How to Test Pressure Switch on a Furnace

[@unclefreddy2009]

Wow such a useful video. The reason it’s so different in my opinion is that you explain all the other systems and how they relate to the switch. You talk about the process, etc. most other videos strictly stick to testing the switch with no explanation of what it does or how it relates to the whole system

[@felixx2381]

I have an issue with my furnace the igniter coil is not getting hot everything sounds to cycle but I test the line for power to the coil and nothing.. also the code it’s giving is 3 blinks of witch is a bad flow but I checked everything and nothing seems to be blocking the flow of air . I changed the circuit board . And thinking of changing the coil and pressure switch .. if you have any advice I would appreciate it .

[@danieldelano9892]

I spent my last ten years of working doing hvac trade, I wished I had found your videos back then. I would have been such a better tech. No one would invest the time to explain issues the way you do. You are doing a great service for all techs out there and then some. Thank you.

[@beerdonk]

Hey guys, our furnace was running today but no heat. When I checked everything, I noticed one of the wires connected to the pressure switch wasn’t plugged in. When I plugged it back in, the heat came back. Would that have caused no heat? I’m still not sure why the wire was disconnected.

[@BishopsPlace]

They most likely didn’t explain the issues because they weren’t knowledgeable themselves. Not all technicians are equally knowledgeable.

[@williamsmendoza7954]

Hi I can't find the exact pressure switch for my can I hit an universal switch. The serial for mine is FS6633-1488 and is a .41 wc of.

[@tewoldedesta]

Wow amusing practical explanation.

[@hvacdoc2338]

I’ve been in the HVAC field for 27 years... I must say that’s a great video

[@WordofAdviceTV]

Means a lot coming from a veteran in the field! Thank you!

[@rogerhallau5284]

I had a bad pressure switch a few years ago & I blew on the hose & sucked on it . I got the switch to work again but like you said, I went ahead & replaced the switch. No problems since. I watch all your videos & have saved a lot of money by doing the repairs myself using your videos as a guide. Great job!

[@hamdye.870]

As a novice in HAVC repair , I really appreciate Jay you making those awesome, clear and simple videos. Thank you Jay!!!

[@darksiderydah2721]

I am an hvac technician and this information never gets old. You should not become to complacent because that is when you make mistakes. This is a well done video with great troubleshooting. Good job

[@dmace3597]

Thank you thought it was a pressure switch problem until I watched one of your videos I opened the sealed combustion plate furnace started up and cleaned the intake tube and discovered 2 died mice blocking the intake. cleaned and furnace started right up.Saved me $200 plus thank you again.

[@Oscargrajales5720]

This guy explains things so easy, more than my instructors, really smart guy. Thank you for the videos.

[@WordofAdviceTV]

You're welcome! Glad to hear the videos are helpful :)

[@dougdeming6739]

Wow, you video just helped me fix my broken Carrier furnace. The problem was error code 43, known as "Low-heat pressure switch open while high-heat pressure switch is closed". I followed your instructions and determined the pressure switch was working. Then I disconnect the tube from the switch and followed it up to the burner chamber where I found 2 very dead mice clogging the intake funnel for the pressure switch tube. I carefully removed the mice pieces with a vacuum and the furnace fired right up! If you use a vacuum, be certain to disconnect the tube from the pressure switch so the vacuum doesn't blow out the switch. Thank you very much for sharing your expertise!

[@stalkerchanning]

I used this video and your 10 pressure switch problems video and was able to diagnose and replace our pressure switch. Thank you for explaining how it all works and showing the detailed steps.

[@izaiahkelemen6112]

Thanks for the video. Huge help. About 2 hours ago I had no idea about this order of operations about the inducer motor, pressure switch, and igniter. Just tried turning on my furnace to test it (it is almost 24 years old) and no go. Inducer came on, but nothing else. Well i work on trucks for a living and have no experience with house hvac systems. This video helped me to solve the problem. Pressure switch was not closing when inducer motor kicks on. Tested it by blowing in it, working as it should. Found plugged fitting where the hose goes in by the inducer motor. Cleaned it out and got her flowing. She fires right up now.

[@kdcnh99]

Dude, you are a Godsend! House was 48 degrees last night and 40 degrees this morning - and it's 20 degrees outside in the middle of New Hampshire winter. HVAC repair companies told me they could come out in about 7 days to take a look. Thanks to your excellent videos I took my time watching them, was extra careful with turning off power and not touching anything with the power on (other than with meter probes) and found and fixed a flaky pressure switch. House is back to 68 degrees again. Thank you for your excellent videos!

