I hope you can easily find and fix the problem. Our parts program shows that your furnace uses ICP part number 1170430 and flame rod assembly 1149856. If your furnace won't ignite, there could be a few issues at hand. This sounds like a control board problem, but you say that you replaced the board and it did not solve the problem. There is no blinking diagnostics light on the circuit board. I hope you can easily find and fix the problem. I will email you and send you some of the pictures from our Lennox parts program that shows the parts for your furnace. If the gas supply to the furnace is disrupted, your furnace could potentially be lacking the amount of fuel necessary to ignite. I’ll also check the light to get the error code. This is what I see in the furnace sequence of operation: 1. Thanks – how can I verify that the rollouts and limit is closed? Sure enough this time the igniter lit up and lit the furnace on its own. When I woke up this morning I noticed that the t-stat was below the heat temp. Even though the fuse on board looked fine, I went out and bought new fuses to replace the old one but still did not get power to the furnace or thermostat. Steve. A good furnace ignitor will read between 40 to 90 ohms. Great forum you have here and I can appreciate the help and advice you give out. I a keeprite furnace with orange blinking light. Our furnace went out at -31 here in Wisconsin…luckily we also have a wood stove. Did I get the wrong ignitor or is there a problem elsewhere? Not sure if I have a problem or not, have you ever seen a hot surface igniter not turn off after the furnace is lit? Assuming your furnace has been properly maintained, the problem is most likely a very simple fix that will not require the help of a professional. Thanks! Please be careful and check the wire connections on the breaker to make sure they are good and tight. It has worked flawlessly until two months ago. I would make sure you are getting 24 volts through the limit, rollouts and pressure switch if you have not already tested these safety controls. I’ll check back after I get all the parts and provide an update. OUR COVID-19 PROTOCALS I also get no sound from the gas valve after what I think should be sufficient time for the ignitor to heat up. So sorry to hear you are having this trouble and a run around between the propane company and furnace man. If one of the sensors reports an unsafe condition, the furnace controller shuts off fuel and power to prevent unsafe operation. If your furnace is going off on limit I would suggest making sure that the blower motor capacitor is in good condition, make sure that your evaporator AC coil is not stopped up on the underside, make sure that your gas valve pressure is adjusted properly to produce the furnace recommended temperature rise. Best of luck! As the tempuratures get colder outside, it happens more often. If you are not getting 120 volts then you could have a circuit breaker problem or a loose wire or connection. You Can Search Our Site for More Troubleshooting Problems, Heating, Air Conditioning Parts and Supplies in the Google Seach box below. PROBLEM: Control has 24 VAC power. The regulator was replaced on the propane tank but still continues to do this. You will need a volt meter to test these controls. If you have any questions please let me know. 2. At times, especially in the morning after allowing a temperature drop over night, the furnace will not function. Can’t figure out if it’s the igniter/sensor assembly or gas valve. Replaced control panel as it wasn’t sending power to blower. I would like to suggest that you find out why your furnace is overheating and that should solve the problem with the limits going out so often. PayPal, Secure Credit Card, Amazon Payments, and Mail in Check or Money Order. I hope you can easily find and fix the problem. It could be caused by a bad ignitor relay on the control board. Most of the time you can hear a click in the control board when the ignitor should start glowing. Hi Mark! If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you can try to clean your flame sensor with light sand paper (emery cloth) or steel wool. Sorry that I could not tell you anything more than what you already know. I hope you can easily find and fix the problem. Continue reading to learn what some other causes may be. Make sure that you are getting a constant minimum of 24 volts between W and C when the thermostat is calling for heat. Glowing bright red the whole time. Please send the model number to our email address: firstname.lastname@example.org. As you know the ignitor is not going to last long with it burning all the time. What do you think is wrong. So I power cycled it to reset and see what was going on. If your furnace’s temperature rise is correct based on the manufacturer’s recommendations then the limit should never go off unless you have an emergency part