The thermocouple detects the pilot light via sensors. Note that the electrical diagram says sensor but that is really a thermocouple (I guess it is under the white ceramic coating), Yes I do have an electronic gas control circuit but we are digressing here. Many HVAC techs will try to employ shady, scammy tactics to get the most money out of you. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. My question is about the pilot light, OK so based on your edit the pilot flame should stay on as long as the burners are on. I think that I shortly run that test a while ago and I did not hear the gas but I did hear some noise that was coming from the valve. If your furnace doesn’t stay on, check the pilot light. An unlit pilot light means that the burners can’t come on and the furnace won’t work. Step 4: Wait to see if the pilot light stays on. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If after a full minute, the flame goes out when you let go of the safety, the pilot may be dirty. If your furnace won’t kick on, check the pilot light. An older gas furnace has a standing pilot that stays on all the time — or at least, it's supposed to. I am stuck in transit in Malaysia from Australia. BanksPhotos / Getty Images The burner in your gas furnace is ignited either by an electronic ignition, found in most modern furnaces, or with a standing pilot flame, which is common in older style furnaces that have an annual fuel utilization efficiency (AFUE) rating of less than 80 percent. Aging furnace – In general, when a pilot light won’t stay lit, it’s a sign that the furnace is getting too old. During changing seasons the need for additional heat is not always predictable; leaving the pilot light on makes for quicker access to comfort. Sometimes the pilot flame is hard to see through the viewing window. Others have answered for pilot light. The "something red hot" in your furnace is apparently a "hot surface ignitor". It won't stay on. There is a safety issue as well. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. I will try it again over the weekend. Keep every intake air register in your home open and clear to avoid a “vacuum” effect in the inlet. Keep in mind, your furnace only uses a little bit of gas to power the pilot light. Ski holidays in France - January 2021 and Covid pandemic. Today we’re going to talk about some of the most common reasons that a gas furnace pilot light would go out and what you should do if it happens to you! A pilot light is a small flame that is kept lit to provide a catalyst for a much larger flame when it is called upon to do so. Please see the clarifications that I just added to the initial post. Some common causes include issues with the thermocouple and pilot tube. Pilot lights ignite the furnace and heat the air that circulates throughout the house. Turning the pilot light off will only add up to a few bucks of savings a month. This should light the furnace pilot light. A modern gas furnace usually has an electronic spark generator to ignite the gas when the thermostat calls for heat. You may need a professional to take a look and replace the malfunctioning part. A number of things can make an old furnace pilot light go out, including a strong draft, a faulty thermocouple or a loss of gas. When we used to use a Vulcan gas wall furnace we used to leave the pilot light on during winter and turn it off during summer. Gas fireplace - no spark for igniter - Martin DV5500 RVN, Gas fireplace flame won't stay on; both flame and pilot go out, Pilot won't stay lit after replacing thermocouple, Gas furnace control board issues: main burners never start; sparks never stop w/o flame sensor. This is the site I will always come to when I need a second opinion. Your furnace may not be getting enough gas to keep the pilot lit. A fierce, freezing draft sends shivers down your spine. The pilot light is a small flame … Most homeowners with natural gas furnaces have had the experience of learning that the pilot light on their furnace has gone out. Some common causes include issues with the thermocouple and pilot tube. The furnace stopped working at some point during the night. While I am not intimately familiar with this furnace nor the application of such an ignitor, I can safely presume that the control module senses the resistance of the ignitor and can tell this way whether the pilot light is lit or not. I originally stated that there did not appear to be a thermocouple on your furnace. However, you can reset it. If the pilot light does not light or does not stay lit, then replace the thermocouple. The pilot orifice may be full of dirt. Advertisement. But a common problem that people with furnaces run into is a pilot light that keeps going out. I have entered my answer below. The fix here is as easy as removing the thermocouple, cleaning it with a wire brush or something coarse (even an ordinary dollar bill works), and replacing. A pilot light needs the right amount of consistent oxygen to breathe and burn consistently. However, a malfunctioning thermocouple may lose the ability to sense heat from the pilot light, causing it to close the gas valve at random. It's often expected that any appliance that burns natural gas or propane will include a tiny flame that constantly burns and ignites the gas when the appliance's controls deliver fuel to the main burners. This can happen on excessively windy days or nights. Thanks for contributing an answer to Home Improvement Stack Exchange! Did the Allies try to "bribe" Franco to join them in World War II? Once the burn cycle is complete, both the burners and the pilot turn off. The pilot light in your gas furnace supplies heat to your home. The motor runs for 15 to 30 seconds, then the pilot light or direct spark system ignites the burner to heat the air. A pilot light going out can be inconvenient because it will completely cripple your furnace. The idea of a pilot light is how they overcame not needing an automatic ignition. If your pilot light re-lights easily after going out overnight, it’s possible it was blown out by a draft. To learn more, see our tips on writing great answers. If this is your first time turning on your furnace this season, keep in mind that it may take a little extra time for the pilot light … Why does this happen? Attempts to re-light the pilot light are futile. Yes, I believe that the glow must be present for the pilot to stay lit. Understanding how your gas furnace works will help you diagnose problems. Most homeowners with natural gas furnaces have had the experience of learning that the pilot light on their furnace has gone out. Even a slight residue can make the thermocouple malfunction. The furnace stopped working at some point during the night. Coleman presidential furnace not staying lit doityourself com coleman presidential furnace not staying lit doityourself com coleman mobile home pilot lighting procedure with set you pilot light won t stay lit how to replace a broken thermo couple. How to re-light a pilot light on a gas furnace. If the pilot light won’t stay lit, a bad thermocouple could be to blame. Ask around your neighborhood and find out if anyone else has had issues with their natural gas. The thermocouple isn't too difficult to find. Once you are sure the pilot light is on, release your pressure on the reset button. Some heaters had auto ignitions and therefore didn't need pilot lights. I am just wondering if, after the burners are lit, the pilot light should still stay on. Pilot lights are outdated technology, and if your furnace is more than 20 years old, a failing pilot light is usually an indication that you should have a new furnace—one that uses an electronic ignition system—installed in its place. There could be nothing wrong on your end. Hot Point Heating & Air Conditioning LLC. It is made by allowing a small amount of gas to come from the gas pipe through a small tube. If the furnace's burner does not light, first check that the thermostat is set to heat and turned to an appropriate temperature. A pilot light means heat, and it also means fuel usage. Luckily any pilot light, be it in a furnace or a water heater, is actually a fairly simple component. The gas may be the fuel, but the pilot flame is the ignition and one that won't re-light on its own. If you look very closely, you'll find the thermocouple tucked in behind the burners. Some heaters had auto ignitions and therefore didn't need pilot lights. 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