
{"id":13717,"date":"2025-03-19T06:47:03","date_gmt":"2025-03-19T13:47:03","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=13717"},"modified":"2026-07-14T10:48:58","modified_gmt":"2026-07-14T17:48:58","slug":"tips-for-troubleshooting-a-furnace-that-runs-constantly","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/tips-for-troubleshooting-a-furnace-that-runs-constantly\/","title":{"rendered":"Tips for troubleshooting a furnace that runs constantly"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Discover helpful tips for troubleshooting a furnace that runs constantly, with easy DIY fixes to get your system back on track.<\/p>\n","protected":false},"author":3,"featured_media":13765,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Tips for troubleshooting a furnace that runs constantly","_yoast_wpseo_title":"%%title%% %%page%%","_yoast_wpseo_metadesc":"Discover helpful tips for troubleshooting a furnace that runs constantly, with easy DIY fixes to get your system back on track.","_aviaLayoutBuilderCleanData":"[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-18.jpg' attachment='13766' 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-1ardadx' 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-m5qsxfik' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">Is your furnace running non-stop, turning your home into a sauna or driving up those energy bills? A furnace that won\u2019t quit isn\u2019t just annoying\u2014it could be signaling some issues that need attention. Let\u2019s take a look at some common reasons this might be happening and what you can do about it.<\/span>\r\n\r\n<em><span style=\"font-weight: 400;\">The info here might not fit every furnace out there. We aim to share helpful tips for all kinds of DIY appliance fixes, but different models can have their quirks\u2014like unique troubleshooting steps, error codes, or parts. For spot-on guidance, it's best to check 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;\"> if you've got questions.<\/span><\/em>\r\n\r\n[lwptoc numeration=\"none\"]\r\n<div style=\"border-left:4px solid #E89805;background:#FFF8EC;padding:9px 14px;margin:14px 0;font-size:14.5px;line-height:1.5;color:#1A1A1A;font-family:system-ui,-apple-system,sans-serif\">\u26a0\ufe0f <b>Smell gas?<\/b> Stop \u2014 get outside, then call your gas utility (or 911) from there. <a href=\"#app-safety-notes\">Full safety notes below<\/a>.<\/div>\n\n<h2><span style=\"font-weight: 400;\">Check the air filter<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">A clogged air filter is often the main culprit when your furnace runs constantly. When it gets blocked, airflow is restricted, causing the furnace to overheat and run longer to maintain the temperature you\u2019ve set.<\/span>\r\n\r\n<b>How to replace the air filter:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn off your furnace at the thermostat or breaker.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the air filter compartment, usually where the return duct meets the furnace.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remove the old filter (and try not to make a mess!).<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check the size and type printed on the edge of the filter.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Replace it with a new one of the same size. If you're unsure, our guide can help you find your appliance\u2019s model number.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insert the new filter with the airflow arrows pointing toward the furnace.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Close everything up and turn the furnace back on.<\/span><\/li>\r\n<\/ol>\r\n<b>Tip:<\/b><span style=\"font-weight: 400;\"> Change your filter every month to keep things running smoothly.<\/span>\r\n<h2><span style=\"font-weight: 400;\">Check the thermostat settings<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Your thermostat could be throwing things off. If it\u2019s set incorrectly, your furnace might be overworking itself.<\/span>\r\n\r\n<b>Adjusting your thermostat:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check the temperature it\u2019s set to.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If it's set above 78\u00b0F, try lowering it a bit.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Make sure the thermostat is set to \u201cHeat\u201d and the fan is on \u201cAuto\u201d (not \u201cOn\u201d). \u201cOn\u201d means the fan runs all the time, while \u201cAuto\u201d only runs it when heating.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If you haven't already, swap out the thermostat batteries.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If you have a programmable thermostat, make sure the schedule is correct.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wipe down your thermostat with a soft cloth to remove any dust.<\/span><\/li>\r\n<\/ol>\r\n<b>Read more: <\/b><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<h2><span style=\"font-weight: 400;\">Check the gas supply<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">If the gas valve isn\u2019t open all the way, your furnace may be working overtime without heating properly.