{"id":17368,"date":"2025-05-12T06:50:10","date_gmt":"2025-05-12T13:50:10","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=17368"},"modified":"2026-07-14T11:55:38","modified_gmt":"2026-07-14T18:55:38","slug":"how-to-replace-the-defrost-control-board-on-a-whirlpool-refrigerator","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/how-to-replace-the-defrost-control-board-on-a-whirlpool-refrigerator\/","title":{"rendered":"How to replace the defrost control board 4388931 on a Whirlpool refrigerator"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Learn how to replace the 4388931 defrost control board in your Whirlpool refrigerator. A simple fix to stop frost issues and restore cooling!<\/p>\n","protected":false},"author":3,"featured_media":17574,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_aviaLayoutBuilderCleanData":"[av_textblock size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' color='' id='' custom_class='' av_uid='av-mea4qrue' admin_preview_bg='']\r\n<span data-sheets-root=\"1\">Does your Whirlpool refrigerator have a mind of its own, leaving your food freezing or thawing unexpectedly? The culprit could be a faulty defrost control board, but no worries\u2014we've got you covered! With our step-by-step guide and helpful how-to video just below, you can swap out the faulty part yourself and restore your refrigerator's performance in no time.<\/span>\r\n[\/av_textblock]\r\n\r\n[av_video src='https:\/\/www.youtube.com\/watch?v=FfR0NlOQwVk' mobile_image='' attachment='' attachment_size='' format='16-9' width='16' height='9' conditional_play='' id='' custom_class='' av_uid='av-mea4rhrk']\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-me8n7mj3' admin_preview_bg='']\r\n<b>Looking for the right part?<\/b><span style=\"font-weight: 400;\"> Enter your appliance model number below to find the exact match and get your appliance running like new again!<\/span>\r\n\r\n<span style=\"font-weight: 400;\">[search]<\/span>\r\n[\/av_textblock]\r\n\r\n[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/05\/20250429_1424_Refrigerator-Focused-Kitchen_simple_compose_01jt1cmy0fftw980esmhxv8mcg-1500x630.png' attachment='17574' attachment_size='featured_large' 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-mah6rqhz' 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-mae835sa' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">On a Whirlpool refrigerator, the defrost control board (part number 4388931) is responsible for regulating the defrost cycle of the refrigerator, allowing your refrigerator to maintain the correct temperature. Common signs that indicate the need for replacement include the refrigerator not running at all, a buildup of frost in the freezer, or inconsistent cooling. Fortunately, with a few basic tools and some patience, you can tackle this repair yourself and get your refrigerator back in working order. So, let's get started!<\/span>\r\n\r\n<span style=\"font-weight: 400;\">If you need any replacement parts for your appliance, you can enter your <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-find-your-appliances-model-number\/\"><span style=\"font-weight: 400;\">model number<\/span><\/a><span style=\"font-weight: 400;\"> at <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><span style=\"font-weight: 400;\">AppliancePartsPros.com<\/span><\/a><span style=\"font-weight: 400;\"> to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.<\/span>\r\n\r\n<em><span style=\"font-weight: 400;\">The information in this article may not apply to your specific appliance model. We recommend consulting your manufacturer's documentation or<\/span><a href=\"https:\/\/www.appliancepartspros.com\/repair-help\/\"> <b>contact us<\/b><\/a><span style=\"font-weight: 400;\"> with any questions.<\/span><\/em>\r\n\r\n[lwptoc numeration=\"none\"]\r\n\r\n<b>Watch here: <\/b><a href=\"https:\/\/www.youtube.com\/watch?v=FfR0NlOQwVk\"><b>How To: Whirlpool\/KitchenAid\/Maytag Refrigerator Defrost Control Board 4388931<\/b><\/a>\r\n<p style=\"font-size:14.5px;margin:14px 0;font-family:system-ui,-apple-system,sans-serif\"><a href=\"#app-safety-notes\">Full safety notes below<\/a><\/p>\n\n<h2><span style=\"font-weight: 400;\">Safety precautions<\/span><\/h2>\r\n<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>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><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>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take your time and don\u2019t rush while working to prevent accidents and personal injuries.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Work in a well-lit area so you can clearly see and access the interior parts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Never work on internal parts with bare wet hands. Make sure the work area is completely dry.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><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>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury.\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><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>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><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>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><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>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">Tools and materials needed<\/span><\/h2>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/www.appliancepartspros.com\/whirlpool-timer-defrost-4388931-ap3109393.html\"><span style=\"font-weight: 400;\">Replacement part<\/span><\/a><span style=\"font-weight: 400;\"> (make sure it's compatible with your model before installing)<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">1\/4\" nutdriver<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Phillips screwdriver<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flathead screwdriver<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">Replacement steps<\/span><\/h2>\r\n<h3><span style=\"font-weight: 400;\">Step 1: Disassembly and removal<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Open the fresh food door of the refrigerator.