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Problem: I purchased a flame sensor from you for my Goodman furnace. The new flame sensor did not fix the problem.

Problem: I purchased a flame sensor from you for my Goodman furnace. The new flame sensor did not fix the problem. My furnace still lights for 7 to 10 seconds and then the gas goes out. What could be the problem?

Answer: Since your furnace is still having what sounds like flame sensing problems I would suggest making sure the flame sensor is positioned in the flame where it is getting a good hot blue flame to sense. I would suggest checking all connections to make sure they are tight (especially the ground connection on the transformer). Check your plug-in connection that goes between the blower section and burner section of your furnace. Check wire and flame sensor connections to make sure they are tight. I would recommend checking all rollout switches, limit switch and pressure switch to make sure they are closed (current flowing through) them all the time. This could be a control board problem, not sensing the flame. I you have any other questions please email us anytime. Our email address is: or leave a comment in the comment section below. Below we have a great YouTube video that was made by grayfurnaceman. This video shows how to test a flame sensor with a cheap meter. Thanks grayfurnaceman for making this informative video! We also have a video made by Acservicetech that shows how to troubleshoot and replace a flame sensor. Thanks to Acservicetech for making this informative video! We sell flame sensor for many different furnace models on the following page: Please click here if you would like to see the furnace flame sensors we sell. We sell the flame sensor for the Goodman furnace on the following page: Please click here if you would like to see the Goodman Flame Sensors we sell.  Please send us your furnace’s model number if you would like for us to look up and see which flame sensor your furnace uses.  Our email address is: We would love to help you out and have your business! Steve Arnold

14 thoughts on “Problem: I purchased a flame sensor from you for my Goodman furnace. The new flame sensor did not fix the problem.

  1. New motherboard,flame sensor,igniter,filter,cleaned registers and pipes. Burners will work from 1 second to 12 hours. And where should the loose copper wire coming in from the fuse box go it’s not connected to anything

    1. Hi! The loose bare copper wire should be connected to the body of the furnace or to the power switch box body. This is the safety ground for the furnace so that if any high voltage power is transmitted through the body of the furnace it will kick the circuit breaker off so no one will get shocked. This ground wire not being connected could be your problem. Since sometimes your furnace works for 12 hours without any problems it sounds like you might have another problem that is not related to the flame sensor. I would like to suggest that you test the pressure switch and limit switch with a voltmeter to make sure they are staying closed the next time your furnace has problems. Also, make sure all wire connections are good and tight. If you have any Molex connectors which are plastic plugin connectors with many wires connected together then I would suggest that you unplug any Molex connectors, check to make sure all the connections (plugins) are not arcing (see burnt spots) then plug the connector back in good and tight. I have seen several of these plastic connections arc and not connect properly and this could be your problem. I hope you can fix this problem soon! Steve

  2. I have a York stellar plus , that will ignite for 2 to 3 seconds then go back out. I cleaned the flame sensor and it still goes out after 2 to 3 sec .
    I haven’t checked gas pressure yet. But I’m leaning toward a bad ignitor board.
    What’s odd is my other weatherking furnace is doing the exact same thing which makes me wonder if it’s a gas pressure problem.

    1. Hi Toney! Sometimes cleaning flame sensors does not always work. You might need a new flame sensor. If you send me your furnace’s model number I will be glad to look it up and see which flame sensor your furnace uses. Please send the model number to our email address if you want me to look up parts: Yes, this could be a gas pressure problem. I would like to suggest that you watch the furnace burners and flame when the furnace does light for those short 3 seconds. If the flame sensor is not engulfed in the blue flame then you might have a gas pressure problem or you might have dirty burners. I would like to suggest that if the furnace has not been cleaned then you turn off the gas and the electricity to the furnace, remove the burners and blow them out with compressed air. I would like to suggest that you check all wire connections, especially any ground wires to make sure they are good and tight. The flame sensor senses microamps so any loose connection can cause a problem. I hope you can easily find and fix the problem. Steve

      1. I just replaced the igniter and sensor which is 1 piece in mine. It lights and sometimes stays lit for 2 mins, sometimes under 1 min. I have to shut main switch off to basically “reset” so it will ignite again. Then it repeats its self. I’ve had nothing but problems with this for the lots 7 years. I’m ready to run it over with the bull dozer and install a fire place

