Troubleshooting the Pressure Switch in a Gas Furnace!
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- čas přidán 22. 10. 2018
- In This HVACR Training Video, We Diagnose a Gas Furnace Pressure Switch by Reading the Voltage Across the Switch and the Negative Water Column Pressure to see if the Pressure Switch is Open or Closed and Why the Error Code Exists. We use a Digital Multimeter and a Digital Dual Water Column Manometer for Troubleshooting. Supervision is needed by a licensed HVACR Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In The Video
UEI Digital Dual Manometer- amzn.to/2CWC6BD
Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-amzn.to/2jyK5Ka
3/16" x 3/16" x 3/16" brass barbed tee- amzn.to/2INSRhQ
UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ
2 pairs of alligator clips- amzn.to/2CtIL5z
Supco Universal Adjustable Pressure Switch -.01wc -10.0wc amzn.to/2G1y0py
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Our Related Videos/Articles
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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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For those that are looking for the tools used in the videos: (Linked Below)
UEI Digital Dual Manometer- amzn.to/2CWC6BD
Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-amzn.to/2jyK5Ka
UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ
3/16" x 3/16" x 3/16" brass barbed tee- amzn.to/2INSRhQ
1/8" NPTF x 3/16" barb fitting for reading wc pressure- amzn.to/2G563Bq
Supco Universal Adjustable Pressure Switch -.01wc -10.0wc amzn.to/2G1y0py
Supco Magnet Jumpers amzn.to/2gS4h6z
2 pairs of alligator clips- amzn.to/2CtIL5z
Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos amzn.to/2aenwTq
Here is a link to Refrigerant hoses with valves used in the videos amzn.to/2aBumVI
Here is a link for RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn
Here is the link to the Appion Valve Core Removal Tool- amzn.to/2uYr8WL
Here is the link for the Ratcheting Service Wrench amzn.to/2dGV4Nh
Here is the link to the CPS Vacuum Micron Gauge- amzn.to/2v1nM3O
Here is the Link to the Appion Blue 3/8" to 1/4" Vacuum Hose- amzn.to/2uYlVyc
Here is the Link to the Appion Red 3/8" to 1/4" Vacuum Hose- amzn.to/2uYg6Ro
Here is the link to the Yellow Jacket 1/4" by 1/4" heavy duty hose straight- amzn.to/2umtcod
Here is the link to the pack of 25 C&D valve cores- amzn.to/2J1lurm
Here is the link for the C&D Valve Core Wrench, Container, and 3 valve cores- amzn.to/2EVGkps
Other tool links can be found in the video description section.
Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech
All of the ACSERVICETECH Playlists- czcams.com/channels/OZR-1IqsAer9wzlvFgb4mA.htmlplaylists?view_as=public
For new technicians this is the gentleman that you have to pay attention it will teach you all kinds of stuff and believe me you got to have a little patient and down the road you going to be just fine he's got a lot of knowledge to share with you guys.
Craig well done as allways.
Thanks a lot Nurfet Alic!
not only for the new techs , this channel is the best HVAC channel there is imo...ve been in the trade for more than a decade and i'm still learnin new things watching his vids
You are the best on CZcams sir. You have the gift to teach. Thank you for all these videos , they are a huge help.
Thanks Drifter436!
Just getting started in the industry with 2 levels of school, this channel is great Thank you.
Thanks a lot Dennis!
You are a great teacher. I will use this setup for troubleshooting. Thank you for the video.
Thanks Ron!
Thank you very much. I'm a new technician I need all the help I can get your videos or not just informative but their inspirational as well.
Well thank you very much Chris! I really appreciate your note!
Thank you very much for another great video 👍👍👍👍🇺🇸
Thanks Gilberto Patino!
Thanks again perfect time it started to get cold
Thanks ejohnfall!
You can tell an instructor from a CZcams service Technician. A technician will usually slip in something bad about Goodman, because Goodman doesn’t pay companies incentives like some other brands. An instructor will teach you that if you install a system correctly, they are all good
Arrived at service call.
Wiped top cabinet with a rag.
Conclusion: its goodman
Thnx for your video, i love your Chanel.
Thanks GH Leader!
Well done!
Thanks Watcherjohnny!
enjoyable to watch ...
Thanks Pei Broker!
Thank you for your great content & sharing your expertise with us. But 1 question I have that I've wondered is, say the furnace goes through its sequence and starts heating. What if the pressure switch opens back up after it's already started heating, will the system shut back down or will it wait until next start up cycle. Thank you so much again.
Awesome...
Thanks N Eliseo S Carranza!
I've found the water column rating for the pressure switchs on the actual schematic in small writing in some cases.
Just replaced a pressure that was BAD. The replacement just gave me problems after a week of working. Thoughts?
Im wondering why on a new install why sometimes priming the drain trap is needed so the pressure switch makes but then the same issue is present when the trap is clogged..🤔
Great video. I've been doing HVAC for a 30 years 33 to be exact and have never had a really good procedure on very tough pressure switch problems. I work for a school district now and don't have to deal with it as much but we still have some furnaces there. How did you figure out it was the induction tube by your pressures that you were reading? Cuz they both right about the same. What I've done in the past is I've just disconnected both the supply in the exhaust and see if it would come on to see if it is the exhaust or intake piping. Real good video and I know it's going to help me in the future but how did you figure that one out by just looking at those pressures that it was the intake?
You are right, I just opened up the combustion air inlet and the pressure changed. Also, when the inducer is high enough to allow the pressure switch to close and the intake is just as high then you know the problem is on the intake or heat exchanger side, thanks
@@acservicetechchannel how would you know if you had a problem with the heat exchanger looking at those readings?
If you can’t suck right , there’s not much air to push ! Like if you put a box fan against a wall , you won’t get much air flow on the outlet !
Can you wire a pressure switch backwards?
Hey my friend. I’m still going to purchase a dual manometer but without it the furnace does everything. Cfm on, pressure switch closed, HSI lit, burners on with a flame sensor, then off 4-7 seconds.
Sounds like flame rectification, board or pressure switch but you would need to test each function individually, thanks
Could you do a video about correctly hooking up manometer hoses in line with pressure switches? I always get mixed up.
look up "acservicetech pressure switch" and "gas furnace component history"
👍
Thanks Clint!
Great video but now I'm dying to know what was the blockage!
This was a birds nest scenario, thanks Rob!
ha, pulled a squirrel carcass from one today with my k 50 cables.
Ha ha wow!
Sweet. Look forward to your videos! I get to be the first comment 😋😀
Thanks Daniel!
hi, so on the + side of the pressure switch the vacuum is created through the heat exchanger? is this correct? thanks.
yes correct, thanks
Hello! I noticed that you had the positive port of the manometer hooked to the - Side of the switch (more of a vacuum ) . And the negative port of the manometer hooked to the + side of the switch that connects to the burner box which is atmospheric. For ur differential. Is that a mistake ? Or does it not matter ??? I’m a new technician out of school and I am constantly running into pressure switch issues and I am trying to really grasp what readings I’m looking at and what readings I should have 100%. So I am not just guessing
One small questions . I get the pressure switch hose that runs directly to the inducer . But right here I see it hooks up to the gas valve then goes to the burners to just have a hoe inside the cage burners . ? Why ?! Can you please explain throughly . Thank u
That is so that the atmospheric pressure at the burners remain the same as at the gas valve so there is no problems with the flame or at the pressure switch!
Can this furnace be used for a down flow application ?
Yes it is can be installed horizontal right, horizontal left, upflow or downflow, thanks
AC Service Tech LLC thank you very much Craig
Glad to help Thomas!