Gas Furnace Troubleshooting! Pressure Switch Testing & Condensate Problem Error Codes!
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- Опубликовано: 2 окт 2024
- In this HVAC Video, I cover the Furnace Troubleshooting in the Sequence of Operation prior to the Furnace Lighting. This covers the inducer motor, pressure switch, and condensate problems. I go over the electrical and pressure testing needed to correctly diagnose the problem. If you have an error code such as #31 that says the pressure switch did not open or reclose then this video is for you. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In The Video
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Alligator Jumpers- amzn.to/2PxqJXn
hilmor Screwdriver- amzn.to/3NbXW6r
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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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I watched another video where the tech showed to test the "primary auto limit switch" he simply unplugged the two wires from it and tested from one terminal on the switch to the other for continuity..it had no continuity so he said to replace it..also to make sure this part is faulty he jumped the two wires going to the limit switch together and the furnace was now able to ignite the burners. Do you think is a good way to test this part? My primary auto limit switch tests this way exactly so I'm about to order one..just double checking before I do.
Also, why do the other two limit switches up by the burners have reset buttons on them and the primary auto limit switch does not? my furnace is an Amana GULA090AX50
well done training video, you really explaining everything thoroughly but directly and to the point with obvious expertise. Thanks for this kind of excellence.
Thanks majest33!
another A1 video, straight to the point!
Thank you very much Refrigeration Tech!
acservicetech lol
So clear. Thank you so much
Great to hear, thanks!
Can you wire a pressure switch backwards?
Nice video, thank you very much for this great information, keep posting great video.
Thanks Ivan!
Who thumbing down these free HVAC training videos? Unappreciative people, Craig is a God send to the industry!!!!
I am glad you appreciate the videos, thanks Tank!
Check out the fieldpiece dual port manometer with the draft simulator for testing pressure switches. You will never say "maybe" when troubleshooting a pressure switch again.
I believe it's the SMD1
Yes the SDMN6 is a very nice tool for checking isolated pressure switches with it's internal pump. Thanks!
I have detached all ground wires and the Lennoxs’ still fire. Also, replaced a a Lennox IFC board with a general replacement board that had a specific spade for Lennox for flame current via the flame rod wire. Does Lennox flame verify by dc current back from the flame rod wire or otherwise?
Usually there is a ground wire on the board that connects to the frame of the furnace. This can also be connected to the common. Sometimes you will see this wire will make its way to the gas valve as common and ground. The dc microamps goes back to the board through this ground wire, thanks
Can you make a sequence of operation video of a typical 80% gas hot water boiler with spark ignition, fan center, fan in the can, automatic flue damper and probe type low water cut off?
If I run across one with a homeowner that I am comfortable with then I can do one. I can only do videos on what I have at the shop or on a service call when I have time unfortunately. Thanks!
If there is a bird's nest in the vent pipe, how do you recommend removing it?
I would remove the inducer, run a fish through the exhaust to the top, add a rag to the top on the fish and pull it through to the inside, thanks
So today I had a Trane XE90 where the hose to the collector box was at -1.9” and the hose to the gas valve and burner box was -0.15” w.c. When I had both hoses hooked up to my manometer, it was giving a differential of -1.75”. The switch that was on it was rated for 1.4” which I’m guessing was meaning -1.4” but it wasn’t closing unless I unhooked the hose to the burner box and gas valve. My questions are 1) what is that hose actually measuring and 2) is it supposed to be positive or negative? It connects to the positive port on the valve but it seems to me it should be reading negative from the inducer pulling through the HX.
It is reading negative even though the pressure switch says positive. It just means it is differential like you are saying. Did you check the pressure switch isolated from the furnace such as with a SDMN6 to see if the switch actually closes at 1.4? You would just run the vacuum with the pump on the negative side until the switch closes to see at what -pressure it closes at. It sounds like the pressure switch is not closing at the right pressure from your readings. By the way, how do the flames look and did you check for proper combustion?
Another great educational video. You're the man!😎
Glad you enjoyed it!
This past week on Long Island we had serious 90 percent furnace issues. Condensate lines and trap frozen . Also , icicles built up on exhaust and fresh air intake . Quick tip before condemning the pressure switch , take inducer clamps off and remove from pvc fitting while servicing . 8-10 Times I’ve found that it wasn’t a pressure switch but an air exhaust issue . Obviously for troubleshooting only for anyone new . Great video once again !
