{"id":838,"date":"2022-02-14T11:00:08","date_gmt":"2022-02-14T16:00:08","guid":{"rendered":"https:\/\/www.awheatingandcooling.com\/blog\/?p=838"},"modified":"2026-03-25T07:09:21","modified_gmt":"2026-03-25T11:09:21","slug":"help-my-furnace-wont-turn-on","status":"publish","type":"post","link":"https:\/\/www.awheatingandcooling.com\/blog\/heating-service\/help-my-furnace-wont-turn-on\/","title":{"rendered":"&#8220;Help! My Furnace Won&#8217;t Turn On!&#8221;"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"alignright\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/www.awheatingandcooling.com\/blog\/wp-content\/uploads\/2022\/02\/My-Furnace-Wont-Turn-On-300x200.jpg\" alt=\"Surprised woman adjusting red glasses, reacting to an unexpected home HVAC repair service problem.\" class=\"wp-image-839\" srcset=\"https:\/\/www.awheatingandcooling.com\/blog\/wp-content\/uploads\/2022\/02\/My-Furnace-Wont-Turn-On-300x200.jpg 300w, https:\/\/www.awheatingandcooling.com\/blog\/wp-content\/uploads\/2022\/02\/My-Furnace-Wont-Turn-On-768x512.jpg 768w, https:\/\/www.awheatingandcooling.com\/blog\/wp-content\/uploads\/2022\/02\/My-Furnace-Wont-Turn-On.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure><\/div>\n\n\n<p>The powerful heat provided by your furnace is crucial to keeping your home comfortable in the colder months. It\u2019s the dependable core of so much of what we do \u2013 all at the flick of a switch or a turn of a dial.<\/p>\n\n\n\n<p>But if you\u2019re reaching for the controls and finding your furnace won\u2019t turn on, it\u2019s natural you might feel a shiver down the spine \u2013 and not just because of the cold! Are you now going to have to pay out for repairs? In many cases, unusual behavior is an early warning, and recognizing<a href=\"https:\/\/www.awheatingandcooling.com\/blog\/heating-service\/heed-these-spooky-signs-you-need-furnace-repair\/\"> hvac repair service furnace warning signs<\/a> can help you act before the problem gets worse.<\/p>\n\n\n\n<p>Luckily, it might not be that drastic \u2013 but try a few troubleshooting tips out first. The issue with your furnace might not be as serious as you think.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why won\u2019t my furnace turn on?<\/h2>\n\n\n\n<p>If your furnace will not turn on, several common issues may require inspection or HVAC repair service. Before scheduling HVAC service, check these possible causes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Thermostat problems:<\/strong> Incorrect settings, dead batteries, or wiring issues can prevent the furnace from starting.<\/li>\n\n\n\n<li><strong>Tripped circuit breaker or power switch:<\/strong> A furnace may lose power if the breaker trips or the service switch is turned off.<\/li>\n\n\n\n<li><strong>Clogged air filter:<\/strong> Restricted airflow can cause the system to shut down for safety.<\/li>\n\n\n\n<li><strong>Ignition or pilot light failure:<\/strong> Gas furnaces may not start if the pilot light is out or the ignition system fails.<\/li>\n\n\n\n<li><strong>Safety switch or furnace door issue:<\/strong> An improperly closed access panel can trigger a safety switch and stop the system.<\/li>\n<\/ul>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">Furnace Won\u2019t Turn On? Check the Thermostat Settings First<\/h2>\n\n\n\n<p>The point of your thermostat is to set it and forget it, right? Absolutely \u2013 it\u2019s why they\u2019re such a popular feature in so many homes. But that doesn\u2019t mean a forgotten thermostat is always running as it should!<\/p>\n\n\n\n<p>In fact, it might be the cause of your furnace not turning on. Adjust the thermostat temperature and see if the furnace reacts by activating as it should. If it doesn\u2019t, the connection between your thermostat and the furnace might be what\u2019s gone wrong \u2013 and you might need a professional to sort that out.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Furnace Gas Supply Issues: What to Check (Shutoff Valve, Meter, Pilot)<\/h2>\n\n\n\n<p>If gas isn\u2019t reaching your furnace, it doesn\u2019t have any fuel with which to activate. This is a check best suited for a professional, but you can still check if there are any at-a-glance faults with any visible gas pipes \u2013 blockages, cracks, leaks, or the like. Problems with gas flow can sometimes point to more serious safety concerns, which is why many homeowners rely on<a href=\"https:\/\/www.awheatingandcooling.com\/blog\/heaters\/dont-let-your-furnace-suffer-from-this-dangerous-problem\/\"> hvac services for dangerous furnace issues<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Signs of a Bad Furnace Control Board (and When to Call a Pro)<\/h2>\n\n\n\n<p>The control board of your furnace is a crucial part of its overall mechanics. It\u2019s in charge of what activates when, which components work in harmony with which, and how to regulate temperature safely.<\/p>\n\n\n\n<p>Yet control boards themselves can definitely go awry. Safely check if there is a buildup of dirt, a broken button, loose wiring, or any other visible faults with the control board preventing the furnace from functioning.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Clogged Furnace Filter Symptoms and the Quick Fix<\/h2>\n\n\n\n<p>The air filter of your furnace is a vital part of its operation, and if it gets dirty or becomes clogged, things can escalate fast. In fact, even if this isn\u2019t why your furnace won\u2019t turn on, you ought to change a dirty air filter if you find one when checking it.<\/p>\n\n\n\n<p>This is one of the more common reasons why furnaces stop working \u2013 it\u2019s not efficient for a furnace to operate with blocked airflow.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common Furnace Electrical Problems (Power Switch, Breaker, Limit Switch)<\/h2>\n\n\n\n<p>Even gas-fired furnaces use circuitry to switch on and off, meaning almost every modern furnace uses circuit breakers as a safety feature in their ignition systems.