{"id":13857,"date":"2025-03-20T08:31:41","date_gmt":"2025-03-20T15:31:41","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=13857"},"modified":"2025-03-20T08:31:51","modified_gmt":"2025-03-20T15:31:51","slug":"how-to-test-and-replace-a-furnace-control-board","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/c\/how-to-test-and-replace-a-furnace-control-board\/","title":{"rendered":"How to test and replace a furnace control board"},"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-13880 avia-img-lazy-loading-not-13880 avia_image' src=\"https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-8.jpg\" alt='' title='' height=\"500\" width=\"1600\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-8.jpg 1600w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-8-300x94.jpg 300w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-8-1030x322.jpg 1030w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-8-768x240.jpg 768w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-8-1536x480.jpg 1536w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-8-1500x469.jpg 1500w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-1-8-705x220.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\">A bad furnace control board can cause all kinds of issues, including keeping your house from staying warm. The good news is that testing and replacing a furnace control board is something you can do yourself with a few simple tools. We\u2019ll show you how to diagnose a faulty control board to get your furnace running smoothly again.<\/span><\/p>\n<p><em><span style=\"font-weight: 400\">This article provides general guidance and may not correspond precisely to your specific appliance model. While we strive to offer practical tips for a range of DIY appliance repairs, variations in model designs and configurations can result in differing troubleshooting steps, error codes, or replacement parts. For the most accurate information, please refer to the technical sheet or user manual specific to your appliance.<\/span><\/em><\/p>\n\n<h2><span style=\"font-weight: 400\">Safety precautions<\/span><\/h2>\n<p><span style=\"font-weight: 400\">When working on any appliance, remember to keep safety first. Here are some tips to keep in mind:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Always power off and unplug your appliance or switch off the circuit breaker before attempting any maintenance or replacement work. This keeps you safe by preventing any risk of injury from electric shock.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Take your time and don\u2019t rush while working to prevent accidents and personal injuries.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Work in a well-lit area so you can clearly see and access the interior parts.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Never work on internal parts with bare wet hands. Make sure the work area is completely dry.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Check your user manual to see if there are specific installation or safety instructions for your part or appliance.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">If the appliance has recently been used, give it plenty of time for any heating parts to cool down before working on it.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Take pictures or make a note of wiring terminals or other connections before disconnecting to prevent any problems with reassembly.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">Signs you need to replace the control board<\/span><\/h2>\n<p><span style=\"font-weight: 400\">A faulty control board can cause a variety of issues with your furnace. Identifying the problem early can help prevent a complete system failure. Here are the common signs that your furnace control board might need replacing:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><b>Not starting<\/b><span style=\"font-weight: 400\">: If the furnace is receiving power but doesn\u2019t turn on, it could be a sign that the control board is malfunctioning and not sending the right signals to the furnace\u2019s components.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Erratic behavior<\/b><span style=\"font-weight: 400\">: Turning on and off randomly, or going through its heating cycle erratically, could indicate a problem with the control board\u2019s communication with other parts like the blower motor or ignition system.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Blower motor issues<\/b><span style=\"font-weight: 400\">: The blower motor may run continuously or not turn on at all if the control board is not sending the correct signals.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Error codes or flashing lights<\/b><span style=\"font-weight: 400\">: Many modern furnaces display error codes or flashing lights when there\u2019s an issue with the control board. These codes can help pinpoint the problem. Refer to your furnace&#8217;s manual for specific error code meanings.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Failure to ignite (gas furnaces)<\/b><span style=\"font-weight: 400\">: If the furnace is a gas model and fails to ignite or produce heat, the control board might not be sending the proper signals to the ignition system or gas valve.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">If you notice any of these symptoms, the control board could be the cause, and it&#8217;s time to test and potentially replace it.<\/span><\/p>\n<h2><span style=\"font-weight: 400\">Tools and materials you may need<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Before diving into the repair, make sure you have all the necessary tools and materials to complete the job safely and effectively. Here\u2019s what you may need:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">A Phillips or flat-head screwdriver (depending on your furnace)\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Multimeter\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Replacement control board. Make sure you purchase a replacement control board that matches the model of your furnace. You can find compatible parts on AppliancePartsPros.com. Double-check the part number and specifications to ensure it fits.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Camera or notebook to document how the wires are connected to the old control board.