{"id":13715,"date":"2025-03-18T07:51:15","date_gmt":"2025-03-18T14:51:15","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=13715"},"modified":"2026-07-14T10:48:53","modified_gmt":"2026-07-14T17:48:53","slug":"how-to-clean-and-replace-a-furnace-flame-sensor","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/how-to-clean-and-replace-a-furnace-flame-sensor\/","title":{"rendered":"How to clean and replace a furnace flame sensor"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Learn how to clean and replace your furnace flame sensor with easy-to-follow steps to keep your furnace running smoothly and efficiently.<\/p>\n","protected":false},"author":3,"featured_media":13769,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_aviaLayoutBuilderCleanData":"[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-6.jpg' attachment='13768' attachment_size='full' copyright='' caption='' styling='' align='center' font_size='' overlay_opacity='0.4' overlay_color='#000000' overlay_text_color='#ffffff' animation='no-animation' hover='' appearance='' link='' target='' title_attr='' alt_attr='' lazy_loading='disabled' id='' custom_class='' av_element_hidden_in_editor='0' av_uid='av-18mdxv7' admin_preview_bg=''][\/av_image]\r\n\r\n[av_textblock size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' color='' id='' custom_class='' av_uid='av-m5qsizie' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">If your furnace is acting up and you\u2019re having trouble keeping it running smoothly, a dirty or faulty flame sensor could be the culprit. The flame sensor is a key part of your furnace\u2019s safety system, ensuring that the gas valve stays off if no flame is detected. The good news? Cleaning or replacing it is a fairly simple DIY task that can get your furnace back in action. We\u2019ll walk you through the steps to clean or replace your furnace flame sensor, so your heating system can keep you warm all season long. Let\u2019s get started!<\/span>\r\n\r\n<em><span style=\"font-weight: 400;\">The info in this article might not cover every appliance model. While we aim to provide helpful advice for all sorts of DIY appliance repairs, different models and setups can mean different troubleshooting steps, error codes, part swaps, etc. For the most accurate guidance, we recommend checking the manufacturer's documentation for your specific model or reaching out to us if you've got questions.<\/span><\/em>\r\n\r\n[lwptoc numeration=\"none\"]\r\n<div style=\"border-left:4px solid #E89805;background:#FFF8EC;padding:9px 14px;margin:14px 0;font-size:14.5px;line-height:1.5;color:#1A1A1A;font-family:system-ui,-apple-system,sans-serif\">\u26a0\ufe0f <b>Smell gas?<\/b> Stop \u2014 get outside, then call your gas utility (or 911) from there. <a href=\"#app-safety-notes\">Full safety notes below<\/a>.<\/div>\n\n<h2><span style=\"font-weight: 400;\">What is a furnace flame sensor?<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">The flame sensor in your furnace plays an important role in safety and proper operation. It detects whether the furnace burners have ignited by sensing the flame. If the sensor doesn't detect a flame, it shuts off the gas supply to prevent a dangerous buildup. Over time, the flame sensor can become dirty or damaged, causing the furnace to malfunction\u2014either shutting off too soon or not starting at all.<\/span>\r\n\r\n<b>What to look for:<\/b>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The furnace starts but shuts off after a few seconds? This could be a sign that the flame sensor isn\u2019t detecting the flame properly.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The furnace cycles on and off frequently? A faulty or dirty flame sensor might be the culprit.<\/span><\/li>\r\n<\/ul>\r\n<b>Read more: <\/b><a href=\"https:\/\/www.appliancepartspros.com\/b\/space-heater-safety-and-you\/\"><b>12 things you should know about portable space heaters<\/b><\/a>\r\n<h2><span style=\"font-weight: 400;\">Signs your flame sensor needs cleaning or replacement<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Before jumping into cleaning or replacing the flame sensor, it's important to know when it's necessary. A faulty flame sensor can cause a variety of furnace issues, including poor heating and constant cycling.<\/span>\r\n\r\n<b>What to look for:<\/b>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Frequent furnace shutdowns<\/b><span style=\"font-weight: 400;\">: If the furnace ignites but shuts off after a few seconds or minutes, this is often a sign that the flame sensor is dirty or malfunctioning. The sensor isn\u2019t detecting the flame properly and is shutting off the gas to prevent a potential hazard.