<\/p>\n\n\n\n<p>Of course, these can still become faulty \u2013 and you can check circuit breakers in the home to see if they\u2019ve tripped. If so, it might be that you need replacement circuitry for your furnace, and in some cases homeowners begin considering<a href=\"https:\/\/www.awheatingandcooling.com\/blog\/heaters\/heater-replacement-when-your-furnace-is-ready-to-retire\/\"> hvac service when furnaces need replacement<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/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\": \"What do blinking lights or error codes on my furnace mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Many furnaces have a small diagnostic LED that flashes a pattern when something prevents startup. The code can point to issues like ignition failure, a safety switch, or airflow related shutdowns. Check the inside panel for a code chart or look up your model manual before calling.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can a dirty flame sensor keep a furnace from starting?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A flame sensor can get coated over time and fail to confirm a steady flame, causing the furnace to shut down shortly after trying to ignite. If your unit starts briefly and then stops, a technician may clean or replace the sensor and verify safe operation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"My furnace turns on for a minute and then shuts off. What could cause that?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Short cycling can happen when safety controls detect a problem, such as overheating, venting issues, or a component that is not proving ignition properly. It can also be tied to airflow balance or improper settings. Avoid repeated restarts and schedule service to prevent damage.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I press the furnace reset button if it will not start?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Use caution. One reset attempt is usually fine, but repeatedly pressing reset can worsen certain faults and may be unsafe if ignition is failing. If the furnace does not run normally after a single reset, stop troubleshooting and contact a professional to diagnose the underlying cause.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What safety steps should I take if I smell gas or my carbon monoxide alarm goes off?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Treat either as urgent. Leave the home immediately, do not operate switches or appliances, and call your gas utility or emergency services from outside. Do not try to relight anything or troubleshoot. Once the situation is cleared, a qualified HVAC professional should inspect the system.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n\n\n\n<p><strong>Question: What do blinking lights or error codes on my furnace mean?<\/strong><br><strong>Answer: <\/strong>Many furnaces have a small diagnostic LED that flashes a pattern when something prevents startup. The code can point to issues like ignition failure, a safety switch, or airflow related shutdowns. Check the inside panel for a code chart or look up your model manual before calling.<\/p>\n\n\n\n<p><strong>Question: Can a dirty flame sensor keep a furnace from starting?<\/strong><br><strong>Answer:<\/strong> Yes. A flame sensor can get coated over time and fail to confirm a steady flame, causing the furnace to shut down shortly after trying to ignite. If your unit starts briefly and then stops, a technician may clean or replace the sensor and verify safe operation.<\/p>\n\n\n\n<p><strong>Question: My furnace turns on for a minute and then shuts off. What could cause that?<\/strong><br><strong>Answer:<\/strong> Short cycling can happen when safety controls detect a problem, such as overheating, venting issues, or a component that is not proving ignition properly. It can also be tied to airflow balance or improper settings. Avoid repeated restarts and schedule service to prevent damage.<\/p>\n\n\n\n<p><strong>Question: Should I press the furnace reset button if it will not start?<\/strong><br><strong>Answer: <\/strong>Use caution. One reset attempt is usually fine, but repeatedly pressing reset can worsen certain faults and may be unsafe if ignition is failing. If the furnace does not run normally after a single reset, stop troubleshooting and contact a professional to diagnose the underlying cause.<\/p>\n\n\n\n<p><strong>Question: What safety steps should I take if I smell gas or my carbon monoxide alarm goes off?<\/strong><strong>Answer:<\/strong> Treat either as urgent. Leave the home immediately, do not operate switches or appliances, and call your gas utility or emergency services from outside. Do not try to relight anything or troubleshoot. Once the situation is cleared, a qualified HVAC professional should inspect the system.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>For reliable <a rel=\"noreferrer noopener\" aria-label=\"furnace repair in Maumee, OH (opens in a new tab)\" href=\"\/heating\/furnace-repair\" target=\"_blank\">furnace repair in Maumee, OH<\/a>, reach out to AW Heating &amp; Cooling. <a href=\"\/contact\/send-message\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Contact us (opens in a new tab)\">Contact us<\/a> today!<\/strong><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you\u2019re reaching for the controls and finding your furnace won\u2019t turn on, it\u2019s natural you might feel a shiver down the spine&#8230; what&#8217;s going on? <\/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":[108,93],"class_list":["post-838","post","type-post","status-publish","format-standard","hentry","category-heating-service","tag-furnace-repair","tag-maumee"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/posts\/838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/comments?post=838"}],"version-history":[{"count":6,"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/posts\/838\/revisions"}],"predecessor-version":[{"id":1823,"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/posts\/838\/revisions\/1823"}],"wp:attachment":[{"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/media?parent=838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/categories?post=838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.awheatingandcooling.com\/blog\/wp-json\/wp\/v2\/tags?post=838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}