[@WordofAdviceTV]

Wonderful! Love to hear that you were able to find and fix the problem! God bless you and yours, stay warm!

[@alextoufanpur1212]

YOU ARE SIMPLY THE BEST! May the joy of the Universe be with you at all steps of your life! Very educational and kind of you!

[@gregpost3320]

Solid advice given on this channel. Just saved literally 100's. Once I understood how PS work after your explanation, I went down and started eyeballing the situation on my newly installed furnace. Turns out the line from the inducer to the PW had come off. Re-installed and presto. Hot air. Thanks for much.

[@jerryandruth]

Great video. My home gas furnace would not ignite. I watched several of your related furnace diagnostic videos. I fixed it myself. One of the pressure switches was stuck. I simply blew softly into the tube until I heard the switches click. This fixed the problem. The furnace lit right up. Amazing. Saved me time hassle of calling a repairman, and probably over $200. You are doing a great service. JerryK..

[@gregdoh]

Thank you for the mentioned to trying blowing on it. The heat was not working at my business this morning and the unit said "pressure switch closed". I contacted my landlord to get someone out here ASAP then watched your video, decided to try blowing and tapping on the switch, and got it working again. Of course, someone will still come by to check things out and maybe replace the switch, but at least we are able to run our business until that time comes.

[@oscarestrada5509]

Iam a service tech , I have 10 yrs doing this job, but I still like to learn from other people. I do comercial and residencial this guy is very smart and explan well . Jeep it going with your vídeo and good luck.

[@astritzyberaj6132]

Just came to this site randomly, but I must tell you that you explain this very well and I don't know much about hvac..anyone with little knowledge and follow your instructions can make some of repairs themselves..Thanks

[@oscarestrada5509]

Your are doing a good job,I have 6yrs on hvac and till learning from your videos thanks for your tips

[@willgreen5023]

I am not a HVAC person at all, but this video is great. I just removed the inducer motor components from my old furnace and I was wondering what that circular metal thing did. One search of the part number told me it was a pressure switch. Then, my second search for how furnace pressure switches work lead to this great video.

[@smborum]

You're a natural teacher. Good video.

[@WordofAdviceTV]

Thank you! Glad you liked the video!

[@kylelove927]

HVAC isn't my line of work but I do greatly appreciate and enjoy your instruction. You're a smart guy and you do so well at explaining things.

[@WordofAdviceTV]

Thanks Kyle! Glad you like the videos!

[@Wmahoney19781]

I've been in HVAC for 27 minutes but a DIY'er from birth and want to say the same as HVAC Doc. Good instructions and follow-up.

[@yoshioramirez9983]

Thank you so much. I just got EPA CERTIFIED and looking to get into the field. I confess I'm lacking confidence but videos like this help a lot.

[@pqgscott]

I have been dealing with a no heat issue for a few days now and all research related to my issue was useless and then I found your videos and now I know my issue is with the pressure switch! Great job on your videos and I'm sure I'll be watching more of them

[@WordofAdviceTV]

Glad to hear you were able to narrow down the problem! Good luck with the rest of the repair!

[@gilliecalifornio9537]

Awesome HVAC instructor 👨‍🏫 I always enjoy watching your tutorials- keep rockin the HVAC world.

[@WordofAdviceTV]

Thank you! Glad you liked the video :)

[@PatricksDIY]

THANK YOU, you saved me so much Money! I could not figure out why the furnace was not igniting, everything tested out okay, until you said " Blow in the pressure switch tube" I pulled mine off and somehow the inducer end of the hose connection had a piece of rust stuck in it. I got it out, connected the hose back up and Viola! I had heat again. So again Thank you very much! I was at the point where I was about to call an HVAC tech, because I will not mess with any of the "gas parts" just checking connections, igniter ect.

[@piranhaa2]

Such a helpful channel. I saved having to have another service call out to fix what ended up being a plugged pressure switch hose. The furnace was intermittently cycling after a few minutes for months, without any error code (thanks Lennox). I finally I got a pressure switch error code, which ultimately got me checking the switch voltage + hoses and it fixed my issue. Thanks so much!

[@Dronerangers2024]

Thank you!! Had 3 flashes on the LED. My pressure switch was stuck open. I tested it for continuity and found it was definitely open. Made sure nothing was blocked. Still wasn’t working. Took tube off and sucked the switch open and closed a few times and that worked!! Ordering a new pressure switch.

[@Dronerangers2024]

Should add it’s a Heil 75kbtu single stage

[@shawnbaird2015]

I had a service guy come out, told me i had a bad motherboard-after he blew my home circut..??i told him to leave my home!! This guy does a wonderful job! Should teach tech class!