      2. Hi Thomas! So sorry to hear that you have had all these problems with your furnace! This sounds like this could be a control board problem since you are having erratic lighting of the gas. You would need to do some testing with a voltmeter to actually determine where the problem is when the problem occurs. I would suggest testing all the safety controls (pressure switch, limit, and rollouts) when the problem occurs to make sure all the safety controls are staying closed and allowing current to flow through them. Are you getting a constant 24 volts AC between W and C when the furnace has problems? We have a PDF furnace flow chart that should help you find and fix the problem on the following page: and lots of furnace troubleshooting questions, answers with video explanations on the following page: I hope this helps you find and fix the problem. Steve

  3. Mr. Steve,

    Thank you for all your answer which it help us the homeowners a lot, question in order for my a/c to work do I need to have the gas flow on the furnace, another question I used to have 6 wires going to from thermostat to the control board, I replaced with 5 wires the gauge of the wires bit thicker, on the 6 wire I was using only 5 out 6 any suggestions would be appreciated, thank you again Mr. Steve

    1. Hi Luis! No sir, you do not need to have the gas valve on or the gas on for you to be able to use your air conditioner. Just remember to turn the gas back on when you get into heating season next year. The wire gauge should not make a difference. The bigger the wire size the better. Most thermostat wire is 18 gauge which is good. Mixing the wire sizes should not hurt a thing. I hope you have a great and blessed week! Steve

  4. Hi Steve,
    I have a 2009 Carrier Infinity 96 natural gas furnace (58MVB100) installed horizontally in my attic.
    The secondary heat exchanger was leaking and the technician replaced it.
    Now it might stay on for 30 minutes, 1 hour or 2 and shut down. He told me the flame going through the top two burners/primary heat exchanger didn’t look right and were causing the gas control area to overheat and tripping a limit switch or flame roll out switch. He subsequently replaced all 5 burners but the problem persists. During his latest test after troubleshooting, a wire inside the gas control area actually melted and tripped the breaker in the garrage. He says he is at his wit’s end and I need a new replacement furnace. Is there anything you might suggest for me to ask him to check. I appreciate your generousity and service support at this website. Thanks Lucas

    1. Hi Lucas! This sounds like you have a bad primary heat exchanger or maybe one of the heat exchangers are stopped up and not allowing the hot exhaust gas to run through and out the vent. I would think that the pressure switch would not work and you would be getting a pressure switch error code if the heat exchanger is stopped up. Since the furnace is overheating make sure the draft inducer is working at full speed. If the inducer has a capacitor make sure the capacitor is good. See if the gas valve pressure can be adjusted to a lower pressure so the furnace does not overheat. If the burners are not burning correctly then your heat exchanger is probably stopped up or you have a crack in the heat exchange. Most of the Carrier furnaces have a lifetime heat exchanger warranty. The problem is that you would have to pay labor for getting a new heat exchanger installed. Installing new heat exchangers is not easy so depending on the labor cost it might be better to get a new furnace. Sorry that I can not be of much help. Steve

  5. I have a York furnace. I have replaced igniter, flame sensor, and limit switch. However, the burner come on but shuts off after 2 monutes. Running out of ideas and don’t want to keep buying parts and not fixing the problem.

    1. I would suggest that you check your safety controls (limit, pressure switch and rollouts) to make sure they are staying closed (current running through them) when the furnace shuts off. If any of the safety controls open the connection the furnace gas will shut off. This could be the thermostat shutting the furnace off too. I would suggest checking to make sure you are getting a constant 24 to 28 volts AC between the W and C (com) terminals on your control board. This would be the thermostat wires. Also make sure all wires and connections are good and tight. I hope you can easily find and fix the problem. Steve

  6. I have a spare gas furnace I have switched out the limit switch,flame sensor and have cleaned both of them and just put a new board on it and have been repeating all the sequences I have found on line and nothin has helped it,it lights up and shuts right back off

    1. I am so very sorry to hear that you are having furnace problems over the holidays! I thought this only happened to me. I would suggest, if you haven’t already to watch the videos and do the test with a meter to see if your furnace is receiving the correct microamps to allow the flame to be sensed in the following post: I would suggest making sure the pressure switch is staying closed when the burners ignite. Make sure the ground wire coming off the furnace transformer is good and tight. I would make sure the bare copper ground wire off the power wire that comes into your furnace is properly grounded to the body of the furnace. Here are some other things that I recommend people do when they have trouble: We have lots of furnace troubleshooting advice on the following page: I would suggest going through the troubleshooting flow chart to see what is wrong: We also have lots of troubleshooting questions and answers on the following page: If you have any specific questions please let me know. Thanks! I hope you can easily find and fix the problem. God bless you and your family. I hope you get it fixed soon! Sorry that I can not be much help!

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