{"id":15348,"date":"2025-04-02T06:15:36","date_gmt":"2025-04-02T13:15:36","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=15348"},"modified":"2025-04-02T06:15:43","modified_gmt":"2025-04-02T13:15:43","slug":"7-reasons-why-your-window-air-conditioner-wont-start","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/c\/7-reasons-why-your-window-air-conditioner-wont-start\/","title":{"rendered":"7 reasons why your window air conditioner won\u2019t start"},"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-15416 avia-img-lazy-loading-not-15416 avia_image' src=\"https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/04\/Updated-blog-rectangle-1-1.jpg\" alt='' title='' height=\"500\" width=\"1600\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/04\/Updated-blog-rectangle-1-1.jpg 1600w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/04\/Updated-blog-rectangle-1-1-300x94.jpg 300w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/04\/Updated-blog-rectangle-1-1-1030x322.jpg 1030w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/04\/Updated-blog-rectangle-1-1-768x240.jpg 768w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/04\/Updated-blog-rectangle-1-1-1536x480.jpg 1536w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/04\/Updated-blog-rectangle-1-1-1500x469.jpg 1500w, https:\/\/www.appliancepartspros.com\/c\/wp-content\/uploads\/2025\/04\/Updated-blog-rectangle-1-1-705x220.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 the intensifying heat outside, a window AC may be an essential part of your home. But what do you do when it won\u2019t start? Thankfully, you don\u2019t need to call in a expensive technician. Let\u2019s walk through the troubleshooting steps so you can get your unit running smoothly.<\/span><\/p>\n<p><span style=\"font-weight: 400\">If you find out that you need any <\/span><a href=\"https:\/\/www.appliancepartspros.com\/air-conditioner-parts.html\"><b>replacement parts for your air conditioner<\/b><\/a> <span style=\"font-weight: 400\">while you\u2019re troubleshooting, you can enter your <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-find-your-appliances-model-number\/\"><b>model number<\/b><\/a><span style=\"font-weight: 400\"> at <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/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><\/p>\n<p><em><span style=\"font-weight: 400\">The troubleshooting information in this article is based on general service manuals and may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.<\/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 you attempt any maintenance or replacement work. This keeps you safe by eliminating any risk of electric shock.\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 to cool down before working on it.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Take your time while working to prevent accidents and personal injuries. <\/span><span style=\"font-weight: 400\">Rushing is the enemy of precision.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Work in a well-lit area so you can see and access appliance parts.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Keep your workspace free 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 wet hands. Make sure the work area is completely dry.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Check the user manual to see if there are specific installation or safety instructions related to your appliance or replacement part.\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 personal injury.<\/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 and debris.<\/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<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Always take photos or make a note of wiring terminals or other connections before disconnecting them to make reassembly easier.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Don\u2019t test live voltage with a multimeter if you\u2019re unfamiliar with how to prevent short-circuiting.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400\">Why your window AC isn\u2019t starting<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Check out these common reasons that can prevent a window air conditioner from running and how you can fix them yourself.<\/span><\/p>\n<h3><span style=\"font-weight: 400\">Reason #1: Problem with the incoming power<\/span><\/h3>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Check the circuit breaker and reset it if it\u2019s tripped.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Inspect the power cord for any breaks or damage. Replace it if it\u2019s damaged.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Reseat the power cord plug in the outlet. Make sure the connection is secure.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Set a multimeter to continuity mode.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Use the meter probes to test the power cord for continuity. The meter should make a beeping sound if there\u2019s continuity.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400\">If the cord doesn\u2019t have continuity or is damaged, replace it with a new one.<\/span><\/p>\n<h3><span style=\"font-weight: 400\">Reason #2: Faulty remote control<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Make sure the batteries in the remote control are new and installed correctly. If the remote isn\u2019t working, try using the controls on the unit&#8217;s touchpad.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Check that there\u2019s nothing blocking the line of sight between the remote and the air conditioner.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Replace the remote control if it\u2019s malfunctioning.