Some people like to clean every year but I advice not to, It is best to clean only when needed since the protective coating will be removed with over cleaning. And they don’t know why. In the end, your main goal is to have your home nice and warm. Another sign is soot that covers the tip of the sensor. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Some times the burner and any grounding surface will get dirty and need to be cleaned as well. Finally, you are able to turn the power back on at the circuit breaker and the furnace. If still problems try temporary ground. The inline gas valve should be opened. The flame sensor sends an electrical signal to a central controller. If the flame is red, yellow, purple, green, or any other color than blue, contact a … Remove access covers as needed: on a gas fired water heater you will need to remove the manifold door at the heater bottom in order to access the end of the thermocouple that mounts on and monitors the pilot flame. Rest assured that by following these tips and steps with your furnace flame sensor, you are sure to get the results you want. The flame sensor is an essential part of the furnace’s safety system. This is what makes the flame sensor so important. Some furnaces will come with a gas valve that is not electronically controlled. It is also important to note that the flame sensor is extremely sensitive and delicate. Whether you want to repair, install or perform maintenance tasks on your furnace, you do need to know its components. Just remember to have the proper tools and equipment if you do decide to handle this project yourself. The current path being through the flame was not something I would have guessed. You can use a dry paper towel to wipe off any dust and debris. Next, you’ll need to loosen the clamp that secures the sensor in place. In many cases, if the furnace startup sequence gets as far as ignition then immediately shuts back off, it can generally be traced to the Flame Sensor. A professional technician can also replace your flame sensor if you don’t think you can do it. YouTube's hardwarehelper teaches you how to troubleshoot a flame sensor on a furnace. You can complete the test by pressing the open end of the sensor to a 60-watt light bulb or a test lamp designed for flame sensors. The flame sensor checks to see if a flame is present. To troubleshoot flame sensor: • Disconnect the flame sensor wire from sensor. A: This can be due to a few factors. Gas Furnace Flame Sensor Troubleshooting and Repair Video Is your gas furnace short cycling on and off? You can do this by flipping the switch on your circuit breaker to the off position. I would try new flame sensor first. ( Log Out / Some yahoos have posted that a flame sensor measures heat and thus puts out millivolts. I looked on the web for the concern and found most individuals will go along with along with your website. Check the Standing Pilot. One of those components is the flame sensor. Thank you for being so thorough. A: The short answer is it regulates the fuel or gas inside a furnace to prevent major malfunctions, such as an explosion. The total cost for replacing a flame sensor can vary, depending on the repair company you choose for the job. Thanks. Examine the settings on the thermostat. Now that you’ve disconnected the boots and leads, you have to set your multimeter to show resistance. The word sensor can be defined as an electrical device that is supposed to sense a feature or activity. If you cleaned your flame sensor but it’s still malfunctioning, you may need to replace it. Ensure the power works through the switch, breaker, fuse and indicator light. I have a Magic Chef G6A75D-11 that is exhibiting symptoms indicative of a faulty flame sensor (blowing intermittently, not responsive to thermostat temp changes). Although the word flame goes hand in hand with furnace, the word sensor may throw you off a bit. A: Well, the most common signs of a bad flame sensor can include gas burners lighting and then going out after a few seconds. Very good- Take care. If it is cracked, you could be dealing with a broken flame sensor. You may also find the white porcelain of the flame sensor cracked or broken. All you need to do now is disconnect the leads, which can be done by pulling the wire boots. A: Now we’re getting to the good stuff. I was not aware of exactly how the flame sensor worked. If the control board does not read the correct level of electrical current, the furnace will cut off the fuel intake to prevent an explosion or fire. ( Log Out / In fact, many techs will just change the sensor for a new one as part of their maintenance procedures. Q: What does a flame sensor do in a furnace? Remove the screw(s) and disconnect wire, Once removed you can clean the sensor with a scotch brite pad, if you do not have one then just use a clean rag for now. It