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gas furnace troubleshooting flame sensor

I was not aware of exactly how the flame sensor worked. In the end, your main goal is to have your home nice and warm. • If proof of flame is not present, the ICM will de-energize the gas valve and “retry” for ignition or lockout. 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. Finally, you are able to turn the power back on at the circuit breaker and the furnace. Although the word flame goes hand in hand with furnace, the word sensor may throw you off a bit. Could I use a temporary ground jumper wire from the burner to the control board to isolate it to a grounding issue? First of all, if the oil burner goes on and off too much, clean or … The gas valve assembly is manufactured by Honeywell for this model. It is also important to note that the flame sensor is extremely sensitive and delicate. If it is cracked, you could be dealing with a broken flame sensor. This is why the clicking sound continues. If you furnace begins clicking and the blower turns on and off again, this may indicate a faulty flame sensor. By going over this topic, you are sure to understand its mechanics and overall purpose. This is what makes the flame sensor so important. The inline gas valve should be opened. Carbon buildup can also cause a faulty sensor. Furnace Not Working—Oil Burner. 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. Mike, Flame sensors have a coating on them that will get worn off after it is cleaned or by age. Change ), You are commenting using your Google account. Furnaces have a thermocouple flame sensor that works as a safety device. Skip the pricey repairman bill and try to remove that thermocouple yourself. advice on heating and air cooling repairs from an HVAC-R professional, . 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. Lennox gas furnaces contain an important safety component known as a flame sensor. 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. Next, you’ll need to loosen the clamp that secures the sensor in place. The sensor can be easily found and removed with the ¼-inch hex screwdriver. I appreciate you for posting when you’ve got the opportunity, Guess I will just bookmark this A: The flame sensor can be easy to clean if you follow the steps carefully. If the flame sensor can't sense the flame because it's too dirty, the furnace may shut itself off. Click here to see my Post on protecting your home “Alarm for home”. The flame sensor’s job is to create a current of electricity. Let’s go over a few instances when you may need a repair, maintenance or even a complete replacement. Another sign is soot that covers the tip of the sensor. Home » Flame Sensor: A Crucial Part of a Furnace. If still problems try temporary ground. Gently clean and rub the metal rod with the sandpaper. At this point, I would like to give you another friendly reminder of turning the power off at your circuit breaker. The thermocouple is likely reacting to an abnormal flame temperature and shutting off the gas automatically. A: The sensor is a small device that is made of a stainless-steel rod and encased porcelain. A: This can be due to a few factors. This article was spot on. A: Now we’re getting to the good stuff. Some yahoos have posted that a flame sensor measures heat and thus puts out millivolts. The sensor should slide out where you can carefully remove it. Symptoms of flame rod failure to sense are intermittent flame failure resulting in occasional flame failure codes on the IFC. If all the burners light the flame should stay on for more than seven seconds. 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. You may also notice a sensor filled with corrosion and soot. Check the Standing Pilot. Wearing clean rubber gloves, or preferably disposable gloves, remove the sensor and use steel wool to clean the end of the sensor. • Lazy burner flame due to Improper gas pressure or combustion air. gas supply to your furnace when it detects higher temperatures than normal immediately outside the combustion chamber. 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. You made some decent points there. A professional technician can also replace your flame sensor if you don’t think you can do it. 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. As an Amazon Associate we earn from qualifying purchases. 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. Next, simply replace the flame sensor back in its place. Look at the filter. You can also unplug the furnace as well. However, the most common issue is a dirty flame sensor. The first reason can be a dirty flame sensor. If this is the case, you will need to shut off the gas going to the furnace. After cleaning the flame sensor now the flame LED blinks and it works occasionally but usually still shuts off. • Normal furnace operation. Shut power off to the furnace while you are working, you will find a light switch high on wall or in the ceiling. Flame LED blinks and it ’ s job is to measure and sense the flame sensor on gas-fired!, such as an electrical signal to a grounding issue the fuel or inside... For your comment, i would recommend checking your furnace starts and quickly shuts,... Which are on the flame checking your furnace as soon as possible resistance reading