It is not the limit switch in my case. I have a similar problem, furnace turn off around 10 minutes and turned out it was the flame sensor, clean the flame sensor fixed the issue.
Mine had the same symptom, started then after about 9 mins it stopped, then after about an hour repeated. But I just removed the condensation trap, rinsed then left some water in it, installed it back, the furnace works normally. One suggestion, if you hear the sound of water flowing when your furnace stops, wash the condensation trap. If your furnace cuts off less than a minute after starting, check your flame sensor then check your pressure switch. Several years ago, I had this problem and changed my pressure switch by myself. This time, the error code indicated a pressure switch error again, but I didn't think it would be the cause.
My furnance kicks off about 10 mins after it runs then the fan will run for about 2 mins and the furnace will kick back on and finish heating and then will be fine till it heats again. I have had 2 different companies here.
Have you checked the limit switch , flame sensor, and the thermostat. Make sure your filter is clean. Please subscribe like and share and check out our other helpful videos.
My furnace has the same problem, so I put a hot plate under the receiver that is the ceiling and it gets warm to pull the air through. The air gets very in air duct and doesn't turn off. It blows the warm air around. As soon though as turn the burner on after about 5 minutes it shuts off. It takes a bit to come back on. The duct stays hot but doesn't shut down with hot but does with burner on. Any ideas?
My furnace won’t stay on. I have to reset it and will only be on until it reaches the set temp. Then won’t turn on again until I reset it again. Any tips?
Hey question my furnace is runing like normal and then it shuts off the flame and turns off my ecobee 3 thermometer then the boards indicator light blinks 4 xs saying its an open limit switch or limit switch and after 10 mins restarts the flame and thermometer I cleaned the flame sensor, the igniters working properly none of the other 4 sensors are tripped the small fan runs but im not sure if my capacitor or big blower is running. what could cause the hardwired ecobee 3 thermostat to keep shutting off? I replaced the 7inch long limit switch and its a goodman furnace s lil older but ran fine for 13yrs that ive lived here also clean airfilter and the one before that was clean and not that thick. also had my ducts and lines and furnace cleaned out by a company a year ago. Thanks in advance.
Nothing to do with the switch. The switch is either good or bad. The pressure or the limit switch or any switch switch is the most unnecessary repair as well as trhe most miss diagnosed. 95% of the times the switch was fine. Simply test it for continuity and voltage and you will know. The problem may be the inducer fan ( the small fan) which can be dirty, weak, intermittent, weak wire connection, or likely have a bad seal between the fan and the wall of the furnace.
This guy is giving everyone incredibly wrong and potentially life threatening information. Being a college instructor in basic to advanced heating air conditioning and refrigeration systems, I know just a few things about these systems. The most common cause of a furnace cutting out on the high limit switch is insufficient airflow, such as crushed flexible ducts or restrictive ducts. The purpose of the high limit switch is to protect the appliance from overheating. Replacing the high limit switch will not solve your problem. Limit switches rarely fail and if the do, it's in the safe position. Call a professional and and it could save your life.
If you change out your limit switch and there is something still wrong, the new limit switch will do its job and cut the furnace off, and then you will know there is something else wrong, then you can call the professionals and hope you get a fair one that won't over charge or flat out scam you.
The thickness of the filter could cause the limit switch to malfunction, too. Most furnaces cant function thoroughly with thick air filters.
Good tip thanks. Please subscribe like and share 🙏.
It is not the limit switch in my case. I have a similar problem, furnace turn off around 10 minutes and turned out it was the flame sensor, clean the flame sensor fixed the issue.
Mine had the same symptom, started then after about 9 mins it stopped, then after about an hour repeated. But I just removed the condensation trap, rinsed then left some water in it, installed it back, the furnace works normally. One suggestion, if you hear the sound of water flowing when your furnace stops, wash the condensation trap. If your furnace cuts off less than a minute after starting, check your flame sensor then check your pressure switch. Several years ago, I had this problem and changed my pressure switch by myself. This time, the error code indicated a pressure switch error again, but I didn't think it would be the cause.
