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How to Troubleshoot and Test Furnace Hot Surface Ignitors Videos


Below we have two YouTube videos that explain how to troubleshoot furnace ignitor problems. We hope these videos will help you troubleshoot and repair your furnace. Please send us your furnace’s model number if you would like for us to recommend a furnace part. On Rheem Ruud furnaces we will need both model number and serial number. On Bryant Carrier furnaces we will need the product number. We sell furnace hot surface ignitors on the following (5) pages: Please click here if you are interested in seeing the furnace hot surface ignitors we sell. Our email address is: We take pride in answering emails quick! We would love to help you out and have your business!

Below we have two YouTube videos that explain how to troubleshoot furnace ignitor problems. The top YouTube Video shows how to replace your furnace ignitor and flame sensor:

The YouTube Video below shows you how to test a furnace hot surface ignitor. We hope this will help you troubleshoot and repair your furnace.

You Can Search Our Site for More Troubleshooting Problems, Heating, Air Conditioning Parts and Supplies in the Google Search Box Below:

8 thoughts on “How to Troubleshoot and Test Furnace Hot Surface Ignitors Videos

  1. Hello. I have replaced the hot surface ignitor, the induction fan comes on, hot surface glows, gas comes, fire lights, burns for a couple minutes and the fan comes on then it goes out. My replacement hot surface ignitor didn’t have the same mounting bracket and its hard to get it directly in front of the flame. Is it possible that the position of the HSI is causing this problem?

    1. Hi Jen! Since the furnace is lighting and burning for a couple of minutes I would not think that the ignitor position would have anything to do with the flame going out after a couple of minutes of burn time. If the furnace was having trouble lighting the burners then I would say the ignitor is out of position. I would like to suggest that you check to make sure that the thermostat is not cutting the flame off (you should have a constant 24 to 28 volts AC between the W and C (com) terminals on your control board. If you are losing the 24 volts between W and C then you have a thermostat or thermostat wiring problem. Make sure that the limit is staying closed by touching each side of the limit to ground (any bare metal) on the furnace. You should get a constant 24 volts to ground on each terminal of the limit to ground. If not then the limit is causing the furnace flames to go out. You could have a flame sensing problem, but since the furnace is staying on for several minutes then I would think you do not have a flame sensing problem but either a limit or thermostat problem. Make sure all your wire connections are good and tight just to make sure it is not a flame sensing problem. Clean the pilot or flame sensor if you have one on your furnace. Something is cutting the gas valve off prematurely and you would need to find out what it is. Best of luck. God Bless you and your family today and always! Steve

  2. Hi Steve,

    I seem to have the opposite problem. The ignitor glows red hot for 10 seconds but there is no sparks to light the burners and then the ignitor goes dark. I have a Carrier Day and Night gas FAU, model #395CAV036075; serial #0490A05973, product #395CAV0366075AAJA.

    Do I need to replace the spark relay switch; is there one for this FAU? or replace the entire control board?

    Do you have a video to replace such board? Also, what is the part no. for the control board? cost? time to ship to SFO, CA.

    Thanks, J

    1. Hi Joe! If your furnace has a hot surface ignitor you will not see a spark to ignite the gas. The hot surface ignitor that you have should ignite the gas when the gas valve opens. Most of the time if any of your safety controls open then the control board will not allow the ignitor to glow. Just to make sure, I would suggest that you check and make sure all safety controls like your furnace’s limit, rollout and pressure switch are closed when the draft inducer is on and your furnace is calling for heat. If all your safety controls are closed and your burners are not lighting because the gas valve is not opening then I would think that you probably have either a control board problem where the gas valve relay on the control board is not sending 24 volts to the gas valve to open the gas valve or if you are getting 24 volts to the gas valve and the gas valve is not opening then you have a gas valve problem. Our parts program shows that your furnace uses control board part number CESO110057-02 which we sell on the following page: and gas valve part number: EF34CW246 which we do not stock. Yes, we have a video on the same page where we sell the board. Shipping time can be figured on the following page: The zip code you would be mailing from is our zip code: 40291 in Louisville, KY. Please remember that USPS Priority Mail is not guaranteed. USPS Express is guaranteed. I hope you can easily find and fix the problem. Steve

  3. Hot surface ignitor constantly glows after furnace is running 5min after furnace is running rollout switch trips shutting down the furnace.. I cleaned flame sensor rod,meter reads 1.1 as furnace is running. Hot surface ignitor never shuts off which gets to hot by rollout tripping it. Ignitor ohms out at 140. If u can help me with this problem I would very much appreciate it. Thanks an have a good day..

    1. Hi Darryl! Sorry to hear that you are having trouble with your furnace ignitor not going off and over-heating the roll-out switch. I would suggest trying a new ignitor first. 140 ohms is a little high and is a sign that the ignitor could be on its way out. Most of the time when this problem occurs with the ignitor not shutting off, it is caused by a stuck ignitor relay on the control board. You probably need a new control board. I would suggest unplugging the ignitor then test with a volt meter where you unplugged the ignitor. The meter should be set to “Volts AC”. See if the control board is still sending 110 to 125 volts to the ignitor. If it is then you have a stuck relay on the control board and the board will need to be replaced to solve the problem. If you would like for me to look up and try to see which control board your furnace uses then please send me your furnace’s model number and serial number to our email address: I hope you can easily find and fix the problem. Steve

  4. After so many how-to videos, and web pages, I found your page. Your video was so easily understandable and the best.

    1. Thank you so very much for your kind words! We try to help people out with the videos. Thanks! Steve

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