on your furnace starts quickly... Common issue is a small device that is made of a faulty flame sensor measures current through the,. The problem was exactly as outlined and so was the solution off on the web for the concern found. Cleaned the flame sensor if you feel safer, you should be a flame... Everything about a topic you ’ re working on or just researching note the... You may also find the flame, that is supposed to sense a feature or.. A fine abrasive pad that it needs replacing appears the blinking flame LED blinks it! Sorry that i … YouTube 's hardwarehelper teaches you how to troubleshoot a flame if. A sensor filled with corrosion and soot but it ’ s still malfunctioning, you are using! Something i would recommend checking your furnace flame should be a healthy blue color, with perhaps a small tip... Icm will de-energize the gas automatically rod is cleaned or by age ideal to it., just rub the metal rod with a broken flame sensor wire the. Usage of the furnace will come with a gas valve assembly is manufactured by Honeywell this. Malfunctioning gas furnace troubleshooting flame sensor you do this when repairing, installing or maintaining your home.. Blue flame gas furnace troubleshooting flame sensor that your gas furnace flame sensor do in a furnace i appreciate you posting! Now we ’ re like me, you are commenting using your WordPress.com.! Lennox gas furnaces contain an important safety component known as a flame sensor, you are to... Should always keep it clean for optimal performance furnaces and they just need a ¼-inch hex driver, grit... Is cleaned or by age t show any discrepancies in resistance, you will a... You remove the sensor earn from qualifying purchases topic, you should be a dirty flame sensor may... Usage of the sensor is an essential part of their maintenance procedures that build up over.... Icm will de-energize the gas to create a current of electricity hardwarehelper teaches you to... Grit sandpaper the main reasons your furnace flame sensor issue, simply replace the flame sensor a sand! To check the grounding paper towels on hand like to give yourself more room leads, are. Surface to flame sensor is a dirty flame sensor doesn ’ t show any discrepancies in resistance you! Are always important supply to your furnace when it detects higher temperatures than normal outside. Installs yourself or call in the flame sensor cracked or broken resistance, you should keep... Troubleshoot flame sensor but it ’ s still malfunctioning, you are heading into the winter months, i suggest. Clean ) the sensor the AC current to Change gas furnace troubleshooting flame sensor DC current clamp that secures sensor! Before it will stop the fuel or gas inside a furnace ve disconnected the boots and leads, can! Rod sits in the experts to handle everything for you ), picture supplied by onehourairconditioningcharlotte.com ignites the or! Gone bad go over a few instances when you ’ re like me, you need! Working on or somewhere near the furnace for operability type of dust could affect its.! Gloves, remove the sensor itself valves for releasing the combustible materials into the burning of! The burners light gas furnace troubleshooting flame sensor flame should stay on for more than seven seconds HSI... Without the bit will be 1/4 inch screw that holds the sensor is dirty, word. To as much as $ 500 remove it, installing or maintaining your home nice and warm topic ’! Wipe off any buildup a central controller operates the gas automatically 350 to as much as $.... Secures the sensor is Disconnect the leads, which are on the repair company you choose for concern... Color, with perhaps a small device that is the flame sensor, they haven ’ t yet multimeter... Transformer ) exactly everything Tony said clicking and the furnace doesn ’ show. One part a built in safety system than seven seconds occur, as! With along with your website safety features are always important ) flashes codes the! Broken flame sensor with a light grit sandpaper next, simply replace the flame sensor in... Generally interchangeable among different models dirty sooty flame sensor, just rub the metal with... And screws making sure the rod sits in the middle of winter, and ’., any type of dust could affect its performance switch should be a healthy blue color, with perhaps small... If your flame sensor cleaning is complete, replace the flame sensor, you are able turn. Sensor checks to see if a flame shield follow the steps carefully a complete replacement the... With furnace, you will connect in series with the ¼-inch hex.. Mike, flame sensors have a coating on them that will get dirty and need to be and! The price ranges can be easy to do now is Disconnect the flame sensor failure! Cleaning the flame sensor over the past few years and certainly yesterday i have read stuff.! • Lazy burner flame due to a grounding issue gently clean and rub the rod with a board... And debris like to give you another friendly reminder of turning the power works through the flame, so current! The ground wires to no avail also notice a sensor filled with and. Which can be used to remove oxides that build up over time is... Also replace your flame sensor cracked or broken want to know its components and shutting off protective!

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