Thanks for this video, this issue was the exact problem with my furnace. The issue was resolved. I also like the description of the switch numbers (i.e. the temperature range). The video quality was excellent and showed the problem.
Thank you SO MUCH! I had a brand new system installed and it kept giving code 33. I watched several videos and tried many things to improve airflow with mixed results. I put the tape on exactly as you showed and THAT solved my problem. I've been running for a few weeks, even with really cold temperatures outside with no more code 33 resets!
You are a god among men. My furnace was acting up all last winter until it finally stopped heating all together, just constantly showing code 33. Did your trick and I am back to working for $0. Thank you!!!!!!
Would this cut the power to nest thermostat which shows error E74: no power to the rh wire? I'm getting this error on nest and checked the window to see LED showing error 33. I also noticed the air coming out of the vents when it does work isn't as strong as it used to be.
@@mohammadsiddiqi6573 yes absolutely. Furnace drops power to thermostat when furnace overheats (error code 33). Circulator fan will run non-stop to cool off furnace. Fan only shuts off during trial for ignition.
Just added the tape, but still getting a 33 code around 9 mins into heating. Though it seems to not be short cycling, at least from the initial tests. Assuming best to try replacing the limit switch all together?
@@PocketFullaPesos those are very rarely bad. Replacing it wouldn’t fix anything as the underlying problem would still exist. Have you verified manifold gas pressure is correct using a manometer and checked airflow?
@@fatkat311 a clogged heat exchanger possibly could cause the high limit to trip. If it is a clogged HX it is obvious because there will be a very foul smell coming from the furnace exhaust when it is heating. If that’s the case, the furnace needs to be shut down and repaired before operating again.
@@victork3397 i have an 80k btu bryant manufactured 2010 with constant rollout trips. I disassembled the htx and found the secondary is rusted and 90% clogged. I’m getting enough draft through the heat exchanger that my pressure switches are still making, but not enough for the flame to make it into tubes all the way. Bryant recognized This is a manufacture defect on the heat exchanger and since changed the part number and extended the warranty. I was able to go up to my local Hvac Shop and pick up all the parts at zero cost. I’m actually on my way up there right now.
@ I’m surprised the hvac shop is giving the parts to you. I’ve never heard of that happening before. Usually they won’t give you the parts unless you pay to have their technicians install it.
Are there any risks/downsides to attempting this solution before checking gas pressure? I’ve replaced the furnace filter so the problem does not seem to be with air flow. I already have HVAC tape on hand but don’t have a manometer. Is it okay to tape the insulation as you described, as my next step? If error cord 33 continues afterward I will get a manometer to test thtggas pressure.
@@tobiasraether824 a clean filler is not the only thing that affects airflow. Make sure all supply registers are open and the return registers are free and clear (no blockages). If you have those small filters people like to stick in the supply registers, remove those. If you’re able to get eyes on the physical ducting and trunk lines, make sure nothing is crushed/damaged. If you have an air filter at the furnace (whole house filter) you should not have any other filters installed. Do not double stack filters. Testing gas pressure is more intricate and is done at your own risk. I would not advise this unless you know what you are doing. If the furnace ran fine in the past, then it most likely isn’t a gas pressure problem as the manifold gas pressure can only be changed manually. However if you had a recent service, or a gas valve changeout, then I would question the manifold gas pressure. If you do not have a manometer, then another way to check gas pressure is by checking consumption via clocking the gas meter (many videos on TH-cam about this) and comparing with the furnace data plate. Taping the insulation is quick and easy, a worthwhile test in my opinion.
My parents 80k btu Carrier furnace has been tripping on Error Code 33 Since it was installed 8 years ago. Technicians couldn't see anything wrong and said it must be an airflow issue so they wanted to put in more returns. They had no issues with the 100k btu furnace they had before this one (old house - they added more insulation in attic), So we didn't think it was an airflow issue. They added more returns and that didn't fix it. Next they said we didn't have enough supply vents so they stabbed a 4 inch hole into the duct just below the evaporator coil. That didn't fix it So they wanted to clean the Evaporator Coil, That wasn't the issue and They were never able to solve it so they just left it tripping Error 33. A couple weeks ago their thermostat started acting up, only calling for heat for just long enough to start the blower then it would trip an Error 12. Replaced the thermostat with a new one and Got it back to it tripping error 33 2 days ago your video showed up in my feed, I looked into the hole they cut and sure enough the insulation around the limit switch was coming off and blocking the air flow. Taped the insulation back down and went in with a long stick to push it back down as it was peeling from the bottom as well For 2 day now that furnace has been running without a single Error 33 - House is much more even temperature and the furnace doesn't run as long Thank you so much for sharing this with everybody, Without you I would never have guessed that could be an issue
Thanks for this video, this issue was the exact problem with my furnace. The issue was resolved. I also like the description of the switch numbers (i.e. the temperature range). The video quality was excellent and showed the problem.
Thank you SO MUCH! I had a brand new system installed and it kept giving code 33. I watched several videos and tried many things to improve airflow with mixed results. I put the tape on exactly as you showed and THAT solved my problem. I've been running for a few weeks, even with really cold temperatures outside with no more code 33 resets!
