetechchannel]

Glad you liked it!

[@羽洛陈]

you are really nice .thank you so much

[@tribal21475]

2:22 What if i dont see voltage at all Do I have to switch the whole board? Or the wires?

[@cynthiafeinen2841]

Should start with the batteries in the thermostat. That anyone can check and fix. Unfortunately it was the last and after I panicked not having a voltage meter trying to figure out what I was looking at based on your pictures it was just the batteries. Thank goodness for that and thank you for number five telling me to check them would've caused a lot less anxiety. Had it been number one problem. Especially since I had no idea thermostat even had batteries. 😂

[@dreadone6894]

5:40 Reason #4 How to determine if the thermostat wires are touching or are Brocken ? Resistance ? OL ?

[@deffy750]

Just wanted to thank you so much sir I really appreciate all the info 👍 really helped me out

[@IFreshhx]

Some furnaces the Inducer isn’t the first to cut on sometimes it’ll actually be the blower motor if the system has to pre purge

[@elbo530]

Great video my friend!

[@acservicetechchannel]

Thanks for the visit

[@pizzle1011]

Very easy to follow, thanks again

[@acservicetechchannel]

Glad it was helpful!

[@joeydelmarsjr.646]

im a DIYer and you did not mention the start up sequence for each component when the furnace start up and which components are NO or NC

[@danschepperly]

pan full of water!!! thanks so much 🙌

[@robertemberton8190]

Very helpful, thank you very much!

[@acservicetechchannel]

Thank you for watching! I'm glad the video was helpful!

[@hkhsm359]

nice video. great knowledge. thank you for sharing.

[@acservicetechchannel]

Thanks for watching!

[@qzorn4440]

A most excellent video. Thanks.

[@acservicetechchannel]

Glad you liked it!

[@OG-Malinali]

So I have a brand new control board new transformer and thermostat. The cooling works fine but as soon as I put the heater on the fuse pops right away. What am I missing???

[@bhajansinghriar7020]

Thanks sir.Great diagnostic help.

[@acservicetechchannel]

So nice of you

[@gpsperez5193]

Hello I have a question i have an older model ruud furnace i don't have sparkon the ignitor i can smelled the gas , can hear the inducer motor when starts looking for solutions any advice thanks

[@rmeken]

Great explanation it will come in handy

[@acservicetechchannel]

Glad you think so!

[@lancerudy9934]

Thanks for all the great videos!

[@acservicetechchannel]

My pleasure!

[@xtremecomfort7799]

You are a The Man!!!!!

[@acservicetechchannel]

Glad you enjoyed it! Thank you for the support!!

[@oneofgodschildren]

2nd time in a month. Newer furnace and tstat. Why does this happen in the colder months? It quit on Christmas morning 2022 at 0300. Same thing today. It's 66 degrees in here and the tstat is set to 76. My dogs are happy but me not so much. Husband died in 2018 so it's been a struggle with something always. I can't catch a break. I'm looking for a new built home and I'm getting out of this doublewide.smh 2023 Michigan ugh..

[@mandarg3243]

Thank you so much, I followed your precise instructions and was able to figure out the fuse issue on the control board

[@acservicetechchannel]

You're welcome!

[@EvilJ069]

Danke! My problem was fixed by replacing two 15 year old batteries I didn't even know about

[@acservicetechchannel]

Nice!!!

[@whiteape151]

Thank you, you just saved me some money. A prong on my thermostat was mashed down. My brut of a hubby smashed it after replacing the batteries.

[@羽洛陈]

😬

[@jimbola77]

Awesome VIDEO PRESENTATION!!!! THANK YOU FOR SHARING!.

[@acservicetechchannel]

Thanks for watching!

[@moderator5558]

Greetings. Great video. Thank you very much. My inducer motor was starting, running for a few seconds, and then stopping before the burners were turning on or anything else. When I checked the voltage between wires R and C, as you mention at about the 5:00 mark of you video, the infuser motor started running and stayed on, the burners came on and the furnace appears to be functioning normally. My question is, "Why?" and my concern is that, because that was so easy, it won't be the permanent fix. Do you have any suggestions as to what I may be up against if it quits? Thank you!!!

[@SP-rz3tk]

I had this problem this morning. Heat would not start. Testing the voltages, I noticed the wires move. Hmm. Loose screw at the "C" terminal. I tightened it down, and furnace started properly through the cycle. Check your screws, maybe one is loose? Thanks for the video. Very concise and clear instructions.

[@moderator5558]

@@SP-rz3tk Thanks for your input. I appreciate you taking the time. This is not my problem. I have checked all those connections. I have also replaced the inducer motor. I'm becoming convinced it is the board.

[@davidlindgren7605]

It's not an infuser motor, but it has the crazy name of "draft inducer motor." I have no idea what that means, but it's so confusing I can understand why you didn't remember the name.

[@moderator5558]

@@davidlindgren7605 You are correct.

[@candyrussell298]

I have a whirlpool model number whgA100a46AI0 hvac 2 individual fan units outside two thermostats. My heat worked upstairs last winter. Now the fan blows cold air no heat

[@zackzarate]

GREAT VIDEO

[@sajjanlama1ify]

hay craig can you make vidio how to set up dip switches on furnace with manual please

[@argenismoreno8838]

Thanks for this Great video. 👏👏👏👏🙋‍♂️🇻🇪

[@acservicetechchannel]

Glad you enjoyed it!

[@druer_gsxr]

hi if the safety switches such as limit switch or rollout switch is trippes open will that stop the board from giving 120v? Im not getting power at the inducer motor on the board were the plug connects? thanks in advance

[@Redtooth75]

The board will still get 120 volts but will not power on the inducer or gas valve. Usually they set the blower to run continuously when that happens.

[@jerseyjim9092]

I have an old Weatherking with a fasco inducer 7058-0049. Is it possible to replace just the motor? It has 3 bolts attaching it to the main part of the inducer so it seems logical but I couldn't find the motor online anywhere.

[@MsPatriotfront]

Door switch at 1:09. Took me a day to figure that one out... Fast forward this video at your own peril!

[@howardharmon3451]

I’m showing continuity between all the leads in the thermostat bar?? What could cause this?

[@donnierobertson3088]

Great job and video

[@acservicetechchannel]

Thanks Donnie!

[@patriciawalsh5809]

thank you batteries in thermostat replaced now it is working

[@acservicetechchannel]

Glad it helped

[@MyEndlessTestimony]

I was so scared it was broken your vid was the only one that helped. I just didnt set the temp high enough lol

[@compscript7973]

I have no power to the inducer and the blower does not come on when set on fan mode. The thermostat is good and I have power to the board. my board is the 50a50-112. I am thinking the board is bad. I cant find a fuse.

[@wisdomwisdom817]

Awesome job thank you so much

[@MemeKing44]

great vid thanks!

[@thegreenteam9095]

Where do I put the dial on the multimeter?