\u00a0\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Flashlight<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">How to test the control board<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Before replacing the control board, it\u2019s important to test it to confirm that it\u2019s faulty. In many cases, other electrical components may be causing the issue. Here\u2019s how to test the furnace control board with a multimeter:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The control board is usually housed within a compartment inside the furnace, and it\u2019s often near the blower motor or burner assembly.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Depending on your furnace model, you may need to use a screwdriver to remove the access panel. The panel is typically secured with screws or clips.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Once removed, you should have access to the inner components of the furnace.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">In a gas furnace, the control board is typically located near the burner assembly or beside the gas valve. It may be mounted directly onto the metal frame of the furnace.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">For electric furnaces, the control board is usually found near the blower motor, controlling the fan and the heating elements.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The control board will often look like a rectangular circuit board with various wires and connectors attached to it. It might have a series of diagnostic lights or error codes visible on the board.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Set your multimeter to measure AC voltage (for most furnace control boards). If you&#8217;re testing for continuity, switch it to continuity mode (the multimeter will beep when there\u2019s continuity).<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Place the multimeter probes on the terminals that are connected to the power supply.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Check the voltage reading on your multimeter. You should see a reading close to the furnace\u2019s rated voltage (usually 120V for most systems).<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">If there\u2019s no voltage or a very low reading, the control board may not be receiving power and could be faulty.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Visually check the control board for signs of burning, corrosion, or other damage. Sometimes, physical damage to the board is enough to identify the issue.<\/span><\/li>\n<\/ol>\n<h2><span style=\"font-weight: 400\">Replacement steps<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Now that you&#8217;ve confirmed the control board is faulty or needs replacing, it\u2019s time to remove the old board. Here\u2019s how to safely do it:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Before disconnecting anything, take a photo of the wiring or make a note of how the wires are connected to the control board.\u00a0\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Using pliers or a wrench, carefully disconnect the wires attached to the control board terminals. Be gentle, as the terminals may be fragile. If the wires are difficult to remove, make sure you\u2019re not pulling on them too hard.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The control board will likely be held in place by screws or clips. Use a screwdriver to remove these fasteners. Be sure to keep track of the screws in case you need them for the new control board.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Once the wires are disconnected and the screws are removed, carefully lift the old control board out of the furnace. Be mindful of any other parts around the board, and ensure you don\u2019t damage any surrounding parts.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Place the new control board in the same position as the old one. Ensure that the mounting holes line up with the ones on the furnace frame.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Use the screws you removed earlier to secure the new control board in place. Tighten the screws, but don\u2019t over-tighten, as this could damage the board or the mounting holes.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Refer to the photo or notes you took earlier to reconnect the wires to the correct terminals on the new control board. Double-check the connections to make sure they are secure and correctly placed.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Once the board is securely installed and all wires are connected, do a quick visual inspection. Make sure there are no loose connections, exposed wires, or other potential issues.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Carefully align and replace the furnace access panel that you removed earlier. Secure it with screws or clips to make sure it\u2019s properly sealed.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Flip the power switch back to the &#8220;On&#8221; position, or reset the circuit breaker to restore power to the furnace.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Adjust the thermostat to a higher temperature to trigger the furnace to start up. This should prompt the system to go through its heating cycle, starting with the ignition (for gas furnaces) or heating elements (for electric furnaces).<\/span><\/li>\n<\/ol>\n<h2><span style=\"font-weight: 400\">Need more help?<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Thanks for reading! If you\u2019re searching for replacement parts, grab your model number and visit <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400\">. We have over two million parts in stock, and most ship quickly, arriving in just two business days. Need assistance? Call our team anytime at 1 (877) 477-7278.<\/span><\/p>\n<p><span style=\"font-weight: 400\">In the meantime, take a look at our <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/\"><b>DIY blog<\/b><\/a><span style=\"font-weight: 400\"> or watch our extensive library of video tutorials on <\/span><a href=\"https:\/\/www.youtube.com\/@appliancepartspros\/videos\"><b>our YouTube channel<\/b><\/a><span style=\"font-weight: 400\">.<\/span><\/p>\n<p><span style=\"font-weight: 400\">For even more repair tips, follow us on <\/span><a href=\"http:\/\/facebook.com\/appliancepartspros\"><b>Facebook<\/b><\/a><span style=\"font-weight: 400\">, <\/span><a href=\"https:\/\/twitter.com\/applpartspros\"><b>Twitter<\/b><\/a><span style=\"font-weight: 400\">, and <\/span><a href=\"https:\/\/instagram.com\/appliancepartspros?igshid=OGQ5ZDc2ODk2ZA==\"><b>Instagram<\/b><\/a><span style=\"font-weight: 400\">!<\/span><\/p>\n<p><b>Read more:<\/b><\/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<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<\/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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