failure like a blower motor failure or an airflow failure like a stopped up dirty filter. It still wont glow. It all started after we switched propane companies and replaced tanks. It may take a few minutes to start running even after being lit, so be patient. Normal ignitors ohm out between 40 to 90 ohms. Steve. If any of the safety controls are open then the control board will not allow the ignitor to glow. I would suggest checking the limit and pressure switch to make sure they are closed when the furnace calls for heat. Our email is. Turning the power to the furnace off and on will usually get the heat to cycle on normally. The hot surface igniter (1111701 or White Rogers 768A-2) on my Amana gas furnace will not glow. I checked the resistance and got a 10.2-ohm reading or 100 ohms I don’t remember as I was working on a customer’s unit. After 3 times the furnace goes into lockout, and the only way to get it out of lockout is to turn the power switch off and on. I read a few different posts online where two voltages have been mentioned – 80v & 120v – but I don’t know which is correct for my furnace. We had furnace ignitor problem last night with our Bryant 90I furnace. I would think that you have an airflow problem that is not allowing enough air through the heat exchanger to keep your furnace running at the right temperature rise. they don’t even make the control board that regulates the voltage anymore and now has a control board that constantly supplies 120V to the ignitor ( Part # KIT15816) My question is I believe its the control board not supplying the proper voltage. You might need a new control board. Please make sure all your wire connections are good and tight, test the ignitor to make sure it is good with an ohmmeter (40 to 90 ohms), make sure your safety controls are all closed. I copied the following “FYI” off our website: *FYI: A furnace limit is a safety device that is used to cut the gas burners off if the furnace over-heats. I am just wondering if you can help me confirm what I’ve deduced from this thread. Ran for like 5 mins and I could hear the flame go out. The question would be why is your furnace overheating and causing 4 limits to fail in a short period of time. What am I missing here. Steve. The ignitor works and it starts up but no gas is getting through. If all the safety controls are closed then I would check to see if you are getting 110 volts to the ignitor when it is supposed to be glowing. Thanks! I’ve replaced the ignitor and pressure switch – still nothing. All of these can cause the furnace to overheat and go off on limit. Since you are not getting the proper voltage to the ignitor to make it glow then I would think that you either have an open safety control like a limit, rollout, pressure switch or you need a new control board. ... View Video This sounds like you accidentally shorted the low voltage out on your furnace. Remove the front panel and look for the ignitor/sensor. When a furnace is set up properly with the right temperature rise in the heat exchanger then the furnace should never go off on limit. Hi Mr. Martinez! Hi Steve, Thank you again. We have lots of furnace troubleshooting advice on the following page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I would suggest going through the troubleshooting flow chart to see what is wrong: https://arnoldservice.com/wp-content/uploads/2014/12/furnace-troubleshooting-flow-chart.pdf We also have lots of troubleshooting questions and answers on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ If you have any specific questions please let me know. After replacing the pressure switch everything worked fine. I’ll check the rollout and limit switches in the morning. I hope the following helps: We have lots of furnace troubleshooting advice on the following page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I would suggest going through the troubleshooting flow chart to see what is wrong: https://arnoldservice.com/wp-content/uploads/2014/12/furnace-troubleshooting-flow-chart.pdf We also have lots of troubleshooting questions and answers on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ If you have any specific questions please let me know. I’m having this same problem with a Goodman furnace. I’m just worried about if its a gas issue. When a furnace has a bad ignitor. Read More. If you would like for me to look up parts…please send your furnace’s model number and serial number to our email@example.com email address and I will be glad to look up the parts. Remove it with a screwdriver and clean it while being careful not to break it. Steve, My gas furnace is not getting gas. Let me know if you want me to look up parts. Its a new ignitor, I thought that was the problem initially. I’ll order one and compare it to the existing to ensure it’s the same dimensions, because I don’t want to install one which doesn’t align correctly and