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unplug the refrigerator to ensure safety during the repair.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the cover box that protects the thermostat.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This cover is secured with a quarter-inch screw. Use a quarter-inch nut driver to remove the screw.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once the screw is removed, gently drop down the cover and pull it slightly forward to disengage it from the locking tabs at the back.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the plug at the back of the cover. It may be difficult to see.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use a flathead screwdriver to gently pry the plug out. Insert the screwdriver into the easy tab and carefully pull it down.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Identify the three clips holding the sensor bulb in place.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use the flathead screwdriver to pry the sensor bulb out from these clips. Insert the screwdriver behind each clip gently and lift until the bulb is free.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Disconnect the plugs from the old control board using the flathead screwdriver. Pry them off gently.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">There should be two Phillips screws securing the control board. Use a Phillips screwdriver to remove these screws.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once the screws are out, turn the assembly over to access the control board.<\/span><\/li>\r\n<\/ol>\r\n<h3><span style=\"font-weight: 400;\">Step 2: Installation and reassembly<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the new board includes an adapter plug for different configurations, check if it is needed. In this case, you can discard the adapter if it\u2019s not necessary.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Begin by plugging in the two plugs to the new control board.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Position the control board, ensuring it aligns with the holes.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insert the Phillips screws into their corresponding holes and tighten them securely.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take the assembly back to the refrigerator.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Start by placing the sensor bulb back into the clips at the back, ensuring it locks in securely.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Align the assembly and ensure that the locking tab is correctly positioned at the back. Press it in until it clicks into place.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Place the tube into the cutout and ensure that the rear tabs lock properly into place.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bring the assembly up and secure it with the quarter-inch screw using the quarter-inch nut driver. Tighten it completely.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Close the fresh food door of the refrigerator.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Plug the refrigerator back into the power source.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check to ensure that the refrigerator is cooling properly.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">Additional information<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Thanks for reading! We hope this guide helped you replace the defrost control board on your Whirlpool refrigerator.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">If you still need some replacement parts, grab your model number and head over to <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\">. We offer over two million parts and most orders arrive in two business days. If you need some help with finding the right part or placing an order, you can contact our team at 1 (877) 477-7278.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">While you\u2019re waiting for your new part to arrive, you can explore our <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/\"><b>DIY blog<\/b><\/a><span style=\"font-weight: 400;\"> and watch thousands 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>\r\n\r\n<span style=\"font-weight: 400;\">Be sure to 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;\"> to see our latest repair guides!<\/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:#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_blog blog_type='posts' categories='11' link='category' blog_style='blog-grid' content_length='content' contents='title_read_more' date_filter='' date_filter_start='' date_filter_end='' date_filter_format='yy\/mm\/dd' offset='0' conditional='' bloglist_width='' columns='3' preview_mode='auto' image_size='portfolio' items='3' paginate='yes' lazy_loading='disabled' alb_description='' id='' custom_class='' av_uid='av-mah6qd68']\r\n\r\n[av_social_share title='Share this entry' buttons='' share_facebook='' share_twitter='' share_whatsapp='' share_pinterest='' share_reddit='' share_linkedin='' share_tumblr='' share_vk='' share_mail='' share_yelp='' yelp_link='https:\/\/www.yelp.com' style='' av-desktop-hide='' av-medium-hide='' av-small-hide='' av-mini-hide='' alb_description='' id='' custom_class='' av_uid='av-uiap14']\r\n\r\n","_aviaLayoutBuilder_active":"active","footnotes":""},"categories":[84,11],"tags":[9104,9113,9109,9105,9112,9107,9108,9111,9110,9106],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>How to replace the defrost control board 4388931 on a Whirlpool refrigerator<\/title>\r\n<meta name=\"description\" content=\"Learn how to replace the 4388931 defrost control board in your Whirlpool refrigerator. 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