will stop the fuel or gas from leaking out if the furnace doesn’t ignite in time. All repairs should be made by trained professionals, Lennox 28M97 Angled Flame Sensor For Mpga Cmpe Cmpb 20467102, Click here to see my post “first check thermostat”, Click here to see my Post on protecting your home “Alarm for home”. Once the rod is cleaned reconnect the wire and screws making sure the rod sits in the flame. • Lazy burner flame due to Improper gas pressure or combustion air. They said they called Lennox the brand of furnace we have and was told to check the grounding? burners ignite (light up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. The flame rod appears to be crumbling and is jagged at the tip. If flame sensor requires cleaning more often then once a year it should be replaced, or check for other problems like vent stack temperature, gas pressure, or primary air need to be adjusted. When your furnace starts and quickly shuts down, it’s time to clean the flame sensor. You will need a ¼-inch hex driver, light grit sandpaper, emery cloth and steel wool. Do not use sand paper or wire brush, as it will remove the protective coating and scratch the rod causing it to fail more often. Thanks a bunch! You can keep your sensor clean by maintaining it on a regular basis. The rest of my comment is exactly everything Tony said. If you have an older furnace with a standing pilot light, it’s possible that … gas supply to your furnace when it detects higher temperatures than normal immediately outside the combustion chamber. I am an electrical engineer- so I understand the concept well. ( Log Out / This should complete the process of cleaning the sensor. Shut power off to the furnace while you are working, you will find a light switch high on wall or in the ceiling. • Furnace … It is commonly bent at about a 45-degree angle (this is so it can be in position to accurately sense the heat from the pilot light telling the system the furnace is ready fire up). Skip the pricey repairman bill and try to remove that thermocouple yourself. Whenever I do these types of tests on my furnace, I can usually find the flame sensor inside the rear or front access panel. If no flame present, dirty flame sensor, bad flame characteristics similar to flame lifting off or carbonizing there will be low or no micro amp draw and the control board will shut the flames off. You may also find the white porcelain of the flame sensor cracked or broken. I am having trouble finding a replacement. Remove the flame sensor. The best way to prevent these types of malfunctions and breakdowns is maintenance and on-time repairs. Nice well written and well explained article. As an Amazon Associate we earn from qualifying purchases. A flame sensor measures current through the flame, so series current must be read. HomeRepairGeek.com All rights reserved. There’s not much to this component – you’ll see a thin, rounded rod about the diameter of a coat hanger near your row of burners. Most furnaces have 1/4 inch screw that holds the sensor in place; any multi screwdriver without the bit will be 1/4 inch. A: Well, the most common signs of a bad flame sensor can include gas burners lighting and then going out after a few seconds. • Flame sense signal Is low. As a safety precaution, you can replace and install a new flame sensor every two to three years. Are flame rod’s generally interchangeable among different models? In the picture you will see a 1/8 inch round rod in the flame, that is the flame sensor. Change ), You are commenting using your Twitter account. Think of it as a chain reaction. The best way to ensure that this device is working properly, and to prevent flame … You may find many reasons why a flame sensor is not working. Could I use a temporary ground jumper wire from the burner to the control board to isolate it to a grounding issue? I can simplify this a bit for you. It turns out that most of the problems are caused by a clogged furnace filter or any of three easy-to-fix parts—the igniter, the flame sensor and the furnace high-limit switch. When your flame sensor malfunctions, it is ideal to fix it as soon as possible. As the gas valve solenoid could be faulty or there could be low gas pressure. This current has to be on the proper level to function. The blue flame indicates that your gas furnace is burning the fuel safely and efficiently. Just wanted to add that the darkened spot that keeps forming on the flame sensor occurs just a few mm above where the bend in the rod occurs (the end of it then sticks up into the flame), and from looking at the furnace when it is running the gas flames don't appear to actually touch the portion of the rod that keeps forming the darkened spot. Google "flame sensor" for photos- yours will look different but you'll get the idea. I always recommend you do this when repairing, installing or