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

[@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.

[@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,

[@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.

[@thecreativehuman75]

You’re the best HVAC instructor on KZbin.

[@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!

[@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.

[@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!!

[@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

[@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.

[@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

[@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.

[@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!

[@todaywithtom]

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

[@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!

[@goodluckchuck]

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

[@acservicetechchannel]

Thank you kindly!

[@djginza]

@@acservicetechchannel and a horrible 8

[@NapkinEdStern]

This video just saved me a few thousand dollars!

[@Dremdude]

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

[@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

[@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.

[@eappan100]

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

[@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.

[@user-hl9hb9wf9o]

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

[@MrFrenchHarp]

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

[@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!

[@swimdadio4052]

Very helpful. Professionally done. Great job.

[@drewhunter8615]

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

[@kcla83]

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

[@acservicetechchannel]

Excellent!

[@rauledom]

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

[@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

[@5452347]

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

[@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

[@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!

[@waltp3373]

Excellent analysis and explanation.

[@acservicetechchannel]

Thank you kindly!

[@Alex-jo2oi]

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

[@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!

[@calsa5542]

Thanks! Saved me a technician fee 🙂

[@w1swh1]

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

[@MrTenaciousRob]

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

[@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

[@robertlongoria765]

Thamks.

[@jimmysegovia2688]

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

[@acservicetechchannel]

Glad you liked it!

[@user-rq8ig9sv9y]

you are really nice .thank you so much

[@hursutozkul1316]

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

[@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

[@AZ_sunshine]

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

[@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. 😂

[@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...!!

[@pizzle1011]

Very easy to follow, thanks again

[@acservicetechchannel]

Glad it was helpful!

[@robertemberton8190]

Very helpful, thank you very much!

[@acservicetechchannel]

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

[@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

[@qzorn4440]

A most excellent video. Thanks.

[@acservicetechchannel]

Glad you liked it!

[@bhajansinghriar7020]

Thanks sir.Great diagnostic help.

[@acservicetechchannel]

So nice of you

[@EvilJ069]

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

[@acservicetechchannel]

Nice!!!

[@hkhsm359]

nice video. great knowledge. thank you for sharing.

[@acservicetechchannel]

Thanks for watching!

[@_Antboogie]

Great video brotha

[@patriciawalsh5809]

thank you batteries in thermostat replaced now it is working

[@acservicetechchannel]

Glad it helped

[@zackzarate]

GREAT VIDEO

[@rmeken]

Great explanation it will come in handy

[@acservicetechchannel]

Glad you think so!

[@markbarber1920]

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

[@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!

[@wisdomwisdom817]

Awesome job thank you so much

[@qcitizen6738]

Excellent.

[@acservicetechchannel]

Thanks for listening

[@deffy750]

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

[@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

[@lancerudy9934]

Thanks for all the great videos!

[@acservicetechchannel]

My pleasure!

[@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.

[@user-rq8ig9sv9y]

😬

[@ogyywinn6035]

well explained

[@acservicetechchannel]

Thank you!!

[@jimbola77]

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

[@acservicetechchannel]

Thanks for watching!

[@elbo530]

Great video my friend!

[@acservicetechchannel]

Thanks for the visit

[@MsPatriotfront]

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

[@aprendamosconreneamaya725]

Thanks

[@acservicetechchannel]

Welcome

[@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!

[@donnierobertson3088]

Great job and video

[@acservicetechchannel]

Thanks Donnie!

[@pk7580]

Very nice video. Thank you!

[@acservicetechchannel]

Many thanks!

[@xtremecomfort7799]

You are a The Man!!!!!

[@acservicetechchannel]

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

[@kevinheimer]

My Goodman Gmp 100-5 gas furnace started up and worked fine as usual for a week or two this fall and then went dead. Totally dead with no sound, no inducer start up, nothing. Took off covers, pushed in cover switch and checked error code on main board. 3 blinks. This means pressure switch malfunction. Since I'm not HVAC trained, and only partially understand the actual sequence of operation, I got sidetracked and misdirected and began checking all the pressure switch videos. KInda dumb since obviously if the inducer motor isn't working (first step) then the pressure switch (2nd step) can't work. The point is that error codes are helpful but you have to be aware of how the system actually works, step by step, or you can waste time, like me. Anyway, after I took a break I realized I was barking up the wrong tree and started to focus on the inducer moter itself. Luckily found this AC Service Tech video. Great info! I'm no electrician either but after watching the video, checked voltage at pressure switch while trying to start furnace and only got momentary 24v so I tracked the pressure switch wires back to the main board. They both are right next to two relays and when I tapped one, the furnace started up! Tapped it again and the furnace shut down. Bad relay. Never would have found it without watching this video first! So I need a main board which runs around $130. but at least I definately know 100% that ordering it will solve the problem. Looks like a no-brainer to pop off the main board and plug in the new one. And to all you HVAC pros laughing out there, at least I knew about the back cover switch! Thanks again AC service guy! I subscribed to your site for the next time this POS Goodman goes south on me.

[@manuelesquivel6153]

Wow yeah of course its really helpful thanks ,

[@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

[@tomahawk5959]

Did you check the low frequency transmitter?

[@dreadone6894]

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

[@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.

[@MrCeora]

My furnace wouldn't turn on, and I realized that the problem started after I had changed the thermostat batteries. Checked the thermostat wiring and thought that the excess dielectric grease that was on the male and female terminals was causing a problem, then realized that because of the awkward location where the thermostat was mounted, that the display portion of the thermostat hadn't fully seated all the pins. It allowed me to run the fan, but not run anything in auto, therefore no call from the thermostat. Motto: Make sure the face plate is fully and evenly seated.

[@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

[@argenismoreno8838]

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

[@acservicetechchannel]

Glad you enjoyed it!

[@PBS-nm1uu]

how can you tell which relay control what, again love all your videos

[@acservicetechchannel]

If you really wanted to know, you would need to follow the solder lines on the back of the board, thanks!

[@tedspradley]

The capacitor is a 3 mF (for micro Farad) capacitor not 3 uF. The Greek letter “mu” ‘μ’ (see how it looks like a cursive lower case ‘m’?) is used in engineering when designating micro measurements.

[@tonypointer7026]

Very good video

[@bradsteeves5403]

And it works fine

[@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..

[@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.

[@sajjanlama1ify]

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

[@MemeKing44]

great vid thanks!

[@Rick-tb4so]

Great video..

[@acservicetechchannel]

Thanks for the visit

[@5863carlitos]

outstanding!!

[@acservicetechchannel]

Carlos, thanks so much!!!

[@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.

[@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

[@thegreenteam9095]

Where do I put the dial on the multimeter?

[@zekenzy6486]

Great Video. Have a nice weekend. Thank you for sharing ^_^

[@acservicetechchannel]

Thank you! You too!