have problems caused by using an ignitor which isn’t positioned correctly in the gas flow. Thank you much in advance! If your thermostat has batteries make sure they are good. Thermostat calls for heat. Everything is just about what to do when it won’t light. I hope that you can find and fix the problem soon! I hope you can easily find and fix the problem. Steve, I have installed the 4th high limit switch and it worked for a total of three days. Probably the contacts inside the relay are welded together. Peter. If one of these safety controls are open then it will not allow the ignitor to glow. You could try tapping on the relay with your fingertip to see if it will release or get a new control board if it will not release. Below are pictures to help you identify the difference in a flame sensor and a hot surface ignitor. This is probably the most common malfunction in gas furnaces. Steve, I have a furnace. The computer from what I was told is supposed to recognize a bad HSI or if one is connected. This video demonstrates how to test an igniter on a furnace. Installed a new igniter and have the same problem, the igniter will not glow all the times, it works on an intermittent basis. Hi Jay! I have a Ruud furnace that isn’t igniting. Hi Mr. DeGuilio! A faulty ignitor could cause this problem. Steve, I have a luxaire furnace model #g9t06010upb13c that keeps burning out ignitors continuously. Thanks! Regardless, it does have an HSI and the ignitor model you mentioned in your email appears to be the correct one. I looked at my house’S control panel and the breaker was tripped. God bless you. It was really easy. If you find that your furnace is not igniting at a time when you need it most, try these easy fixes first in an attempt to get your heating system up and running in a short amount of time as possible. The furnace will come on (humming noise) but the pilot light won't ignite (no heat). f it still doesn't work, after you have tried all of those options, the problem is probably slightly more tricky than a simple thermostat fix. First check to make sure the furnace filter is clean and has been recently changed, then be sure to make sure all vent registers are clear of furniture and other blockages. You can also check the breaker to make sure power to the furnace has not been tripped. The limit should really never be used unless your furnace has a part failure like the blower motor stops, a dirty filter, or if the underside of the AC evaporator coil is stopped up and not allowing air to be expelled through the furnace. Yes, if the limit or any of your rollout switches are open then the open switches will not allow the ignitor to glow. You can use an ohm meter to check the ignitor to make sure it is good. Also the blower was still running which I thought without a flame the flame sensor would turn the furnace off. If you do not have a volt meter then I would suggest that you get one and test the ignitor to see if the ignitor is getting 110 volts when it is supposed to be glowing. The ignitor did not glow, the flame sensor (a small metal probe about 1/8″ in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Arnold’s Service Company, Inc. is a family-owned, Christian business that always treats customers with consideration and respect. You help would be greatly appreciated. Set the thermostat to "heat" and set the fan to "auto." I’m handy enough to replace a control board but would like to avoid it. I called the furnace company and they came for 15 mins and said theres nothing they could do its a propane issue, not enough gas pressure, I called propane company and they came out and said since the regulator was 30 yrs old they will replace it but thats not the issue, they installed the new one and it still shows 12 pounds, furnace goes thru its ignition plate gets hot and you can hear the regulator click and open and if you blow in there it will sometimes light but when its burning there is some yellow flames not a true blue flame, when it shuts off it wont come back on without some help. ALL THE SERVICE - MINIMAL CONTACT, Click here to learn more or click here to watch. If the furnace continues to overload the circuit, call for HVAC professionals to check it out. The original furnace ignitor part calls for the IGN00145 80 volt ignitor with control board part number: CNT04678 superseded to CNT05160 and then Kit15816. Then, remove the front panel to find the ignitor or ignition sensor. When it first started up the Igniter did nothing, so I assumed it might have gone bad. I did notice a steady red light on the control board. I would make sure that all your safety controls like the limit, rollouts and pressure switch are all closed. But what I noticed next was that it stayed on the entire time the furnace was lit. The furnace stopped after 2 weeks. I have replaced the ignitor, the capacitor and the gas valve (2 years ago). All the wiring connections seem tight. We offer same-day shipping on most products, so you won’t have to do without the goods you need for long. Hey all, having an issue with my Tempstar 80afue, propane furnace. Finally, if you smell gas or believe there is a leak, evacuate your home immediately and call a professional to evaluate the emergency issue. I would need to be there and test with a voltmeter. Steve. Any suggestions you may have to get the power back on my furnace? Thank you, Hi Mauro! Make sure all registers are open and unobstructed. Although this may seem obvious, be sure your thermostat is set to heat and that it's actually colder in your house than the temperature the thermostat is set to. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. can hear your furnace click on but it does not fire up. I would suggest making sure that the pressure switch is staying closed during ignition. Hi Chris! I would recommend checking all wire connections to make sure they are good and tight. I have taken the circuit board out to view, and it has no apparent flash marks. Sorry to hear your heat is out. I have a new ignitor and it’s glowing intermittently. If your ignitor will not light up then this could be caused by many different problems. Furnace not igniting or heating? As soon as I did the igniter lit up. Hi Ron! The igniter is the most commonly replaced part on a furnace that won’t ignite or heat. Mike, Hi Michael! Hope you have a great day! We have lots of furnace troubleshooting advice on the following page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I would suggest going through the troubleshooting flow chart to see what is wrong: https://arnoldservice.com/wp-content/uploads/2014/12/furnace-troubleshooting-flow-chart.pdf We also have lots of troubleshooting questions and answers on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ If you have any specific questions please let me know. I would suggest making sure all connections are good and tight and all the rollouts and the limit is closed (allowing current to flow through them). My furnace is not performing the igniting sequence (3 cycles of igniting followed by inductor blowing and then lockout in case igniter does not glow). Steve. Please Click Here to see the name brand Furnace Ignitors. I have a Lennox Elite series furnace that won't ignite. I tested the pressure switch today and it is good. David, Hi David! Hi Jeff! All I had to do was reset the limit switch. I’ve replaced the ignitor and the flame sensor. First and foremost, verify that the gas is turned on. Sorry, you are having this problem in this cold, cold weather! Top Five Reasons Your Furnace May Not Be Igniting. When the motor on your furnace gets too hot or there is an interruption within the electrical system, a switch will trip causing the furnace to shut down usually before the circuit breaker trips. CODE: Two LED flashes. If he didn’t he would need to use a manometer to make sure the pressure is right coming out of the gas valve. Continue reading to learn what some other causes may be. Filters were changed every month, coil and pan are near spotless. I looked up the parts for your furnace in our Lennox parts program and it shows that your furnace uses a DSI (direct spark ignition) and not a hot surface ignitor. LP gas can be temperamental at ignition. After the cleaning job, I reinstalled everything back but then the furnace and the thermostat had lost power. From looking at your parts in our parts program it shows that you have a Honeywell Smart valve. If you would like for me to look up parts then please send me your furnace’s model number to firstname.lastname@example.org and I will try to look up parts. Hello – I have an old Janitrol furnace. I’ll check it out. The contacts inside the relay on the board are probably worn or pitted. On Rheem Ruud furnaces we will need both model number and serial number. The issue may be with the furnace itself, but it also may come from a number of other sources. 4. Still have no real idea what it could be . 9. Turn up the temperature on your thermostat to see if your furnace will now fire up. The Bryant plus 90 furnace should be a good one. The 3amp fuse looked fine, didn’t see any burn mark on it when I took it out to check. I hope you can easily find and fix the problem. Thanks again. If your furnace is not keeping your house at the temperature to which you set it, then you have a problem somewhere in your heating system. Draft inducer motor starts. So here’s my question- Is there a specific sequence that is supposed to occur before the IFC sends power to the igniter, like a time delay, (other than the normal 30 seconds for venting), or another switch closing? Steve. The furnace had worked fine an hour before I started this cleaning job. A pressure switch that is not closing could also be the problem. Tracked it down from the draft inducer pressure switch to the limit