[@tkstravels]

I love how you explain checking the first pressure switch, seems like you need to go one step further and explain when to check the second switch if the first switch checks good..... Thanks

[@BeeBombard]

Dude I’m a plumbing and heating technician. I’ve learned more from you then any of my trainers over the years ever taught me. Don’t get me wrong I pretty much know my stuff but there are tips and tricks you’ve shown that has helped me out a lot. Question which hvac tool bag do you use? You should do a video on that. 👊

[@keshaunlewis9825]

Thank you for this video. I’m currently at Hvac student. I got to take an electricity class the Classroom won’t do much justiceI’m more like a hands on visual learner. I can repeatedly watch this video over and over to know how to troubleshooting and tell if not the pressure switch is bad

[@cjMbuck]

I've watched several of your videos. All are well laid out, explained, and easy to understand. Thanks.

[@kba95630]

You're a great tech, but more importantly for this purpose, you're a great teacher and videographer. Saved my freezing cold butt and made my wife think I'm a hero! Good tips you gave me: 1) Easy peasy on the suction when testing the pressure switches. The suction created by the inducer is way lower than what you can generate manually. 2) Don't jumper the switch until the unit kicks on and has gone through its self-checks. I never would have considered that. 3) My problem was not the switch. Your videos prompted me to consider the exhaust tube going up through the roof. I don't know what was in there. Vacuum didn't bring anything down, so I reversed the vacuum hose and blew it out. I have no idea was was in there, but once I did this and put it all back together: HEAT! Glorious heat! And just when I was about ready to start burning the furniture too!

[@WordofAdviceTV]

Your comment was both informative and entertaining! I appreciate you taking the time to leave a comment of your repair highlights! Hopefully no more troubles with the furnace for the next 20 years now ;) Stay warm!

[@sethhowell7331]

Dude!! Thank you!! A rat chewed a hole in the vacuum hose right at the draft motor. Cut off the end and the heater works great!(i sucked on the hose and the multimeter continuity test worked fine. Thx.

[@ralphruiz1066]

Thank you so much for your videos they really help me out a lot for a new tech in the field.

[@PawsumGaming]

I kinda ended up in HVAC training a couple months ago just out of the blue, and this is exactly the kind of stuff I've been dealing with the last few weeks.

[@Vlican]

new homeowner here trying to tackle HVAC... i must say you've got the best residential HVAC videos on youtube! you make everything so easy to understand. i thank you for doing these!!

[@sosantana8249]

I'm an HVAC student and I just want to say that you broke this down better than my instructor. He's a great instructor but the way you explain everything makes it way easier to understand. I liked and subscribed! Thanks for the videos!

[@donaldp7520]

thank you. understood, this is the second reply, the person that reply the first time was upset and sounded like they were answering a different question. deathangel is unknown to me. but the answer sounds like it came from the clear thinking young man on the video how to test pressure switch on a furnace. I now understand the events after the thermostat calls for heat. Having the devil to find part numbers for 15 year old coleman furnace. thank you again.

[@roodedave]

I am a plumber as well spot on my friend quick and easy explanation 👍👍

[@alexc9777]

How lucky I am as a new tech to have tutorials like this.... It must have taken much longer to learn all this information before HVAC channels like yours came around. Thanks for all content! I try to learn as quick as I can in the field... but as you know things are usually done quickly and explanations to apprentices are usually understandably short and condensed... if at all... These videos are great for reinforcing what I have learned in the field but at my own pace.... Your channel seems to have a video on almost every topic I need to learn about...

[@WordofAdviceTV]

You're welcome! I'm glad to hear the videos are helpful! I know what you mean, no matter how fast you learn, it still takes a few years to become comfortable with HVACr repairs. Everybody is a beginner at one point. I was lucky and had good mentors at my second job but on my first one, the explanations were brief and incomplete like you mentioned so I'm happy to be able to help new techs with my videos!

[@neilyakuza6595]

Great videos. Your tutorial helped me out when even the tech could not figure out why the furnace would not kick on. When I watched your video it ended up being a plugged nipple where the hose from the pressure switch was connected to. Unclogged the nipple, and voila furnace has worked since then. Awesome vids, I can't thank you enough on explaining how the whole system on the furnaces work. Last note: the tech said he was going to order a new board for the furnace, your video said that if the board was out there should be some burn marks somewhere, there was not any. This got me to thinking it was something far simpler that caused the furnace not to kick in. I was always taught to start with the simplest solutions first. Anyways you saved me at least 700 bucks!