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>The furnace tries to ignite but doesn't stay on<\/b><span style=\"font-weight: 400;\">: If your furnace repeatedly tries to ignite and then turns off without staying on, it's usually due to the flame sensor not detecting the flame.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Short cycling<\/b><span style=\"font-weight: 400;\">: Your furnace starts up and runs for a short period before turning off again, only to repeat the process. This cycle can happen several times and can be frustrating.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Excessive gas smell<\/b><span style=\"font-weight: 400;\">: If you smell gas after the furnace tries to ignite but doesn't stay on, it could be an indication that the gas valve is shutting off because the flame sensor isn't doing its job.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">Safety precautions before you get started<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Safety comes first when working on any appliance. Here are some practical tips to help keep you safe:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Always turn off the power by unplugging the appliance or switching off the circuit breaker before starting. This protects you from the risk of electric shock.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wear insulated gloves to protect your hands from sharp edges, pinching hazards, or debris.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take your time and work at a steady pace to avoid accidents or injuries.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Make sure your workspace is well-lit so you can clearly see and access the parts you\u2019re working on.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Keep your area organized and free of clutter, and ensure children and pets are kept away from the workspace.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Never handle internal parts with wet hands. Make sure both your hands and the work area are completely dry.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check your appliance\u2019s user manual for specific instructions or safety guidelines related to your repair.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Handle parts gently to prevent damaging the appliance or injuring yourself by using too much force.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wear safety glasses if you\u2019re dealing with chemicals, dust, or large debris to protect your eyes.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the appliance was recently used, give it time to cool down before working on any heated components.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take photos or notes of wiring connections before disconnecting anything. This makes reassembly much easier.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Avoid touching exposed wires or terminals. If you need to handle wires, use non-conductive tools or wear insulated gloves to reduce the risk of electrical shock.<\/span><\/li>\r\n<\/ul>\r\n<b>Read more: <\/b><a href=\"https:\/\/www.appliancepartspros.com\/b\/your-guide-to-choosing-a-space-heater\/\"><b>Your guide to choosing a space heater<\/b><\/a>\r\n<h2><span style=\"font-weight: 400;\">How to clean your furnace flame sensor<\/span><\/h2>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">For safety, always turn off the furnace and disconnect the power supply before working on any parts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The flame sensor is typically located near the furnace burners. It\u2019s usually a small metal rod with one or two wires connected to it. If you\u2019re not sure where it is, check your furnace manual for its location.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use a screwdriver to remove any screws or fasteners securing the sensor. Once the screws are removed, carefully pull the sensor out of its mounting bracket.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use a soft cloth or a fine wire brush to gently clean any dirt or buildup from the flame sensor. Be careful not to damage the sensor.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After cleaning, inspect the sensor for any signs of wear, such as cracks or corrosion. If it looks damaged, it may be time to replace it.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once the sensor is clean, carefully reinstall it in the same position. Make sure it is securely fastened with the screws or fasteners.