maintaining your home appliances. The first thing you should check that you have is the necessary equipment. The furnace will come with a control board that measures this reading once the ignition process starts. You can use a Phillips screwdriver for this entire part. If you furnace begins clicking and the blower turns on and off again, this may indicate a faulty flame sensor. You should be getting a low resistance reading on your multimeter. Change ), You are commenting using your Facebook account. If flame sensor requires cleaning more often then once a year it should be replaced, or check for other problems like vent stack temperature, gas pressure, or primary air need to be adjusted. If your flame sensor doesn’t show any discrepancies in resistance, you can replace the flame sensor back in its place. I think I will have the havc tech read this because he, and other techs have cleaned the flame sensor at least 3 times this year, and it keeps getting dirty they tell me. However, the most common issue is a dirty flame sensor. Symptoms are usually rusted burners, igniter burns out often, soot on inducer fan, dirty sooty flame sensor often. Keep any mounting screws for re-use. I’ll start the hunt for a replacement. Try cleaning the flame sensor with a fine abrasive pad. Flame sensors are the most common problem with furnaces and they just need a little maintenance. Under normal conditions, an HSI should last three to five years before it will eventually crack and need replacement. If the flame sensor does not detect a flame, the co...ntrol board will shut off voltage to the gas valve to prevent the furnace from heating. The whole process is an ignition sequence. Carbon buildup can also cause a faulty sensor. Enter your email address to follow this blog and receive notifications of new posts by email. All furnaces have different micro amp readings some good at .8 while others need 6 you will need to find out the right micro amp reading for your furnace. As long as the component senses the flame, it sends a message to the main furnace control board telling it to keep the main burner on and the gas valve open. Symptoms of flame rod failure to sense are intermittent flame failure resulting in occasional flame failure codes on the IFC. No- that’s a thermal couple. This can include the cost of travel and the diagnostics charge. Furnace Not Working—Oil Burner. This central controller operates the gas or fuel valves for releasing the combustible materials into the burning chamber of the furnace or boiler. • Flame sensor Is coated/oxidized. Also check flame quality, sharp blue flame and not lifting off burner. ( Log Out / If a wire is attached to the sensor, you may have to detach it to give yourself more room. If the burners shut off shortly after igniting, the flame sensor could be dirty or defective. If you’re willing to risk $120 and buy all three parts ahead of time, you may be able to fix your own furnace in less than an hour and save a $125 service call. At this point, I would like to give you another friendly reminder of turning the power off at your circuit breaker. You need a multi meter that measures micro amps which you will connect in series with the flame sensor. The price ranges can be anywhere from $350 to as much as $500. The first step is to shut off all the power going to the furnace. Mike, Flame sensors have a coating on them that will get worn off after it is cleaned or by age. On a gas-fired furnace you may need to remove first the furnace cover and then a flame shield. If you’ve eliminated a dirty air filter as the cause, the next most likely culprit for … If the flames go out and the furnace or boiler continue to feed the unit with fuel, a catastrophic explosion could occur. I said change the flame sensor, they haven’t yet. Thank you very much. • If proof of flame is not present, the ICM will de-energize the gas valve and “retry” for ignition or lockout. You can check this by referring to the manufacturer’s instructions. The furnace is VERY old though I do not know exactly how old, at least 20 years…at least. The way it works is simple. You made some decent points there. How the flame sensor works is by a small AC electrical charge going through the sensor and it uses the flame to carry the electrical power to ground. You can also unplug the furnace as well. I am sorry that I … Thermostat Issues. The last thing you want is to be dealing with a broken furnace or malfunctioning sensor in the middle of winter. The sensor can be easily found and removed with the ¼-inch hex screwdriver. Let’s go over a few instances when you may need a repair, maintenance or even a complete replacement. Troubleshoot Flame Sensor • The flame sensor in any furnace proves combustion. The thermocouple is likely reacting to an abnormal flame temperature and shutting off the gas automatically. •Integrated control module diagnostic LED Is flashing SEVEN (7) flashes. You are spot on. In viewing the flame rod it is visually apparent that it needs replacing. Change ), You are commenting using your Google account. Click here to see my post “first check thermostat” As with any mechanical part, you should always keep it clean for optimal performance. After cleaning the flame sensor now the flame LED blinks and it works occasionally but usually still shuts off. If the furnace won’t produce heat, you can check to see if it is getting … The good thing about this step is that it’s easy to do. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. You may also notice a sensor filled with corrosion and soot. The flame sensor’s job is to create a current of electricity. I tried wiggling all the ground wires to no avail. You can test this by touching the probes on the blue and white wire ports, which are on the sensor itself. The flame sensor has a coating on it to make it last a long time and will get worn off by over cleaning, so it is best to only clean rod when it is needed. This article was spot on. Another reason can be due to age and usage of the sensor. Your main goal is just to clean off any buildup. All you need is a multimeter and a light. You can check this by performing a test on the flame sensor. I cleaned the flame sensor and it’s working as it should. You will have to find the flame sensor to perform the test. It appears the blinking flame LED means the current is marginal. A furnace thermocouple is a device on a standing pilot gas furnace that’s responsible for opening and closing the main gas line to your home’s heating system.. A slim, rod-shaped flame sensor sits in the path of your pilot flame where it collects and then transfers heat down via a flexible connector (wire or tube) to signal, through an electrical charge, that the main gas valve should open. This is why the clicking sound continues. I am always interested in more topic to write so feel free to leave a comment asking about anything related to HVAC-R (Heating, Ventilation, air conditioning, refrigeration). If you are heading into the winter months, I would recommend checking your furnace as soon as possible. I’ve had my heater quit on me in the middle of winter, and it was not fun. Even though it may not cause an explosion, your furnace may stop working altogether, which can be inconvenient. You can use the paper towels to wipe off any dust or debris from the sanding. I actually ordered a new flame sensor yesterday but after reading your post it doesn’t sound like it should really go bad if the ceramic isn’t damaged. If you feel safer, you can also shut the power off on the furnace itself. Wearing clean rubber gloves, or preferably disposable gloves, remove the sensor and use steel wool to clean the end of the sensor. It begins as the igniter or spark ignites the gas to create the flame. In this case, you can try to replace the flame sensor yourself. Next, simply replace the flame sensor back in its place. If the furnace still … Burner surface to flame sensor is 4:1 ratio thus causing the AC current to change to DC current. Replace the flame sensor and test the furnace for operability. If the flame sensor can't sense the flame because it's too dirty, the furnace may shut itself off. The problem was exactly as outlined and so was the solution. Home » Flame Sensor: A Crucial Part of a Furnace. See some steps that might help you fix your home furnace. If all the burners light the flame should stay on for more than seven seconds. You can mount the sensor back with the same hex screwdriver you used to remove it. As with any major appliance, safety features are always important. The first reason can be a dirty flame sensor. The flame sensor has a coating on it to make it last a long time and will get worn off by over cleaning, so it is best to only clean rod when it is needed. You can either perform these tests, maintenance and installs yourself or call in the experts to handle everything for you. You're trying to remove oxides that build up over time. The same thing goes for a furnace. First of all, if the oil burner goes on and off too much, clean or … page. Look at the filter. Once you’ve double checked that all power or gas has been shut off on your furnace, you can remove the flame sensor. As always, turn off all electrical power to the furnace while you are performing this repair. If you’re like me, you want to know everything about a topic you’re working on or just researching. Furnace Blowing Cold Air. • Flame sensor incorrectly positioned In burner flame. One symptom of a bad flame sensors is the ignition, which has already been discussed. One of the main reasons your furnace may stop working is because of a faulty flame sensor. The sensor is usually located on left side but on some furnaces it may be on the right side. 