{"id":13789,"date":"2025-03-20T07:45:02","date_gmt":"2025-03-20T14:45:02","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=13789"},"modified":"2026-07-14T10:50:12","modified_gmt":"2026-07-14T17:50:12","slug":"how-to-test-a-furnace-limit-switch-with-a-multimeter","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/how-to-test-a-furnace-limit-switch-with-a-multimeter\/","title":{"rendered":"How to test a furnace limit switch with a multimeter"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Learn how to test a furnace limit switch with a multimeter to troubleshoot your furnace efficiently and keep it running smoothly.<\/p>\n","protected":false},"author":3,"featured_media":13844,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"How to test a furnace limit switch with a multimeter","_yoast_wpseo_title":"%%title%% %%page%%","_yoast_wpseo_metadesc":"Learn how to test a furnace limit switch with a multimeter to troubleshoot your furnace efficiently and keep it running smoothly.","_aviaLayoutBuilderCleanData":"[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-28.jpg' attachment='13845' 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-1dim8zh' 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-m5v9nc69' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">If your furnace isn't keeping you warm or keeps shutting off randomly, the limit switch might be acting up. Testing it yourself can save you some time and money, and it's easier than you'd think. Let's walk through how to check your furnace limit switch using a multimeter.<\/span>\r\n\r\n<em><span style=\"font-weight: 400;\">This info might not match your specific furnace model exactly. We aim to offer helpful advice for all DIY repairs, but different models can have variations in steps, error codes, parts, and so on. For the most accurate guidance, it's a good idea to consult your manufacturer's documentation or <\/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;\"> with any questions.<\/span><\/em>\r\n\r\n[lwptoc numeration=\"none\"]\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;\">What's a furnace limit switch?<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Before we get started, let's quickly cover what the furnace limit switch does. It's a safety device near your furnace's heat exchanger. It keeps tabs on the temperature inside the furnace and shuts it off if things get too hot. This helps prevent overheating and potential damage.<\/span>\r\n<h2><span style=\"font-weight: 400;\">What you'll need<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">To test your furnace limit switch, grab these tools:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A multimeter (one with a continuity setting works best)<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Screwdrivers or nut drivers\u00a0\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Your phone camera or a notepad to keep track of wire connections<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Optional: A hairdryer or heat gun to test with heat<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">Step-by-step guide to test your furnace limit switch<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Always put safety at the top of your list when working with appliances. Before you do anything, find your furnace's power switch or circuit breaker and turn it off. This prevents any electrical mistakes while you're working.<\/span>\r\n\r\n<b>Access the limit switch<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You'll need to find and access the limit switch inside your furnace. It's usually near the heat exchanger, a small rectangular piece with wires attached.\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If you're not sure, check your furnace's manual or <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-find-your-appliances-model-number\/\"><span style=\"font-weight: 400;\">learn how to find your appliance's model number<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use a screwdriver or nut driver to take off the furnace's access panel so you can see inside.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">3. Disconnect the limit switch. Take a photo or write down how the wires are connected first. This will help you put everything back correctly later.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Carefully remove the wires from the switch terminals.<\/span><\/li>\r\n<\/ol>\r\n<b> Test with a multimeter<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Set the multimeter dial to the continuity setting, usually shown by a sound wave or diode symbol. This lets you check if a circuit is complete.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If there's no continuity setting, set it to measure resistance (ohms), shown by the \u03a9 symbol.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Touch the multimeter probes to the terminals on the limit switch. It does not matter which probe goes where.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">At room temp, the limit switch should be closed, meaning the circuit's complete. Your multimeter should beep or show a continuous reading, indicating continuity. On a resistance setting it should display a low resistance value, close to zero ohms.<\/span><\/li>\r\n<\/ol>\r\n<span style=\"font-weight: 400;\">If it shows continuity, the switch is closed as it should be at room temp. If there's no continuity (no beep or infinite resistance), the switch might be faulty.<\/span>\r\n\r\n<b> Test the limit switch with heat\u00a0\u00a0<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To check if the switch opens when it gets hot, gently heat the limit switch with a hairdryer or heat gun. Be careful not to overdo it or cause damage.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">As it warms up, the switch should open, breaking the circuit.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This change means the limit switch is doing its job, opening when it reaches its high temp setting (usually between 150\u00b0F and 200\u00b0F).<\/span><\/li>\r\n<\/ol>\r\n<span style=\"font-weight: 400;\">If you need a replacement, you can find the right part at <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><span style=\"font-weight: 400;\">AppliancePartsPros.com<\/span><\/a><span style=\"font-weight: 400;\">. Have your furnace's model number handy; if you're not sure where to find it, <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-find-your-appliances-model-number\/\"><span style=\"font-weight: 400;\">here's how<\/span><\/a><span style=\"font-weight: 400;\">.<\/span>\r\n\r\n<b> Reassembly<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If you heated the switch, give it time to cool down.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use your notes or photo to reconnect the wires properly.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Put the furnace's access panel back on securely.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Restore power to the furnace and set your thermostat to call for heat.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Make sure the furnace operates normally without unexpected shutoffs.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">Additional help<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">For more help with furnace repairs, swing by our <\/span><a href=\"https:\/\/www.appliancepartspros.com\/repair-help\/\"><span style=\"font-weight: 400;\">repair help<\/span><\/a><span style=\"font-weight: 400;\"> section. If you find out you need a new part or more help, we're here for you.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Visit <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><span style=\"font-weight: 400;\">AppliancePartsPros.com<\/span><\/a><span style=\"font-weight: 400;\"> for genuine replacement parts and expert advice on your furnace and other appliances. Stay connected 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, updates, and support.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">If you've got any questions or need a hand, don't hesitate to <\/span><a href=\"https:\/\/www.appliancepartspros.com\/repair-help\/\"><span style=\"font-weight: 400;\">contact us<\/span><\/a><span style=\"font-weight: 400;\">. We're here to make your DIY repair journey as smooth as possible.<\/span>\r\n\r\n<b>Read more: <\/b>\r\n\r\n<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\r\n<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\r\n<a href=\"https:\/\/www.appliancepartspros.com\/b\/your-guide-to-choosing-a-space-heater\/\"><b>Your guide to choosing a space heater<\/b><\/a>\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_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-n58fr1']\r\n\r\n","_aviaLayoutBuilder_active":"active","footnotes":""},"categories":[4405],"tags":[4254,4290,4255,4257,4351,4288],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>How to test a furnace limit switch with a multimeter<\/title>\r\n<meta name=\"description\" content=\"Learn how to test a furnace limit switch with a multimeter to troubleshoot your furnace efficiently and keep it running smoothly.\" \/>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-test-a-furnace-limit-switch-with-a-multimeter\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"How to test a furnace limit switch with a multimeter\" \/>\r\n<meta 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