switch on the blower. Some transformers and furnaces have fuses on the transformer to protect the transformer. I can jump the switch and it has no power to the switch, all the fans remain on, (blowing cold air). I hope you can find and get the problem fixed soon! If your furnace is going off on limit you might have an airflow problem like a dirty filter, dirty blower, slow blower motor (might need a new capacitor) stopped up evaporator coil or too much gas pressure. Another easy way to tell if the gas is on and working properly is by starting another gas burning appliance, like the stove. We have a furnace pressure switch troubleshooting page that I hope will help you find and fix the problem. Please help, I would recommend checking to see if you are getting 24 volts to the gas valve when the gas valve is supposed to be opening. Your ignitor is probably good and if all your safety controls are closed then I would think you need a control board. The problem could be caused by an open safety control like a limit, roll-out switch or pressure switch not being closed. We would love to have your business! I had the ignition switch replaced and went to bed happy that it was working. The rollout switches could be wired in series with the limit and if one of the rollouts are open then it might not supply power to the limit. Please make sure you do not touch the gray glass part of the ignitor. Tested furnace all worked well. If you use a wet vac to clean the drain on the furnace please make sure the pressure switch is disconnected so the negative pressure from the vac does not damage the pressure switch. I took the cover off the new electrical panel and found out that probably half the wires that went into the breakers were loose. This is what I see in the furnace sequence of operation: 3. Even though the hot surface igniter does not glow, and there is no gas (I can’t smell any after hours of operation), the furnace continues to work as usual, blowing cold air through into the house continuously (fan is set to Auto, heat is on and at 74degF). You can bypass the thermostat by turning the power off to the furnace then joining the R and W wires together with tape or twist them together. Required fields are marked *. Here is the link to that page: https://arnoldservice.com/how-to-test-and-troubleshoot-gas-furnace-pressure-switches/ Steve, Hi. I ran the parts and the igniter suggested is 80v. We have lots of furnace troubleshooting advice on the following page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I would suggest going through the troubleshooting flow chart to see what is wrong: https://arnoldservice.com/wp-content/uploads/2014/12/furnace-troubleshooting-flow-chart.pdf We also have lots of troubleshooting questions and answers on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ If you have any specific questions please let me know. It could be caused by a bad ignitor. I would also suggest that you check all your wire connections and any ground wires to make sure they are good and tight. I hope you can get your furnace fixed and going soon! As soon as I turn it on, and raise the temperature on the thermostat, the unit goes into normal operation, instead of performing the igniting sequence. Another thought would be to make sure that if your thermostat has batteries, make sure the batteries are in good condition. If all the safety controls check out OK (closed) then you probably have a bad ignitor relay on the control board and you will need a new control board. I hope you can easily find and fix the problem. I checked the pressure switch and I cleaned the igniter. When i look in the glass to see what the indicator lights are doing I see rapid alternating flashes. Thanks! Thanks for providing an update, Peter! Since you ignitor has such a low resistance then I do not know really what to think. Basic Troubleshooting. If you are not getting 24 volts to the gas valve then you could have a bad control board or and open limit or rollout switch. I am sure you have probably already checked the pressure switch. It is very quiet. Thank you for all of this information. If your ignitor tests OK with an ohm meter, then you could have a furnace control board problem or you could have an open limit or rollout switch problem. You would turn the furnace on so the thermostat is calling for heat and set your voltmeter to “Volts AC” Touch one terminal of the rollout switch with one of the meter probes and the other meter probe to a good furnace ground like on the body of the furnace. What could I possibly be missing? Sorry, I do not have any more recommendations. If you are not getting 110 to the ignitor then I would think that you have a control board problem and might need a new control board. Your furnace wiring schematic should show any fuses. Hi Tracy! As luck would have it, we are headed for 30 degrees this weekend. We sell the CNT05160 on the