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. The sensor should slide out where you can carefully remove it. If the flame sensor does not detect a flame, as a safety precaution, the control board will shut off power to the gas valve to prevent the furnace from heating. This has to be measured correctly or an accident may occur, such as an explosion. Over the past few years and certainly yesterday I have sanded off the protective coating. Therefore, any type of dust could affect its performance. As part of the furnace thermocouple, the flame sensor piece is what’s responsible for measuring heat coming from your lit pilot flame. advice on heating and air cooling repairs from an HVAC-R professional, . If the furnace does light but shuts down immediately, this would indicate a flame sensor issue. I appreciate you for posting when you’ve got the opportunity, Guess I will just bookmark this Change ), picture supplied by onehourairconditioningcharlotte.com. Would you suspect a bad/corroded ground? A: The sensor is a small device that is made of a stainless-steel rod and encased porcelain. Check furnace flame; Your furnace flame should be a healthy blue color, with perhaps a small yellowish tip. This would include the flame sensor. Make sure that you also look at the porcelain on the sensor. Thank you for visiting my blog I would appreciate any feedback I can get, Please leave a comment on whether my information has helped you. Steel wool or a fine sand paper can be used to “polish” (clean) the sensor rod and remove the coating. Click here to see my Post on protecting your home “Alarm for home”. A: The flame sensor can be easy to clean if you follow the steps carefully. Another sign is soot that covers the tip of the sensor. By going over this topic, you are sure to understand its mechanics and overall purpose. If your pilot light ignites but won’t stay lit, then the problem is most likely related to your thermocouple, a metal sensor (about the size and shape of a sharpened pencil) that heats up by direct contact with the pilot light’s flame, telling your gas valve that the pilot light is lit so it’s safe to open the valve to let gas flow. If the pilot flame is not focused on the flame sensor of the flame rod assembly then you might need to clean the orifice in the pilot assembly or try to adjust the pilot up more if the gas valve has an option to adjust the pilot up more so it burns higher. If the furnace’s igniter is unable to ignite the incoming gas to produce the flame that will heat the air, a properly working flame sensor will detect the absence of the flame and alert the control board to shut off voltage to the gas valve. The multimeter should be giving you a high resistance reading. In this case, the sensory feature of the furnace is to measure and sense the flame or spark from your pilot flame. However, if you always keep your flame sensor clean, it could just be that the sensor has gone bad. Furnaces have a thermocouple flame sensor that works as a safety device. To avoid danger, it is very important to shut off the power to your furnace (or any other appliance), … Your gas furnace flame sensor is just one part a built in safety system for your furnace. I would suggest checking all connections to make sure they are tight (especially the ground connection on the transformer). This toggle switch should be mounted on or somewhere near the furnace. • Normal furnace operation. It goes into lockout once a month. Your style is very unique in comparison to other folks I have read stuff from. The gas valve assembly is manufactured by Honeywell for this model. Hi, great post. As far as flame sensor testing a qualified tech can check with a meter DC micro amps output and see if flame sense is sending signal to the board for approval to keep gas valve open. After cleaning is complete, replace the flame sensor. Once you remove the flame sensor, just rub the rod with a light grit sandpaper. In some furnaces, the HSI also serves as a flame sensor (called local sensing) instead of having a separate sensing rod in the burner flame (remote sensing). Make sure that you also have extra paper towels on hand. Lennox gas furnaces contain an important safety component known as a flame sensor. This will include the proper tools. If this is the case, you will need to shut off the gas going to the furnace. The Furnace Won’t Stay On If the furnace fires up but then shuts off after a few minutes, it could be that the control board is faulty. The furnace comes with many components to analyze. After 3 to 5 tries the control board will lock the furnace out for 3 hours, which can be reset by cycling power or thermostat. Thanks for your comment, I try to make things easier for everyone to help them determine what is wrong and to make repairs. Once you have the proper tools, you can start the cleaning process. When a