furnace high limit switch keeps trippingBlog

furnace high limit switch keeps tripping

If neither of these solve your problem, the last thing id do is to turn off the furnace, turn the fan to on and feel the airflow out of a register that you can reach easily, then go to the furnace, remove the door on the blower and tape the door switch and turn it back on. It only takes a minute to sign up.My furnace is tripping the high limit. Experts weigh in. I'm stumped! (You may have to cut a small rectangular hole for patching later and use a flashlight and small mirror).If the "A" coil is plugged up with dirt (pet hair, dust etc) clean it out with a medium weight brush, and vacuum.It started when I adjusting vents Soon after the igniter fails, I found it in pieces. It sounds like you have a air restriction somewhere? This panel has no vents on it.With vents open I can't tell if fan is running at same speed as before.Only thing left to replace is the Blower Capacitor, perhaps the fan is too slow now for some reason.my furnace sits on it's side not Vertical and it's in my small attic space.I will assume you have an air conditioner home installation.There is usually a small access panel that can be removed where two lines enter the plenum.Have a look at the more common "A" coil inside the warm air plenum directly above the heat exchanger. coil may be plugged with dirt.Thanks for contributing an answer to Home Improvement Stack Exchange!

Have you changed the filter, and checked for inflow restrictions? Check for dirty filter, clogged/dirty blower wheel, closed dampers, blocked vents (supply and return), etc. It started when I adjusting vents Soon after the igniter fails, I found it in pieces. By using our site, you acknowledge that you have read and understand our Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Home Improvement Stack Exchange works best with JavaScript enabled I also changed the speed on the blower and checked gas pressure. Alot of time, people will put a dresser or couch in front of one and majorly block off airflow. Do you have the owners manual?Yeah -- if the A coil is clean and your furnace is still cycling on the high-limit, then I'd check for a blower failure or excess duct static. Featured on Meta The best answers are voted up and rise to the top 'AGT' shocker: 'These judges have lost their minds'Barbara Boxer takes a jab at Harris's time as prosecutorThinking about going to the dentist? I hope this helps you out.You adjusted the vents did you adjust the airflow. If its in the attic, you may need to have an ac tech come out and add a return. Are you sure it's the high limit?Yes like i said had blower door off. Anybody can ask a question site design / logo © 2020 Stack Exchange Inc; user contributions licensed under

I noticed that when I have the furnace burner side panel off, it runs fine. I'm stumped! Learn more about hiring developers or posting ads with us If you have an inducer motor, exhaust flow should trip the pressure sensor not the limit. However, in the unlikely event that the pressure switch has failed closed, that would be a problem.What is the model number of your furnace? Discuss the workings and policies of this site It is a Downflow Payne 90+ have replaced the limit switch. If you see a noticeable increase in air flow, you dont have enough return air for the furnace. It is a Downflow Payne 90+ have replaced the limit switch. I did look inside from evaporator side panel, looks clean. Any way I replaced the igniter and no flame, I found the high temp limit switch open so I reset it and it worked for a short while then it kept tripping so I replaced it and now it works for a longer time but...You need to start by opening all your supply air vents and see if the problem resolves itself.

Open all registers and dampers and take the filter out. By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Learn more about Stack Overflow the company I also changed the speed on the blower and checked gas pressure. Usually the ductwork is big enough that you can shut off a vent or two and not affect furnace operation, but if you have marginally sized ductwork and/or an oversized furnace, any restriction will cause it to go off on the high limit. Any way I replaced the igniter and no flame, I found the high temp limit switch open so I reset it and it worked for a short while then it kept tripping so I replaced it and now it works for a longer time but still trips. My furnace's high temp switch keeps tripping? My furnace is tripping the high limit. If it still is tripping off with all the supplies open, I would recommend checking all return airs and make sure there is nothing blocking them. It started when I adjusting vents Soon after the igniter fails, I found it in pieces. Start here for a quick overview of the site Get your answers by asking now. if exhaust vent was blocked would b press switch right99.9% of the time high limit trips are airflow problems. if its on a platform, you can cut out the wall and put a bigger return grill on it. If you checked the blower, filter and they are clean, Are you sure your blower motor is nott failing, With power turned off check the blower for free turning easily.Still have questions? Stack Exchange network consists of 177 Q&A communities including Does anyone have any ideas as to what's going on?The only way the plenum can get hot enough to hit the high limit is lack of air flow. Detailed answers to any questions you might have If it still gets too hot your central air "A" I pulled the blower door off and checked all vents to ensure they are open and it still short cycles. I pulled the blower door off and checked all vents to ensure they are open and it still short cycles.

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