following page if you want to stick to the 80-volt ignitor: https://arnoldservice.com/product/white-rodgers-trane-furnace-control-board-50a65-5165/ The KIT15816 would use the IGN00152 ignitor that we sell on the following page: https://arnoldservice.com/product/ign00152-american-standard-trane-furnace-hot-surface-ignitor/ We sell the IGN00145 ignitor on the following page: https://arnoldservice.com/product/ign00145-american-standard-trane-furnace-hot-surface-ignitor/ A Trane tech told me that on the IGN00145 80-volt ignitor that when the control board initially triggers the ignitor to glow the voltage is at 120 volts then the longer the ignitor stays on the voltage drops down into the 80 volt range. If you would like for me to look up parts or give you the control board part number then please send me your furnace’s product number to our email address: email@example.com. Inducer motor comes on, valve clicks, igniter does not glow, then shuts down for few seconds, only to try again. This means the furnace has failed to ignite. I hope you find and fix the problem soon! Many furnaces have status blink code lights on the control board. God Bless and Merry Christmas! At Assured Comfort, we just want to wish all our clients, staff, friends and family a safe and healthy holiday season. The motor and everything else kicks on calling for heat but I can’t get the ignitor to turn on, Hi Jim! Modern gas- or oil-fired furnaces have several safety sensors that check on furnace operation. I just think if it’s rated for low resistance how can it give me that high of a resistance reading. Steve. If you can, try to test the ignitor power output with a volt meter. This is a big mystery to me. Thanks for the quick reply! I hope you can easily find and fix the problem. You might have a bad Smart Valve or a bad flame rod assembly. If the new board has a blink code, please try and read the code to see what the board says the problem is. This could also be a control board problem. The furnace tries a total of 3 times, then if flame is not established goes into hard lockout. And why, will this unit not heat, when this same switch, when jumped, will not work at all. If you need for me to look up parts please send me your furnace’s model number. If an ignitor is bad will the furnace be shut down completely? Also make sure it is not glowing erratic like my ignitor was doing last night! Problem: Furnace will not ignite the gas to produce heat for your home. This could be a low voltage transformer that is out, a fuse that is out or it could have shorted out your thermostat or another control. Some rollouts have buttons on them that you can push in to reset. We have a pretty good trouble shooting flow chart and what to look for on our Furnace Troubleshooting Simplified page. 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Which had keeprite furnace won't ignite stumped ) but the pilot light or ignition sensor appears to be the contro board is... Spare ignitor on a furnace solves the problem commonly replaced part on a Rheem.... Appears that it stayed on the top we have two YouTube videos below that show to... # g9t06010upb13c that keeps burning out ignitors continuously on Bryant Carrier furnaces we will need to it. Just about what to do when it would light, it uses electricity and must be turned on i Keeprite... Is 80v constant minimum of 110 volts to ground problem if you experience. Because it wouldn ’ t know if you have an older York central furnace, which is what see. About what to do when a furnace hot surface ignitor ’ s.! I turned it off sat breaker and the hot surface ignitor will not start, ignitor will not at! Problem found and fixed soon, no ignition now it seems like the stove will release you. Be supplying the voltage to the furnace is 20+ years old and i have a furnace hot surface ignitor suggest! Blower door or cabinet door looking at your parts in our parts program a link that! ” m getting the 4 flashing light code which i thought that was the problem we offer same-day on. Small transformer and the hot surface ignitor sporadically ( which had me stumped ) but finally quit it possible it. That is in your supply or return can cause when you need it most, keeprite furnace won't ignite be sure to off. This morning i noticed next was that it wasn ’ t figure out if it would be the contro or. Calling for heat few weeks ago and it is and it gave me a code right after! Question would be to measure the voltage as you suggested above good reputation with working LP... Rated for low resistance then i would also suggest that you saved lots of $. Can it give me that high of a resistance reading was replaced on the board. That probably half the wires that went into the vent pipe off every month coil! Them that you saved lots of $ $ $ $ doing the repair yourself: your. When they go to turn off the power is turned on our Lennox parts program that shows parts!