[@WordofAdviceTV]

Awesome! Glad to hear my videos helped :) Kudos on getting it fixed yourself! (By the way, thought I would mention it just in case.. There are times when there are no visible defects or marks on the control board yet it is still bad but yeah, many times there will be a burnt mark) And I very much agree with your last statement! Gotta start with the simplest solutions first.

[@virbone7141]

Excellent demo , with lots of knowledge with practical experience above all your hardworking to be in detailed information to your viewers, thanks

[@samray5634]

Man u are awesome, great informative video Clear and concise your efforts make the world a better place to live in and that inspires me I live on a fixed income and have no money for home repair i live on a subsistence level income It's just after 2 am , and with the information you shared I now have hot water to do dishes and shower You could have held that information for a ransom and called it a service charge but instead you share it with all of us And I appreciate that oh, you gave an old man peace of mind and Blissful rest thank you

[@classic287]

Nice 👍 to watch a video with good audio. I’m hard of hearing, but you speak very clearly, so I can hear you just fine. Thanks

[@classic287]

By the way, I subbed...

[@WordofAdviceTV]

Glad you liked the video! And thank you! I hope the future videos won't disappoint!

[@Myairmech]

Great video. I like watching videos like this for refreshers, and like other comments. I’ve never been explained certain things. Cheers.

[@jessemurray1757]

i was getting a pressure switch error code so i came across this and started diagnosing. It started working again......great.....now it'll go out when we really need it.

[@mannyperales8391]

Excellent troubleshooting...switch ohmed out well..but was not transferring the load..I tapped on the switch and immediately dropped from the 28 volts to zero.then ignitor glowed...excellent videos..thank you

[@spm5a]

Thank you my switch was intermittently not working. No voltage or continuity. I then watched your video about bypassing the switch and the furnace turned on!

[@jeffcibulka4186]

Excellent illustration. Thank-you

[@sergioparedes2886]

Thanks for the amazing videos I’m getting ready for my 1st cool season of work

[@royalserviceairconditionin2703]

We thank you for your all amazing videos, you are awesome.

[@ja8570]

Excellent, just excellent concise information here!

[@SwimmingintheDeep]

You are an excellent teacher.

[@32patojo]

Thanks for sharing all this videos about gas furnaces. Yesterday dec. 26 I fixed my sister's gas furnace, the problem was that switch, it was open, I read the code and led me to that issue.

[@leelee287]

A real trained professional gas fitter hvac tech never goes by what the furnace board say instead we go by sequence of operations. Next time leave it to a professional not trying to be rude but as you said it's your sister's house and messing with a potential dangerous methane ran appliance could be extremely dangerous

[@32patojo]

@@leelee287 I studied HVAC, I know how to do it, I dont do that for a living, but I have experienxe in electric heater no gas at all. If the board is giving you a code you have to go and test that part, it doesnt make sense to be testing all the parts when you have a code already.

[@leelee287]

@@32patojo then you really dont know what your talking about . Seriously but it is what it is and obviously you know what your doing right . Reading a code on a furnace and being able to diagnose a furnace e properly are two different things believe me. Or any Tom dick or harry can go around fixing furnaces. Anyways dont want to make this into a back and forth thing . You do as you please

[@deanburke3041]

Resistance, voltage (0), or closing pressure. Good explanation. Usually just replace pressure switches by the circuit board error code. They get hard & buggy with age, like me.

[@upengan78]

You sir are amazing . Your videos do have great depth of clarity . Thank you for this service and efforts to people 🙏✊👍 god bless.

[@ashwinpatel6588]

Jay Thank you very much for taking time and making great troubleshooting videos on almost all components of HVAC system. Great Job 👏

[@Stfncosminul]

hoooollly sheeesh , I didn't knew the thing about the voltage drop, that explains so much

[@ptyptypty3]

silicone vs silicon ...... Great video.. I'm watching all your furnace videos!!.. THANK YOU...

[@WordofAdviceTV]

Glad your liking the videos! Thank you for watching and commenting!

[@SilverMt.]

Thank you. always great to see someone who knows what they are talking about. fixed my Carrier wethermaster 8000. turned out to be the reset button just above the pressure switch the wire was connected to. we had some weird weather last night my water heater also stopped working, , just had to relight the pilot light. .

[@bentback1]

I forgot to add you are doing a great service and you should open your shop.

[@jhonatanoyarce4488]

wow, that was a lot of information to digest!, thank you for making this video

[@JohnnySpirit]

You rock. Im gonna be a great tech because of your videos when i get out of prison

[@hafidboston9674]

You are the best technician

[@brandonk.8511]

Very thorough with your explanations. Keep up the good work!