Thank you for this!!
You're very welcome! Glad I could help. Please subscribe like and share and check out our other helpfull videos
Very informative thank you
Your welcome glad could help please subscribe like and share and check out our other helpfull videos.
My furnance kicks off about 10 mins after it runs then the fan will run for about 2 mins and the furnace will kick back on and finish heating and then will be fine till it heats again. I have had 2 different companies here.
Have you checked the limit switch , flame sensor, and the thermostat. Make sure your filter is clean. Please subscribe like and share and check out our other helpful videos.
My furnace has the same problem, so I put a hot plate under the receiver that is the ceiling and it gets warm to pull the air through. The air gets very in air duct and doesn't turn off. It blows the warm air around. As soon though as turn the burner on after about 5 minutes it shuts off. It takes a bit to come back on. The duct stays hot but doesn't shut down with hot but does with burner on. Any ideas?
Check and clen flame sensor if not your limit switch maybe going out.
My furnace won’t stay on. I have to reset it and will only be on until it reaches the set temp. Then won’t turn on again until I reset it again. Any tips?
Chech thermostat could be faulty and can cause your problem. Please subscribe like and share 🙏.
This exact thing is happening right now with my lennox. Should i check the flame sensor first or no?
Yes clean flame sensor first, this can cause problem also.
How to fix this issue? How I should send to the video?
Replace switch. Glad could help Please subscribe like and share 🙏.
Hey question my furnace is runing like normal and then it shuts off the flame and turns off my ecobee 3 thermometer then the boards indicator light blinks 4 xs saying its an open limit switch or limit switch and after 10 mins restarts the flame and thermometer I cleaned the flame sensor, the igniters working properly none of the other 4 sensors are tripped the small fan runs but im not sure if my capacitor or big blower is running. what could cause the hardwired ecobee 3 thermostat to keep shutting off? I replaced the 7inch long limit switch and its a goodman furnace s lil older but ran fine for 13yrs that ive lived here also clean airfilter and the one before that was clean and not that thick. also had my ducts and lines and furnace cleaned out by a company a year ago. Thanks in advance.
Flame sensor could still be bad I would try that first. Please subscribe like and share.
Would this happen to a new furnace???
Yes could happen. Please subscribe like and share 🙏.
Isn't this a sequencer?
My limit switch have 3 wire. I can not see the numbers. Do you have anyidea what number switch I can get
Sorry but not sure, but look for the specs on your furnace.Please subscribe & like and share if haven't already and check out our other helpful videos
awsome thks
Your welcome glad could help please subscribe like and share and check our my other helpfull videos.
Aren’t you suppose to tell us where on the furnace you found this piece?
Nothing to do with the switch. The switch is either good or bad. The pressure or the limit switch or any switch switch is the most unnecessary repair as well as trhe most miss diagnosed. 95% of the times the switch was fine. Simply test it for continuity and voltage and you will know. The problem may be the inducer fan ( the small fan) which can be dirty, weak, intermittent, weak wire connection, or likely have a bad seal between the fan and the wall of the furnace.
Possible easier fix. Change out your dirty air filters. Just did 😁
Please subscribe like and share and check out our other helpful videos.
Or maybe is not venting!
This guy is giving everyone incredibly wrong and potentially life threatening information. Being a college instructor in basic to advanced heating air conditioning and refrigeration systems, I know just a few things about these systems. The most common cause of a furnace cutting out on the high limit switch is insufficient airflow, such as crushed flexible ducts or restrictive ducts. The purpose of the high limit switch is to protect the appliance from overheating. Replacing the high limit switch will not solve your problem. Limit switches rarely fail and if the do, it's in the safe position. Call a professional and and it could save your life.
If you change out your limit switch and there is something still wrong, the new limit switch will do its job and cut the furnace off, and then you will know there is something else wrong, then you can call the professionals and hope you get a fair one that won't over charge or flat out scam you.