Check this video out on testing pressure switches isolated from the furnace- ruclips.net/video/QAEBLigVD5g/видео.html
In the 80s i was one of the first to install high eff gas boiler. Immediately had problems with pressure switch due to unventted dryer. We resolved that then had problems with gas supply in my neighborhood. My low pressure pipes in the street werent maintaining a steady pressure. It would drop by just 1 or 2 inchs water column and heater wouldnt handle that. Luckily tied into hp main on str and never had problems again. Down the road the utility put in new reg pits to correct pres problem.
Nice, thanks Skip!
thanks for the video very helpful
Thanks Phil!
can you please explain why there are 2 pressure switches for a 2 stage gas valve? but the inducer has only one speed. does the low fire pressure switch for 1st stage goes OFF when high second stage is ON? only one pressure is closed each time for each stage correct? thank you.
sometimes there is a differential depending on how the tubing is going. Sometimes the two pressure switches are connect through the back. Have you seen this playlist on pressure switches yet?- ruclips.net/video/XKAyznghlro/видео.html
Thank you very much for the great video.
Glad to help Alex!
Hi, I am a recent subscriber. I am enjoying your channel. Do you have a video demonstrating how to change a gas valve? If not, could you make one? I would love to see how you do change one. Thanks again!
Here is one that you may like. It is a propane conversion and the gas vlave comes out and pressure is set.- ruclips.net/video/ZqSBe6-xDSU/видео.html
Thank you
Bad secondary? Was that a plus 90? Looked like too much IN. WC ....
You would have a high in wc on the inducer side but a low in wc on the combustion side if the secondary was partially clogged. It usually doesn't clog completely, thanks
Thank you for another excellent video.
You are welcome, thanks Gilberto!
What if I only have 24V on one side of the pressure switch? Is the switch then bad?
It could be many other things. the condensate trap backed up, exhaust partially clogged, intake partially clogged, clogged heat exchanger, bad inducer motor, bad inducer wheel, bad inducer motor capacitor, clogged pressure switch tubing or clogged tubing port where it connects to the inducer at, thanks
Can you plz do a video on how to clean the screen vent intake on a 90% furnace
Thanks for letting me know what you would like to see!
Love your videos thanks you for your time
Thanks fernando Ebenezer!
Exactly where in a micro wave would I find those magnets ?
It is part of the magnetron, thanks
This video is awesome! You just saved me $500 bucks!
Thanks Neil!
One of the best videos I’ve seen on this subject. Well done!
Thanks John!
How would you the trap is back up clogged
Lance check this video out, thanks- ruclips.net/video/guf3TESb3V0/видео.html
amazing video is there a way to tell by amperage on the inducer motor if the lines in the exhaust is clogged reguarding the load of the amperage of the fan
Unfortunately we don't know the target amperage. On a psc, the motor would draw less with a clog. A variable motor would draw more amperage with a clog. You would use a combustion analyzer to determine if the gas is burning correctly if part is clogged off. When it is bad, you can see it in the combustion chamber. It's crazy that some 90% efficient secondary chambers were built with just a slight rubberized coating on the galvanized tin and they didn't think it would rust shut, thanks
Thats interesting you say that and i didnt know that but i thought if there was a clog it would draw more amperage due to the fact its struggling to push out due to a higher load
When air is restricted on a psc motor, the motor will spin faster, the velocity of the motor wheel will be faster and amperage reduced. This is because the fan wheel is not getting loaded up with air molecules. A variable speed however would try to push harder and it will cost more wattage, thanks
Nice video ,thanks
Thanks a lot Lance!
What size of tee is needed for this connection?
Hey Attisso, a 3/16 barbed tee is used to keep the hoses connected while taking a reading with the manometer. Some of the higher end manometers will come with the tee. Otherwise, it will have to be ordered or pulled from an old furnace from a changeout, thanks!
Nice video, thank you very much
Thanks Carlos!
Noice!
Thanks Noe Farfan!
Another great video
Thank you Saeed! I appreciate it!
Excellent.
I appreciate it!
Good video
Thanks Alex Rivas!
Thanks.
Thanks Attisso!
Wrong , there is no 90 to 100 volts to flame rod , try again , it sees microamps across it from flame rectification , the board looks for a minimum to prove flame ! Your not a certified tech are you !!
Michael, I am sorry but the board has to send a hot leg of ac voltage to the flame rod in order for this ac voltage to be rectified by the flame. Next time you are working on a furnace check for an ac voltage reading between the rod and the 120v common or ground. You will not have the dc microamp signal without this ac voltage.