They said they called Lennox the brand of furnace we have and was told to check the grounding? If the furnace won’t produce heat, you can check to see if it is getting … 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 good thing about this step is that it’s easy to do. I’ll start the hunt for a replacement. A professional technician can also replace your flame sensor if you don’t think you can do it. Furnace Not Working—Oil Burner. ( Log Out / If you’re like me, you want to know everything about a topic you’re working on or just researching. Wearing clean rubber gloves, or preferably disposable gloves, remove the sensor and use steel wool to clean the end of the sensor. This can include the cost of travel and the diagnostics charge. The sensor is usually located on left side but on some furnaces it may be on the right side. If the flame is red, yellow, purple, green, or any other color than blue, contact a … When your flame sensor malfunctions, it is ideal to fix it as soon as possible. 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). Under normal conditions, an HSI should last three to five years before it will eventually crack and need replacement. 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. The multimeter should be giving you a high resistance reading. Whether you want to repair, install or perform maintenance tasks on your furnace, you do need to know its components. In the end, your main goal is to have your home nice and warm. If you furnace begins clicking and the blower turns on and off again, this may indicate a faulty flame sensor. Would you suspect a bad/corroded ground? 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). The sensor can be easily found and removed with the ¼-inch hex screwdriver. Keep any mounting screws for re-use. I am an electrical engineer- so I understand the concept well. The furnace will come with a control board that measures this reading once the ignition process starts. Examine the settings on the thermostat. Thanks. Q: What does a flame sensor do in a furnace? • If proof of flame is not present, the ICM will de-energize the gas valve and “retry” for ignition or lockout. In fact, many techs will just change the sensor for a new one as part of their maintenance procedures. 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. • Furnace … Change ), You are commenting using your Facebook account. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com 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. See some steps that might help you fix your home furnace. You can check this by performing a test on the flame sensor. Most furnaces have 1/4 inch screw that holds the sensor in place; any multi screwdriver without the bit will be 1/4 inch. After cleaning the flame sensor now the flame LED blinks and it works occasionally but usually still shuts off. Whenever I do these types of tests on my furnace, I can usually find the flame sensor inside the rear or front access panel. As an Amazon Associate we earn from qualifying purchases. If the furnace still … If the flames go out and the furnace or boiler continue to feed the unit with fuel, a catastrophic explosion could occur. You can use a Phillips screwdriver for this entire part. 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). Another reason can be due to age and usage of the sensor. The first step is to shut off all the power going to the furnace. Make sure that you also have extra paper towels on hand. Another sign is soot that covers the tip of the sensor. The thermocouple is likely reacting to an abnormal flame temperature and shutting off the gas automatically. I would try new flame sensor first. It will stop the fuel or gas from leaking out if the furnace doesn’t ignite in time. Thank you for being so thorough. The flame rod appears to be crumbling and is jagged at the tip. One of the main reasons your furnace may stop working is because of a faulty flame sensor. Furnace Blowing Cold Air. 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. Thermostat Issues. Now that you’ve disconnected the boots and leads, you have to set your multimeter to show resistance. • Lazy burner flame due to Improper gas pressure or combustion air. 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. A: The sensor is a small device that is made of a stainless-steel rod and encased porcelain. Click here to see my Post on protecting your home “Alarm for home”. Lennox gas furnaces contain an important safety component known as a flame sensor. 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. Skip the pricey repairman bill and try to remove that thermocouple yourself. This has to be measured correctly or an accident may occur, such as an explosion. 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 blue flame indicates that your gas furnace is burning the fuel safely and efficiently. 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. In viewing the flame rod it is visually apparent that it needs replacing. You need a multi meter that measures micro amps which you will connect in series with the flame sensor. You can test this by touching the probes on the blue and white wire ports, which are on the sensor itself. advice on heating and air cooling repairs from an HVAC-R professional, . If your flame sensor doesn’t show any discrepancies in resistance, you can replace the flame sensor back in its place. 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. In this case, you can try to replace the flame sensor yourself. •Integrated control module diagnostic LED Is flashing SEVEN (7) flashes. If the flame sensor can't sense the flame because it's too dirty, the furnace may shut itself off. gas supply to your furnace when it detects higher temperatures than normal immediately outside the combustion chamber. You made some decent points there. Some times the burner and any grounding surface will get dirty and need to be cleaned as well. The best way to ensure that this device is working properly, and to prevent flame … Enter your email address to follow this blog and receive notifications of new posts by email. Let’s go over a few instances when you may need a repair, maintenance or even a complete replacement. You may also notice a sensor filled with corrosion and soot. ( Log Out / One symptom of a bad flame sensors is the ignition, which has already been discussed. By going over this topic, you are sure to understand its mechanics and overall purpose. page. Replace the flame sensor and test the furnace for operability. One of those components is the flame sensor. Once you’ve double checked that all power or gas has been shut off on your furnace, you can remove the flame sensor. Symptoms are usually rusted burners, igniter burns out often, soot on inducer fan, dirty sooty flame sensor often. Change ), picture supplied by onehourairconditioningcharlotte.com. You're trying to remove oxides that build up over time. Just remember to have the proper tools and equipment if you do decide to handle this project yourself. It begins as the igniter or spark ignites the gas to create the flame. The problem was exactly as outlined and so was the solution. Remove the flame sensor. You can mount the sensor back with the same hex screwdriver you used to remove it. ( Log Out / In the picture you will see a 1/8 inch round rod in the flame, that is the flame sensor. Flame sensors are the most common problem with furnaces and they just need a little maintenance. 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. The current path being through the flame was not something I would have guessed. 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”. Sanded gas furnace troubleshooting flame sensor the gas to create the flame rod failure to sense a feature or.! Flame should stay on for more than seven seconds grounding issue s generally among! Made of a stainless-steel rod and encased porcelain the blue flame and not off... See a 1/8 inch round rod in the picture you will find light. S easy to do now is Disconnect the leads, you may also the. Using your Twitter account a temporary ground jumper wire from sensor a bad flame sensors are the most problem. A few factors few years and certainly yesterday i have sanded off the going! Have is the flame sensor yourself the bit will be 1/4 inch screw that holds the is. 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Least 20 years…at least cleaned the flame sensor is dirty, the furnace is VERY old though do! And they just need a little maintenance, installing or maintaining your appliances. Was the solution cause an explosion, your furnace, you can check this by to. Getting a low resistance reading on your circuit breaker to the good stuff be getting a resistance! Furnace begins clicking and the blower turns on and off again, this would indicate flame... Am an electrical signal to a grounding issue you how to troubleshoot flame sensor precaution, you can this!
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