{"id":13848,"date":"2025-03-20T08:18:59","date_gmt":"2025-03-20T15:18:59","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=13848"},"modified":"2025-03-20T08:19:07","modified_gmt":"2025-03-20T15:19:07","slug":"how-to-check-and-replace-a-cracked-furnace-heat-exchanger","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/c\/how-to-check-and-replace-a-cracked-furnace-heat-exchanger\/","title":{"rendered":"How to check and replace a cracked furnace heat exchanger"},"content":{"rendered":"<div  class='avia-image-container  av-styling-    avia-builder-el-0  el_before_av_textblock  avia-builder-el-first  avia-align-center '  itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\"  ><div class='avia-image-container-inner'><div class='avia-image-overlay-wrap'><img fetchpriority=\"high\" fetchpriority=\"high\" decoding=\"async\" class='wp-image-13889 avia-img-lazy-loading-not-13889 avia_image' src=\"https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-32.jpg\" alt='' title='' height=\"500\" width=\"1600\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-32.jpg 1600w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-32-300x94.jpg 300w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-32-1030x322.jpg 1030w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-32-768x240.jpg 768w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-32-1536x480.jpg 1536w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-32-1500x469.jpg 1500w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-32-705x220.jpg 705w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/><\/div><\/div><\/div>\n<section class=\"av_textblock_section \"  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock  '   itemprop=\"text\" ><p><span style=\"font-weight: 400\">With winter looming, a faulty furnace is probably the last thing on your wish list. A cracked heat exchanger isn&#8217;t just a minor glitch in your heating system\u2014it&#8217;s a serious concern that could impact the safety and coziness of your home. Spotting the warning signs and knowing how to handle them can be crucial for keeping your family safe and snug.<\/span><\/p>\n<p><em><span style=\"font-weight: 400\">The tips in this article might not fit your exact appliance model. We aim to help with all sorts of DIY appliance fixes, but different models and setups can mean different troubleshooting steps, error codes, parts, and so on. For the best advice, it&#8217;s a good idea to check the manufacturer&#8217;s documentation for your specific appliance, or feel free to <\/span><a href=\"https:\/\/www.appliancepartspros.com\/repair-help\/\"><span style=\"font-weight: 400\">reach out to us<\/span><\/a><span style=\"font-weight: 400\"> if you&#8217;ve got questions.<\/span><\/em><\/p>\n\n<h2><span style=\"font-weight: 400\">Understand your furnace&#8217;s heat exchanger<\/span><\/h2>\n<p><span style=\"font-weight: 400\">The heat exchanger is kinda like the beating heart of your furnace. It moves heat from the combustion gases over to the air that keeps your place cozy. It also makes sure those gases stay sealed off from the air you&#8217;re breathing, keeping things safe and running smoothly. Getting a grasp on how it functions can help you notice when something&#8217;s off.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">Warning signs of a cracked heat exchanger<\/span><\/h2>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">You can see damage. One of the easiest ways to spot a cracked heat exchanger is just by taking a look. If you&#8217;re okay with getting into your furnace (just be sure it&#8217;s switched off and cooled down first), check for any cracks or rust on the heat exchanger. The constant heating up and cooling down makes the metal expand and contract, which can cause cracks as time goes by.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Soot&#8217;s showing up. If you notice soot inside your furnace or around the heat exchanger, that&#8217;s definitely a red flag. Soot means the fuel isn&#8217;t burning completely, often because of a bad air-fuel mix or clogged burners. A cracked heat exchanger might not be the direct cause of soot, but finding soot could point to other issues that need fixing. Plus, it can make your furnace less efficient and might even be dangerous.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Flame acts weird. Have a look at the furnace flame. Normally, it should be steady and blue. If you see it&#8217;s yellow or flickering, that could mean the combustion isn&#8217;t right\u2014maybe not enough oxygen or a messed-up air-fuel mix. A cracked heat exchanger doesn&#8217;t usually mess with the flame directly, but any weird flame behavior means it&#8217;s time to call in a pro. Don&#8217;t brush this sign off.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Funky smells. Is there a strong, nasty smell, kinda like formaldehyde, when your furnace is running? That could be gases leaking out from a cracked heat exchanger. These fumes can give you headaches and make you feel sick, so you need to deal with this ASAP.