{"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":"2026-06-19T11:06:42","modified_gmt":"2026-06-19T18:06:42","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 important to determine whether the problem is part of a broader HVAC system diagnosis that requires hvac repair service. Common causes and signs 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\n\n\n<li><strong>Other warning signs:<\/strong> Unusual noises, weak airflow, inconsistent temperatures, unexpected spikes in utility bills, frequent cycling, and unpleasant odors can also point to a system problem; foul odors may indicate biological buildup in ducts or electrical issues, so do not ignore what you notice.<\/li>\n<\/ul>\n\n\n\n<p>As part of the troubleshooting process, basic checks like inspecting the thermostat, clearing the vents, and removing debris from around the outdoor condenser unit can sometimes help maintain HVAC efficiency and restore comfort before professional help is needed, and it helps to document symptoms, timing, noises, odors, and thermostat behavior before your appointment.<\/p>\n\n\n\n<p>If those steps do not fix the issue, contact a licensed contractor for a service visit. A licensed HVAC technician with the right expertise can diagnose the problem, explain the work so customers understand it, and provide detailed support, including a clear quote, with EPA certification where refrigerants are involved; twice-yearly HVAC inspections can also help identify potential issues before they turn into repairs.<\/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 with basic filter maintenance as part of routine maintenance. The air filter for your furnace needs to be changed for a clean one every 1 to 3 months to help ensure optimal airflow and save money by reducing strain on heating and cooling equipment. 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. Rising utility costs can also signal reduced efficiency from dirty coils or damaged mechanical parts; according to the Department of Energy, heating and cooling account for 55% of home energy use, so keeping the system energy efficient helps it run effectively. 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. Banging or squealing sounds may point to loose parts or failing bearings.) 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 to help technicians determine what repair work is needed.<br><\/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. Air conditioning equipment involving refrigerants must be opened or repaired only by technicians with valid EPA 608 certification. Like other components connected to the gas line of the furnace, only licensed professionals can safely fix the flame sensor, and qualified technicians may also service different brands when diagnosing related HVAC issues.<\/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, homeowners should first check that the thermostat is set to the correct mode and that the batteries are working\u2014an easy first step before assuming repair is needed. However, the thermostat may be inaccurately sensing temperatures in your house because of a miscalibration. Inconsistent temperatures from room to room can also signal a thermostat problem, such as a failing compressor or thermostat malfunction. When this occurs, the thermostat might think the house is warmer than it is and turn the furnace off too early, so your home may not receive the warm or cool air you expect. 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\/\"><\/a><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 ensure it is fixed properly or the thermostat unit is replaced, and to learn whether repair or replacement is the right next step.<\/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 inspect the full hvac system and recommend repair or replacement based on its age and condition, whether that includes a heat pump or other equipment. Industry guidelines often suggest replacing the unit if the repair cost multiplied by its age exceeds $5,000. Before choosing a company, consult trusted local sources, verify contractor ratings, and compare multiple bids, each contractor\u2019s diagnosis, estimated costs, timelines, and warranties; HVAC installation often takes one to three days depending on system complexity and home size, and you can also request details on ac services, installations, and whether the team can install a new system installed for your yakima home in the wider yakima valley with a prompt schedule if you are ready to move forward today. For a 2,000-square-foot home, cooling equipment is often sized at roughly 2.5 to 5 tons. For the same home, a furnace may need about 50,000 to 80,000 BTUs. Keep in mind that installation or maintenance costs vary based on the style of unit and the specific services required, and some contractors offer financing options or another payment option to help you pay for a broad range of work while evaluating replacement options for reliable year-round performance, including seasons heating needs. In Washington, the contractor should hold the proper specialty HVAC license, as requirements are handled at the state level, and, depending on the job, may also need electrical or plumbing licensure. For air conditioning work involving refrigerants, technicians should also hold valid EPA 608 certification, and some projects may require certified electricians. Verify the company is bonded and insured to help protect against accidental property damage during service and choose professionals you can trust.<\/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<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":7,"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/posts\/518\/revisions"}],"predecessor-version":[{"id":1268,"href":"https:\/\/www.thermallheating.com\/blog\/wp-json\/wp\/v2\/posts\/518\/revisions\/1268"}],"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}]}}