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After reinstalling the sensor, reconnect the power and turn the furnace back on. If the furnace operates normally and the blower shuts off when it should, the cleaning was successful.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">How to replace a furnace flame sensor<\/span><\/h2>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn off the furnace and disconnect the power. Always ensure the furnace is off before working on any parts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the flame sensor. Find the flame sensor near the burners (refer to your manual for location details).<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remove the old sensor. Unscrew the sensor and disconnect the wiring.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Install the new sensor. Attach the wires to the new sensor and secure it with screws.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Test the new sensor. Reconnect the power, turn on the furnace, and check if it cycles properly. The blower should stop when the desired temperature is reached.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Monitor the furnace. Keep an eye on the furnace to ensure the new sensor is working well.<\/span><\/li>\r\n<\/ol>\r\n<b>Read more: <\/b><a href=\"https:\/\/www.appliancepartspros.com\/b\/winter-safety-tips-for-space-heaters\/\"><b>12 simple space heater safety tips for this winter<\/b><\/a>\r\n<h2><span style=\"font-weight: 400;\">Keep your furnace running\u00a0<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Taking care of your furnace's flame sensor is a simple task that can save you time and money. By keeping it clean or replacing it when needed, you're making sure your furnace operates safely and efficiently. Remember, we're here to help with any appliance repair needs you might have. Visit <\/span><a href=\"https:\/\/www.appliancepartspros.com\"><span style=\"font-weight: 400;\">AppliancePartsPros.com<\/span><\/a><span style=\"font-weight: 400;\"> for quality parts and expert advice.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Connect with us on <\/span><a href=\"https:\/\/www.facebook.com\/appliancepartspros\"><span style=\"font-weight: 400;\">Facebook<\/span><\/a><span style=\"font-weight: 400;\"> and <\/span><a href=\"https:\/\/twitter.com\/applpartspros\"><span style=\"font-weight: 400;\">Twitter<\/span><\/a><span style=\"font-weight: 400;\"> for more handy tips and updates. If you've got questions or need a hand, don't hesitate to reach out. We're always ready to help you keep your appliances running smoothly.<\/span>\n\n<div id=\"app-safety-notes\" style=\"border:1px solid #E6E6E6;border-radius:8px;overflow:hidden;margin:22px 0;font-family:system-ui,-apple-system,sans-serif\"><div style=\"background:#E89805;color:#fff;padding:9px 16px;font-weight:700;font-size:15px\">\ud83d\udd25&nbsp;Gas safety \u2014 before you start<\/div><ul style=\"margin:0;padding:14px 20px 14px 38px;font-size:15px;line-height:1.6;color:#1A1A1A;background:#fff\"><li style=\"margin:6px 0\"><b>Shut off the gas supply<\/b> before you start.<\/li><li style=\"margin:6px 0\">Follow your <b>local codes<\/b>.<\/li><li style=\"margin:6px 0\">Keep a <b>working carbon monoxide detector<\/b> nearby.<\/li><li style=\"margin:6px 0\">A <b>yellow or flickering flame<\/b> means incomplete combustion \u2014 fix it, don't ignore it.<\/li><li style=\"margin:6px 0\">If you smell a <b>strong, persistent gas odor<\/b>: get everyone outside, don't touch any switches or create a spark, and <b>call your gas utility or 911 from outside<\/b>.<\/li><\/ul><\/div>\n\n<div style=\"border:1px solid #E6E6E6;border-radius:8px;overflow:hidden;margin:22px 0;font-family:system-ui,-apple-system,sans-serif\"><div style=\"background:#1C437C;color:#fff;padding:9px 16px;font-weight:700;font-size:15px\">\u26a1&nbsp;Electrical safety \u2014 before you start<\/div><ul style=\"margin:0;padding:14px 20px 14px 38px;font-size:15px;line-height:1.6;color:#1A1A1A;background:#fff\"><li style=\"margin:6px 0\"><b>Disconnect power<\/b> before you start \u2014 unplug it or switch off the breaker, and <b>confirm it's dead<\/b>.<\/li><li style=\"margin:6px 0\">Follow your <b>local electrical code<\/b>.<\/li><li style=\"margin:6px 0\">Anything involving <b>household wiring, outlets, or the breaker panel<\/b> itself is <b>licensed-electrician territory<\/b>.<\/li><\/ul><\/div>\n[\/av_textblock]\r\n\r\n[av_social_share title='Share this entry' buttons='' share_facebook='' share_twitter='' 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