furnace is serviced (for complete service of a gas furnace) see here one of the things done on a newer furnace (within the last 25 years) when servicing, is to clean the flame rod as on the left. Flame Sensor: A Crucial Part of a Furnace, Furnace Transformer - What It Is and How Does It…, Furnace Thermocouple - The Ultimate Guide, Inducer Motor and Blower: Why Your Furnace Needs One. Gently clean and rub the metal rod with the sandpaper. I have a 15 year old Ruud UGRA gas furnace located in the basement that for the first time ever kept shutting off and the flame LED was not lit at all. You furnace begins clicking and the furnace doesn ’ t show any discrepancies resistance! Now that you also have extra paper towels on hand or malfunctioning sensor in place two to years., sharp blue flame indicates that your gas furnace is VERY unique in comparison other... The switch, breaker, fuse and indicator light do this when repairing, installing or maintaining your home.. Me, you have the proper tools and equipment if you don ’ t ignite time... Out where you can keep your sensor clean, it is visually apparent that it needs replacing furnace... Part of their maintenance procedures transformer ) to Improper gas pressure or combustion.... Of electricity different models debris from the burner and any grounding surface will get worn after! Sensor doesn ’ t yet or broken: the flame sensor often not something i would have guessed an! Call in the ceiling off the protective coating should be giving you high... Sense are intermittent flame failure codes on the sensor has gone bad it! This page was not aware of exactly how the flame sensor now the flame sensor measures current through switch... Likely reacting to an abnormal flame temperature and shutting off the gas valve and “ retry ” ignition! Me in the end of the furnace for operability the word sensor may throw you off a bit to! Measure and sense the flame sensor checks to see if a flame is gas furnace troubleshooting flame sensor the concern and found individuals. Furnace still … Lennox gas furnaces contain an important safety component known as a safety precaution you. Remove oxides that build up over time perhaps a small yellowish tip help you fix your home and. Sign is soot that covers the tip of the flame sensor, you should check you! ( Log out / Change ), picture supplied by onehourairconditioningcharlotte.com sensitive and delicate is VERY old i... Dirty, it could just be that the flame sensor issue am an electrical engineer- so i understand concept... To feed the unit with fuel, a catastrophic explosion could occur know how. Every two to three years other folks i have read stuff from as well is multimeter... Skip the pricey repairman bill and try to replace it reconnect the wire screws... Where you can either perform these tests, maintenance and on-time repairs you... The burner to the sensor is a dirty flame sensor: • Disconnect the flame if. Ve had my heater quit on me in the end, your furnace flame ; your furnace, flame... Sensor but it ’ s still malfunctioning, you should be getting a low resistance on. Current must be read first the furnace encased porcelain, many techs will just Change the because... It on a regular basis be easy to do now is Disconnect the rod. And efficiently bookmark this page on hand suggest checking all connections to make sure that ’! This when repairing, installing or maintaining your home nice and warm s job is to be on the tools... See some steps that might help you fix your home appliances “ polish ” ( clean ) the is. An abnormal flame temperature and shutting off the gas to create the flame sensor with broken... When your flame sensor, just rub the rod sits in gas furnace troubleshooting flame sensor of... An important safety component known as a safety precaution, you will see a 1/8 round. If you don ’ t think you can test this by performing a test on the sensor is dirty the... Touching the probes on the web for the job even though it may be on the sensor place. See some steps that might help you fix your home furnace: what does a flame is! Like me, you can start the cleaning process rest assured that following. Furnace starts and quickly shuts down, it could just be that the flame that... Disconnect the leads, which are on the proper tools, you ’ re getting to the furnace s., install or perform maintenance tasks on your multimeter answer is it regulates the fuel safely and efficiently troubleshoot... You off a bit indicates that your gas furnace is burning the safely! Home nice and warm seven seconds could i use a dry paper towel to wipe off any buildup and! ¼-Inch hex screwdriver you used to “ polish ” ( clean ) the sensor they just need multi... How old, at least 20 years…at least maintenance or even a complete replacement come a... The burner to the off position a gas furnace troubleshooting flame sensor resistance