<\/span>\r\n\r\n<b>How to check the gas valve:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the gas valve on your furnace (usually at the bottom).<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ensure the handle is parallel to the gas line\u2014this means it\u2019s open. If it\u2019s perpendicular, turn it so it\u2019s parallel.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inspect the gas line for any damage or leaks. If you smell gas, leave the house immediately and call your gas company.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After adjusting the valve, you may need to relight the pilot light. Follow your furnace\u2019s instructions.<\/span><\/li>\r\n<\/ol>\r\n<b>Read more: <\/b><a href=\"https:\/\/www.appliancepartspros.com\/b\/your-guide-to-choosing-a-space-heater\/\"><b>Your guide to choosing a space heater<\/b><\/a>\r\n<h2><span style=\"font-weight: 400;\">Check the pilot light<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">If your pilot light is malfunctioning, it could cause your furnace to run non-stop without properly heating the home.<\/span>\r\n\r\n<b>How to check the pilot light:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Find the pilot light assembly on your furnace.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ensure the flame is steady and blue. If it\u2019s yellow or flickering, that\u2019s a problem.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Clean out the pilot orifice with a needle if it\u2019s clogged.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Relight the pilot light according to your furnace\u2019s instructions.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">Adjust the fan limit switch<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">The fan limit switch controls when the blower fan turns on and off. If it\u2019s not set correctly, it could cause the fan to run all the time.<\/span>\r\n\r\n<b>How to adjust the fan limit switch:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn off the power to the furnace.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the fan limit switch near the blower.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the switch is pressed in, gently pull it out to set it to \"Auto.\"<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Clean it using compressed air.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn the power back on and check the furnace's behavior.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">Clean the blower\u00a0<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">If the blower is full of dust, it can restrict airflow and force the furnace to run longer to heat your home.<\/span>\r\n\r\n<b>How to clean the blower:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn off the furnace power at the breaker.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remove the access panel to reach the blower assembly.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Disconnect any wires, taking photos if needed for reference.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remove the blower and use a vacuum with a brush attachment to clean the blades.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Apply a few drops of electric motor oil to the appropriate spots.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reassemble everything and turn the power back on.<\/span><\/li>\r\n<\/ol>\r\n<b>Tip:<\/b><span style=\"font-weight: 400;\"> Regularly cleaning the blower helps your furnace run efficiently.<\/span>\r\n\r\n<b>Read more: <\/b><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<h2><span style=\"font-weight: 400;\">Additional information<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Thanks for reading! If you need replacement parts, grab your model number and head 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 help 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:#E89805;color:#fff;padding:9px 16px;font-weight:700;font-size:15px\">\ud83d\udd25&nbsp;Gas 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>Shut off the gas supply<\/b> before you start.<\/li><li style=\"margin:6px 0\">Follow your <b>local codes<\/b>.<\/li><li style=\"margin:6px 0\">Keep a <b>working carbon monoxide detector<\/b> nearby.<\/li><li style=\"margin:6px 0\">A <b>yellow or flickering flame<\/b> means incomplete combustion \u2014 fix it, don't ignore it.<\/li><li style=\"margin:6px 0\">If you smell a <b>strong, persistent gas odor<\/b>: get everyone outside, don't touch any switches or create a spark, and <b>call your gas utility or 911 from outside<\/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-lg7i6t']\r\n\r\n","_aviaLayoutBuilder_active":"active","footnotes":""},"categories":[4405,8],"tags":[4286,4287,4253,4255,4283,4285,4257],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Tips for troubleshooting a furnace that runs constantly<\/title>\r\n<meta name=\"description\" content=\"Discover helpful tips for troubleshooting a furnace that runs constantly, with easy DIY fixes to get your system back on track.\" \/>\r\n<meta name=\"robots\" content=\"index, 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