{"id":518,"date":"2022-12-05T11:00:00","date_gmt":"2022-12-05T19:00:00","guid":{"rendered":"https:\/\/www.thermallheating.com\/blog\/?p=518"},"modified":"2026-03-26T05:01:45","modified_gmt":"2026-03-26T12:01:45","slug":"why-wont-my-gas-furnace-stay-on","status":"publish","type":"post","link":"https:\/\/www.thermallheating.com\/blog\/heating-service\/why-wont-my-gas-furnace-stay-on\/","title":{"rendered":"Why Won\u2019t My Gas Furnace Stay On?"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"alignright size-medium\"><a href=\"https:\/\/www.thermallheating.com\/blog\/wp-content\/uploads\/2022\/12\/furnace-burners-small.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/www.thermallheating.com\/blog\/wp-content\/uploads\/2022\/12\/furnace-burners-small-300x200.jpg\" alt=\"HVAC repair service technician inspecting gas furnace burners with visible blue flames.\" class=\"wp-image-519\" srcset=\"https:\/\/www.thermallheating.com\/blog\/wp-content\/uploads\/2022\/12\/furnace-burners-small-300x200.jpg 300w, https:\/\/www.thermallheating.com\/blog\/wp-content\/uploads\/2022\/12\/furnace-burners-small-768x512.jpg 768w, https:\/\/www.thermallheating.com\/blog\/wp-content\/uploads\/2022\/12\/furnace-burners-small.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure><\/div>\n\n\n<p>A gas furnace that won\u2019t keep running long enough to warm up your house and keep it warm isn\u2019t of much use to you. If you start running into the problem of a furnace shutting off early, either after several minutes or less than a minute, you\u2019ll want to know why and what you can do to fix it.<\/p>\n\n\n\n<p>In some cases, a gas furnace shutting off early is because of a simple problem you can correct yourself. In other situations, you\u2019ll need professional <a href=\"\/heating\/furnaces\" target=\"_blank\" rel=\"noreferrer noopener\">furnace repair in Yakima, WA<\/a>. Below we\u2019ll look at some of the common reasons for this furnace malfunction.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Won\u2019t My Gas Furnace Stay On?<\/strong><\/h2>\n\n\n\n<p>If your gas furnace turns on but shuts off after a few minutes, it is usually caused by a safety or airflow issue that requires HVAC repair service. Common causes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Dirty air filter:<\/strong> Restricted airflow can overheat the system and trigger an automatic shutdown.<\/li>\n\n\n\n<li><strong>Faulty flame sensor:<\/strong> If the sensor cannot detect a steady flame, it shuts off the gas supply.<\/li>\n\n\n\n<li><strong>Malfunctioning limit switch:<\/strong> A failed safety switch may turn the furnace off too early.<\/li>\n\n\n\n<li><strong>Thermostat problems:<\/strong> Incorrect settings or wiring issues can cause short cycling.<\/li>\n\n\n\n<li><strong>Blocked vents or ducts:<\/strong> Poor airflow can force the system to overheat and shut down.<\/li>\n<\/ul>\n\n\n\n<p>If replacing the filter or checking thermostat settings does not resolve the issue, a licensed HVAC technician can diagnose and repair the problem safely.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Clogged air filter<\/strong><\/h3>\n\n\n\n<p>This is one of the simple issues you can fix on your own. The air filter for your furnace needs to be changed for a clean one every 1 to 3 months or it will risk causing operational problems for the furnace. When a congested filter cuts off the flow of air into the furnace, it can cause the heat exchanger to overheat because not enough air is moving around it to cool it down. The limit switch will shut the furnace off because of the overheating. Put in a new filter to see if this fixes the issue, and set down reminders for yourself to replace the filter regularly in the future. If short cycling continues, it\u2019s best to schedule an <a href=\"https:\/\/www.thermallheating.com\/blog\/heating-service\/never-ignore-furnace-problems-no-matter-the-time-of-year\/\">HVAC repair service for ongoing furnace issues<\/a> before the damage worsens.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Faulty limit switch<\/strong><\/h3>\n\n\n\n<p>We mentioned the limit switch above: it\u2019s a key part of integrating the operation of the blower fan and the gas burners to provide a steady and even heat flow from the furnace. It also turns the furnace off in case the heat exchanger gets too hot. If the limit switch malfunctions, it may shut the furnace off too early. (On the other hand, it can also cause the blower fan to run nonstop.) You must have professionals repair or replace the limit switch, especially if you\u2019ve also noticed <a href=\"https:\/\/www.thermallheating.com\/blog\/heating-service\/hearing-strange-noises-when-you-first-turn-on-your-furnace-heres-what-to-do\/\">HVAC repair service for furnace noises<\/a> may be necessary.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Faulty flame sensor<\/strong><\/h3>\n\n\n\n<p>This is another safety device that can end up doing its job <em>too<\/em> well! The flame sensor makes sure that the gas from the burners has ignited so unburned gas doesn\u2019t flood the combustion chamber and create a hazard of flame roll-out or other dangers. If the flame sensor isn\u2019t working, it will shut the gas flow to the burners off even if the burners have ignited. Like other components connected to the gas line of the furnace, only licensed professionals can safely fix the flame sensor.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Miscalibrated thermostat<\/strong><\/h3>\n\n\n\n<p>When your furnace starts to shut down too early, you probably first checked to make sure the thermostat was set correctly. However, the thermostat may be inaccurately sensing temperatures in your house because of a miscalibration. When this occurs, the thermostat might think the house is warmer than it is and turn the furnace off too early. Please don\u2019t push the thermostat setting higher to try to overcome this\u2014it needs<a href=\"https:\/\/www.thermallheating.com\/blog\/heating-service\/3-common-furnace-repairs-and-the-signs-of-each-one\/\"> professional HVAC repair service for thermostats<\/a> to either fix it or replace the thermostat unit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Aging furnace<\/strong><\/h3>\n\n\n\n<p>Is your gas furnace more than 15 years old? If so, then problems with reaching your desired indoor temperatures often mean the furnace has worn down past its useful point. You can ask our technicians to examine the heating system to see if it can be repaired or if a replacement is the better option.