[@WordofAdviceTV]

Thank you!

[@jaimegonzalez6926]

Very well as always you are very good at what you do thanks for the the video and God bless

[@WordofAdviceTV]

Thanks Jaime!

[@blaineenriquez3135]

Nice tutorial,I just started classes and it helps me.thanks

[@BishopsPlace]

Great instructional video. Very knowledgeable instructor.👍🏽

[@nftcoin9899]

thanks mate, your videos are great, thanks heaps from Melbourne Australia cheers

[@claudiolopez2642]

Thank you! It helped me fix my furnace

[@ishwarballie3471]

Man I love your vedio I clean my sensor w I th a piece of sand paper and turn on boiler wallah ,I feel like a rocket scientist Thanks man. Ishwar Ballie .

[@bondedteam626]

You are such a great tech and an ecellent person. Thank you very much.

[@jcrazeful]

I have a big fat test today on this, and I want to thank you for this video 🤣😭😂😂

[@sarbbhamra6758]

Thank you, your videos are great. Very detailed.

[@vicdhillon7723]

Another great video with clear suggestions, etc. Thank you for getting me out of another jam with our furnace not working. Pressure switch was the issue. Keep up the great work!

[@Kaizengaragewerke]

Super helpful! Thanks for the excellent video!

[@homeboynguyen7849]

I learn so much from you .Thank you

[@ronmudry5686]

great video. clear and easy to understand. cheers

[@markgonzalez3474]

I think this is Jesus reborn...thank you sir for your easy to understand videos. I would love to work with someone like yourself to learn from on the daily

[@brinnonvallere]

nice vid. little tip to remember to check your meter first to see if it works properly...tough the leads together to see if continuity is registared

[@WordofAdviceTV]

Good pointer! Thank you!

[@jaylorenzana7761]

Thanks for all your videos. Small verbal glitch, ".3" is greater than ".17" - think you meant to say ".03".

[@raquelsapalaran2907]

wow great video tutorial... thanknyou for sharing your knowledge; very informative, you can make your own trainning center . keep safe always sir 🇸🇽

[@arturoa9571]

Thank you very much for the video As always you’re awesome!

[@WordofAdviceTV]

Thanks Arturo! Glad you liked it!

[@timothy5974]

Great video. I have an 80% carrier and it’s working properly. My igniter starts glowing approximately 15-20 after inducer starts. I checked the vac line and it’s clear to the inducer cavity. The pressure switch doesn’t seem to close as fast as yours. I count until the igniter glows. Otherwise it’s operating.

[@saeedhameed9148]

thanks for making very informative video vey well explained

[@jocelynbiro6216]

Thanks! I saved myself at least $180 on a service call. I had to say that I didn't know how to use an ohm meter so I borrowed one from my neighbor and he expained about continuity. I thought that ohm was a chant you did in yoga :)

[@keithbrown8372]

fabulous video. best on the net. thanks.

[@lancerudy9934]

Very nice. Keep up the great videos. Very helpful! Thanks

[@MattieK09]

Love your style my man

[@yepper1165]

Thanks! I was trying to find out if it was normally open or closed. You answered that!

[@manny09091]

those hands are super clean for a tech, good explanation of that pressure switch though.

[@ua7pyro591]

Lmao

[@victormartiny6419]

Thanks again Jay !

[@Will-fr9hg]

That’s the exact Trane furnace I have. How convenient

[@morrisdaft8]

Thanks for your time

[@mousetowndude]

Tip from experience... It's a good idea not to mess with the wire positioning and also not unplug those wires serving a pressure switch since it can cause the pressure switch internal contacts (micro switch) to change position ever so slightly. That can cause it to have an intermittent connecting and render a 3-flash code and shut the furnace down. I've had that happen a couple of times after brushing and cleaning the system while ending up causing more trouble that I started with. Disturbing the terminal stress on a pressure switch can lead to trouble so don't do it unless absolutely necessary, such as when getting the trouble code making it suspect. Leave sleeping dogs alone!

[@timothy5974]

I subscribe to that motto, leave sleeping dogs lie 👍

[@kalebkoehn7531]

Your videos definitely help me. I’m going into the Hvac world soon as a apprentice and I need as much knowledge as I can get

[@WordofAdviceTV]

Glad to hear that! Good luck in your career!

[@joemartinez7619]

I really respect your top tech knowledge how ever you may damage your electric tester by checking ohms when voltage is presented.

[@markh7631]

If you recall, in his video he disconnected the wires from the switch BEFORE checking with meter in ohms or continuity mode. Great advice though Joe!