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400\">Reason #3: Incorrect temperature setting<\/span><\/h3>\n<p><span style=\"font-weight: 400\">Check the temperature setting on the air conditioner. Lower the set temperature if it\u2019s higher than the current room temperature.<\/span><\/p>\n<h3><span style=\"font-weight: 400\">Reason #4: Bad switch or thermostat<\/span><\/h3>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Refer to the diagram for your specific model to access the switch or thermostat.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Inspect the switch or thermostat terminals and wiring for any damage. If you find any damage, replace as needed.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">If the unit has a switch, set a multimeter to continuity mode. If it has a thermostat, set the meter to resistance mode.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Use the multimeter probes to check the switch or thermostat, then compare the readings to the acceptable ones listed on the unit\u2019s technical sheet.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400\">If the switch or thermostat fails testing, replace them as needed.<\/span><\/p>\n<h3><span style=\"font-weight: 400\">Reason #5: Defective control panel or wiring<\/span><\/h3>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Refer to the model diagrams for your unit to access the control board and user interface.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Inspect all the wires and connections at the control panel. Look for any obvious signs of damage, such as burns or frays. Reconnect any loose wiring.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Inspect the control board for any burns or bulging.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400\">Replace the wiring and\/or control board if they\u2019re damaged.<\/span><\/p>\n<h3><span style=\"font-weight: 400\">Reason #6: Faulty capacitor or start-relay switch<\/span><\/h3>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Check the terminals on the capacitor and start-relay switch for any damage or corrosion.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Clean or replace the terminals as needed.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">If the terminals look OK, discharge the capacitor.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Set a multimeter to continuity mode and use the probes to test the capacitor and start-relay switch.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Replace the capacitor or start relay switch if either fails testing.<\/span><\/li>\n<\/ol>\n<h3><span style=\"font-weight: 400\">Reason #7: Bad compressor<\/span><\/h3>\n<ol>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Inspect the compressor terminals for any evidence of burns or corrosion. Clean or replace them as needed.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Check the motor circuits for continuity using a multimeter.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Contact a certified technician to repair or replace the compressor, as they will need to handle the refrigerant properly.<\/span><\/li>\n<\/ol>\n<h2><span style=\"font-weight: 400\">Additional information<\/span><\/h2>\n<p><span style=\"font-weight: 400\">Thank you for reading! We hope this guide helped you get your air conditioner working again.<\/span><\/p>\n<p><span style=\"font-weight: 400\">If you have any other appliance repair needs or projects, don\u2019t hesitate to explore our other troubleshooting guides and videos.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400\">If you need replacement parts or some extra help with ordering them, 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\">, where you can chat with a pro, read our DIY blog and more.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Be sure to <\/span><a href=\"https:\/\/www.youtube.com\/@appliancepartspros\/videos\"><b>subscribe to us on YouTube<\/b><\/a><span style=\"font-weight: 400\"> and 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>Keep Reading:\u00a0<\/b><\/p>\n<p><a href=\"https:\/\/www.appliancepartspros.com\/b\/diy-mrcool-units-be-your-own-hvac-hero\/\"><b>Diy Mrcool Units: Do Your Own Heating And Air Conditioning<\/b><\/a><\/p>\n<p><a href=\"https:\/\/www.appliancepartspros.com\/b\/what-is-a-ductless-mini-split-ac-and-how-does-it-work\/\"><b>What is a Ductless Mini-Split Air Conditioner And How Does it Work?<\/b><\/a><b>\u00a0\u00a0<\/b><\/p>\n<p><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-clean-your-ac-unit-filter\/\"><b>How to Clean Your Air Conditioner the Easy Way<\/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 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Don\u2019t worry! Learn how to troubleshoot and get your AC working again with these simple steps.<\/p>\n","protected":false},"author":3,"featured_media":15417,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[16,8],"tags":[6049,6048,6046,2102,5910,6050,6047,6051,1551,1549],"class_list":["post-15348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-conditioner","category-troubleshooting","tag-ac-not-turning-on","tag-ac-power-issues","tag-ac-wont-start","tag-air-conditioner-problems","tag-air-conditioner-repair","tag-fix-window-ac","tag-troubleshooting-ac","tag-window-ac-issues","tag-window-ac-troubleshooting","tag-window-air-conditioner"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>7 reasons why your window air conditioner won\u2019t start<\/title>\n<meta name=\"description\" content=\"Is your window air conditioner not starting? 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