@@E.P-d9d that’s awesome! Glad to hear you were able to fix it!
You are a god among men. My furnace was acting up all last winter until it finally stopped heating all together, just constantly showing code 33. Did your trick and I am back to working for $0. Thank you!!!!!!
@@dudebro21 just your average technician here. Glad you found the video useful.
You sir are very smart! Resolved an issue that 2 other tech's couldn't. 😌 Saved me $1,800.
Good job.
@@maheradous9257 Thank you! Glad you found the video useful!
Would this cut the power to nest thermostat which shows error E74: no power to the rh wire?
I'm getting this error on nest and checked the window to see LED showing error 33. I also noticed the air coming out of the vents when it does work isn't as strong as it used to be.
@@mohammadsiddiqi6573 yes absolutely. Furnace drops power to thermostat when furnace overheats (error code 33). Circulator fan will run non-stop to cool off furnace. Fan only shuts off during trial for ignition.
Good stuff Brother!
never thought of that! nice video
Great video. Can you recommend a foil tape?
@@NeilPopovich HVAC foil tape will work. Available online and at big box stores
Just added the tape, but still getting a 33 code around 9 mins into heating. Though it seems to not be short cycling, at least from the initial tests. Assuming best to try replacing the limit switch all together?
@@PocketFullaPesos those are very rarely bad. Replacing it wouldn’t fix anything as the underlying problem would still exist. Have you verified manifold gas pressure is correct using a manometer and checked airflow?
I have a clogged secondary htx… hi eff bryants seem to have this issue quite a bit. Just something to keep in mind. Hopefully that isnt your issue
@@fatkat311 a clogged heat exchanger possibly could cause the high limit to trip. If it is a clogged HX it is obvious because there will be a very foul smell coming from the furnace exhaust when it is heating. If that’s the case, the furnace needs to be shut down and repaired before operating again.
@@victork3397 i have an 80k btu bryant manufactured 2010 with constant rollout trips. I disassembled the htx and found the secondary is rusted and 90% clogged. I’m getting enough draft through the heat exchanger that my pressure switches are still making, but not enough for the flame to make it into tubes all the way. Bryant recognized This is a manufacture defect on the heat exchanger and since changed the part number and extended the warranty. I was able to go up to my local Hvac Shop and pick up all the parts at zero cost. I’m actually on my way up there right now.
@ I’m surprised the hvac shop is giving the parts to you. I’ve never heard of that happening before. Usually they won’t give you the parts unless you pay to have their technicians install it.
Are there any risks/downsides to attempting this solution before checking gas pressure?
I’ve replaced the furnace filter so the problem does not seem to be with air flow. I already have HVAC tape on hand but don’t have a manometer. Is it okay to tape the insulation as you described, as my next step? If error cord 33 continues afterward I will get a manometer to test thtggas pressure.
@@tobiasraether824 a clean filler is not the only thing that affects airflow. Make sure all supply registers are open and the return registers are free and clear (no blockages). If you have those small filters people like to stick in the supply registers, remove those. If you’re able to get eyes on the physical ducting and trunk lines, make sure nothing is crushed/damaged. If you have an air filter at the furnace (whole house filter) you should not have any other filters installed. Do not double stack filters.
Testing gas pressure is more intricate and is done at your own risk. I would not advise this unless you know what you are doing. If the furnace ran fine in the past, then it most likely isn’t a gas pressure problem as the manifold gas pressure can only be changed manually. However if you had a recent service, or a gas valve changeout, then I would question the manifold gas pressure. If you do not have a manometer, then another way to check gas pressure is by checking consumption via clocking the gas meter (many videos on TH-cam about this) and comparing with the furnace data plate.
Taping the insulation is quick and easy, a worthwhile test in my opinion.
My parents 80k btu Carrier furnace has been tripping on Error Code 33 Since it was installed 8 years ago.
Technicians couldn't see anything wrong and said it must be an airflow issue so they wanted to put in more returns.
They had no issues with the 100k btu furnace they had before this one (old house - they added more insulation in attic), So we didn't think it was an airflow issue.
They added more returns and that didn't fix it. Next they said we didn't have enough supply vents so they stabbed a 4 inch hole into the duct just below the evaporator coil. That didn't fix it So they wanted to clean the Evaporator Coil, That wasn't the issue and They were never able to solve it so they just left it tripping Error 33.
A couple weeks ago their thermostat started acting up, only calling for heat for just long enough to start the blower then it would trip an Error 12.
Replaced the thermostat with a new one and Got it back to it tripping error 33
2 days ago your video showed up in my feed, I looked into the hole they cut and sure enough the insulation around the limit switch was coming off and blocking the air flow.
Taped the insulation back down and went in with a long stick to push it back down as it was peeling from the bottom as well
For 2 day now that furnace has been running without a single Error 33 - House is much more even temperature and the furnace doesn't run as long
Thank you so much for sharing this with everybody, Without you I would never have guessed that could be an issue
@@Cow_95 I’m glad you found the video useful! Definitely something more technicians should be aware of.