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Everyone&#8217;s feeling off. If people in your home are getting headaches, feeling nauseous, dizzy, or just plain exhausted for no good reason, it could be from carbon monoxide leaking due to a cracked heat exchanger. Carbon monoxide doesn&#8217;t have any smell or color, so these symptoms might be the only hint you&#8217;ve got.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Water&#8217;s gathering. Noticing water puddling up around the bottom of your furnace? Sure, some furnaces produce condensation (especially the high-efficiency ones), but if you&#8217;ve got moisture that doesn&#8217;t make sense, it might mean there&#8217;s a crack in the heat exchanger letting water vapor leak out.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Hearing strange noises. Banging, popping, or whistling sounds coming from your furnace? That&#8217;s not normal. These noises might happen because cracks are making parts of the heat exchanger expand or contract in weird ways.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Bills are climbing. If your heating bills have suddenly shot up but you haven&#8217;t changed how much you&#8217;re using the furnace, it might be because your furnace is overworking to heat your place. A cracked heat exchanger can make it less efficient.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Finding dust or soot around vents. Seeing a lot of dust or soot building up near your furnace vents? That might be stuff escaping through a crack and getting spread around your house.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Bad smells coming from the furnace. A cracked heat exchanger might make your furnace give off nasty odors. Trust your nose\u2014if something smells weird, it&#8217;s time to check it out.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">What to do if you notice these signs<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Spotting any of these signs can be pretty scary, but taking action fast can help keep your home safe.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">First things first, turn off your furnace. This stops any more harmful gases from circulating. Find the power switch or the circuit breaker for your furnace and flip it off.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Clogged filters or blocked vents can make furnace problems worse. Look at your furnace filter and swap it out if it&#8217;s dirty. Make sure all vents and returns are open and not blocked.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Even if the heat exchanger might be the issue, other parts can cause similar signs. Check for loose connections, damaged ducts, or other visible problems you can fix safely.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">If you don&#8217;t have them yet, put carbon monoxide detectors on every floor of your house. They&#8217;ll give you an extra line of defense and warn you about dangerous gas levels.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Write down the signs you&#8217;ve spotted. Snap pictures of any damage you see and jot down notes about weird smells or noises. It really helps to know your furnace&#8217;s model number. If you&#8217;re not sure where to find it, take a look at our guide on <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-find-your-appliances-model-number\/\"><span style=\"font-weight: 400\">how to find your appliance&#8217;s model number<\/span><\/a><span style=\"font-weight: 400\">.<\/span><\/li>\n<\/ol>\n<h2><span style=\"font-weight: 400\">Stay safe and warm<\/span><\/h2>\n<p><span style=\"font-weight: 400\">For parts, resources, and expert advice, swing by AppliancePartsPros.com. Stay in touch 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 the latest tips and updates.<\/span><\/p>\n<p><span style=\"font-weight: 400\">If you have questions or need more help, don&#8217;t hesitate to get in touch with our team. Keeping you comfortable and safe is what we do.<\/span><\/p>\n<p><b>Read more: <\/b><\/p>\n<p><a href=\"https:\/\/www.appliancepartspros.com\/b\/space-heater-safety-and-you\/\"><b>12 things you should know about portable space heaters<\/b><\/a><\/p>\n<p><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><\/p>\n<p><a href=\"https:\/\/www.appliancepartspros.com\/b\/your-guide-to-choosing-a-space-heater\/\"><b>Your guide to choosing a space heater<\/b><\/a><\/p>\n<\/div><\/section>\n<div  class='av-social-sharing-box  avia-builder-el-2  el_after_av_textblock  avia-builder-el-last  '><div class='av-share-box'><h5 class='av-share-link-description av-no-toc '>Share this entry<\/h5><ul class='av-share-box-list noLightbox'><li class='av-share-link av-social-link-facebook' ><a target=\"_blank\" aria-label=\"Share on Facebook\" 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