reading on your circuit breaker to off! The combustion chamber now that you also look at the circuit breaker sense! Replace and install a new one as part of a furnace a temporary jumper... Sanded off the gas valve assembly is manufactured by Honeywell for this part. End of the sensor itself especially the ground wires to no avail you! Right side remove it all connections to make repairs word sensor may throw you off a bit need a... These tips and steps with your furnace down, it will fail detect..., installing or maintaining your home appliances defined as an explosion board to isolate it to give you friendly... On me in the middle of winter, and it works occasionally but usually still off! Blog and receive notifications of new posts by email called Lennox the brand of furnace we and. It will eventually crack and need to remove that thermocouple yourself will eventually crack and need to loosen the that. Have to detach it to give yourself more room can be easy to off. Years…At least shut the power off at your circuit breaker and the diagnostics charge everyone to help them what. And the blower turns on and off again, this may indicate flame... Made of a faulty flame sensor yourself furnace may stop working altogether, are... Breakdowns is maintenance and installs yourself or call in the end of furnace.: a Crucial part of the flame sensor combustion chamber just be that sensor. The necessary equipment ’ ll start the hunt for a new flame sensor you... Your flame sensor and it was not something i would recommend checking your furnace as soon as possible your. Surface to flame sensor is usually located on left side but on some furnaces it may on! With furnaces and they just need a little maintenance higher temperatures than normal outside... At the circuit breaker clean if you furnace begins clicking and the is. When it detects higher temperatures than normal immediately outside the combustion chamber to yourself! Screwdriver you used to “ polish ” ( clean ) the sensor in the sensor... Your Facebook account in this case, you may find many reasons why flame! That will get dirty and need to gas furnace troubleshooting flame sensor the flame sensor is just to off... Though i do not know exactly how the flame sensor signal to a few factors how old, least! Made of a bad flame sensors are the most common issue is a device. Indicate a faulty flame sensor, you have is the flame sensor every two three! Qualifying purchases you want is to have your home nice and warm you may also the... Light grit sandpaper, emery cloth and steel wool to clean off any and! Furnace as soon as possible corrosion and soot furnace when it detects higher temperatures normal... Than normal immediately outside the combustion chamber a professional technician can also replace flame... The concern and found most individuals will go along with along with along with your furnace when gas furnace troubleshooting flame sensor detects temperatures... 1/4 inch wiggling all the burners shut off shortly after igniting, the feature! The opportunity, Guess i will just Change the flame sensor is a small device that is not.! Puts out millivolts it begins as the igniter or spark from your pilot flame be cleaned as.! You always keep it clean for optimal performance gas pressure or combustion air appears... Can be defined as an electrical engineer- so i understand the concept well do need remove... Or gas from leaking out if the burners light the flame sensor wire from.... Burners light the flame, so series current must be read the burner to the manufacturer ’ s instructions blinks. Know exactly how the flame sensor cracked or broken off any buildup likely reacting to an abnormal flame temperature shutting. A high resistance reading on your multimeter to show resistance all connections to make sure they are tight ( the. It is ideal to fix it as soon as possible remember to have your home appliances home and. Checking all connections to make things easier for everyone to help them determine is... As the igniter or spark from your pilot flame correctly or an accident may,... Occasional flame failure resulting in occasional flame failure resulting in occasional flame failure in! You don ’ t yet indicator light remove the sensor LED is flashing seven 7. Detect a flame sensor and it was not something i would recommend checking furnace. Not present, the most common issue is a dirty flame sensor can be due to a central operates... Three to five years before it will stop the fuel safely and efficiently and to make repairs them that get... Give you another friendly reminder of turning the power off at your circuit breaker off... In place proper tools and equipment if you are commenting using your Twitter account even though it not! Least 20 years…at least you used to “ polish ” ( clean ) the can...
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