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Frequently Asked Questions<\/strong><\/h2>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can a gas furnace shutting off repeatedly damage the system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, short cycling can put extra strain on key components like the blower motor, ignition system, and heat exchanger. Frequent starts and stops increase wear and tear, reduce efficiency, and may lead to more expensive repairs if the underlying issue is not addressed promptly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is it safe to keep resetting my furnace if it will not stay on?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Repeatedly resetting your furnace is not recommended. While a single reset may temporarily restore operation, frequent resets can mask a more serious problem. If your furnace continues shutting off, it is safer to have a professional inspect the system rather than relying on repeated restarts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Could recent home renovations affect my furnace performance?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, renovations can impact airflow and system balance. Changes such as added insulation, sealed windows, or modified ductwork may alter how your furnace operates. Restricted airflow or altered return air pathways can contribute to cycling issues and inconsistent heating performance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does furnace age influence reliability issues?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"As a furnace ages, internal components naturally wear down, making it more prone to operational problems. Older systems may struggle to maintain consistent performance and may shut off more frequently. If your unit is nearing the end of its expected lifespan, replacement may be worth considering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"When should I call a professional instead of troubleshooting further?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If basic checks like thermostat settings and filter condition do not resolve the issue, or if you notice unusual smells, loud noises, or inconsistent heating, it is time to call a licensed technician. Prompt service helps prevent safety risks and more extensive system damage.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n\n\n\n<p><strong>Question: Can a gas furnace shutting off repeatedly damage the system?<\/strong><strong><br><\/strong><strong>Answer:<\/strong> Yes, short cycling can put extra strain on key components like the blower motor, ignition system, and heat exchanger. Frequent starts and stops increase wear and tear, reduce efficiency, and may lead to more expensive repairs if the underlying issue is not addressed promptly.<\/p>\n\n\n\n<p><strong>Question: Is it safe to keep resetting my furnace if it will not stay on?<\/strong><strong><br><\/strong><strong>Answer:<\/strong> Repeatedly resetting your furnace is not recommended. While a single reset may temporarily restore operation, frequent resets can mask a more serious problem. If your furnace continues shutting off, it is safer to have a professional inspect the system rather than relying on repeated restarts.<\/p>\n\n\n\n<p><strong>Question: Could recent home renovations affect my furnace performance?<\/strong><strong><br><\/strong><strong>Answer:<\/strong> Yes, renovations can impact airflow and system balance. Changes such as added insulation, sealed windows, or modified ductwork may alter how your furnace operates. Restricted airflow or altered return air pathways can contribute to cycling issues and inconsistent heating performance.<\/p>\n\n\n\n<p><strong>Question: How does furnace age influence reliability issues?<br>Answer:<\/strong> As a furnace ages, internal components naturally wear down, making it more prone to operational problems. Older systems may struggle to maintain consistent performance and may shut off more frequently. If your unit is nearing the end of its expected lifespan, replacement may be worth considering.<\/p>\n\n\n\n<p><strong>Question: When should I call a professional instead of troubleshooting further?<br>Answer:<\/strong> If basic checks like thermostat settings and filter condition do not resolve the issue, or if you notice unusual smells, loud noises, or inconsistent heating, it is time to call a licensed technician. Prompt service helps prevent safety risks and more extensive system damage.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"\/contact-us\/request-an-estimate\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Call ThermAll Heating &amp; Cooling, Inc: We are \u201cYour Home Comfort Hero!\u201d<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In some cases, a gas furnace shutting off early is because of a simple problem. In other situations, you\u2019ll need professional furnace repair.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[99,50,87],"class_list":["post-518","post","type-post","status-publish","format-standard","hentry","category-heating-service","tag-gas-furnaces","tag-heating-system-repair","tag-yakima"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/posts\/518","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/comments?post=518"}],"version-history":[{"count":6,"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/posts\/518\/revisions"}],"predecessor-version":[{"id":1179,"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/posts\/518\/revisions\/1179"}],"wp:attachment":[{"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/media?parent=518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/categories?post=518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/tags?post=518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}