{"id":13722,"date":"2025-03-19T06:55:55","date_gmt":"2025-03-19T13:55:55","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=13722"},"modified":"2026-07-14T10:49:08","modified_gmt":"2026-07-14T17:49:08","slug":"how-to-fix-gas-furnace-ignition-problems","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/how-to-fix-gas-furnace-ignition-problems\/","title":{"rendered":"How to fix gas furnace ignition problems"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Learn how to fix gas furnace ignition problems with these simple DIY tips to keep your furnace running smoothly all season long.<\/p>\n","protected":false},"author":3,"featured_media":13759,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_aviaLayoutBuilderCleanData":"[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/01\/Updated-blog-rectangle-16.jpg' attachment='13760' 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-115p0ka' 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-m5qtnazd' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">Gas furnace ignition issues are common problems that many homeowners face, and they can prevent your furnace from operating efficiently or at all. If your furnace isn\u2019t igniting, running continuously, or making unusual noises, it could be an ignition problem. Ignition issues can stem from several parts of the furnace, including the ignitor, flame sensor, gas valve, thermostat, and electrical components.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Taking the DIY route to solve these problems can save you time and money. We\u2019ll walk you through common ignition problems, how to identify them, and how to fix them yourself.<\/span>\r\n\r\n<em><span style=\"font-weight: 400;\">The details in this article are intended as general advice and may not directly correspond with your particular appliance model. Differences in model features and configurations could mean variations in troubleshooting methods, error messages, or required part replacements. For the best results, consult your appliance's technical documentation or user manual for guidance.<\/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;\">Safety precautions\u00a0\u00a0\u00a0<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Safety should always be a priority when working on any appliance. Here are a few practical tips to help you stay safe:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn off the power to the appliance by unplugging it or switching off the circuit breaker before starting any maintenance or repairs. This protects you from the risk of electric shock.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wear insulated gloves to shield your hands from sharp edges, pinching hazards, or debris.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Work at a steady pace and take your time to avoid accidents or injuries.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Make sure your workspace is well-lit so you can clearly see and access the parts you\u2019re working on.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Keep the area clear of clutter, and ensure children and pets stay out of the workspace.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Never handle internal parts with wet hands. Check that both your hands and the work area are completely dry.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Refer to your appliance\u2019s user manual for any specific instructions or safety guidelines related to the part or repair.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Handle parts gently to avoid damage to the appliance or potential injuries from applying too much force.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use safety glasses when dealing with chemicals, dust, or large debris to protect your eyes from harm.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the appliance was recently used, give it enough time to cool down before working on any heated components.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take photos or notes of wiring connections and terminals before disconnecting anything to make reassembly easier.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Avoid touching exposed wires or terminals. If you must handle wires, use non-conductive tools or wear insulated gloves to minimize the risk of electrical shock.<\/span><\/li>\r\n<\/ul>\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;\">Cause 1: Dirty or faulty ignitor<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">The ignitor is responsible for igniting the gas in the furnace. If it\u2019s dirty or damaged, it can prevent the furnace from lighting, which will leave you with a cold house. Here\u2019s how to identify and fix problems with the ignitor:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Furnace fails to ignite or makes repeated clicking sounds without lighting.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The furnace might try to start but then shut down after a short time.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You might hear a humming or buzzing sound instead of the usual ignition noise.<\/span><\/li>\r\n<\/ul>\r\n<b>How to clean or replace the ignitor:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Always start by turning off the furnace and disconnecting the power to avoid any electrical issues.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The ignitor is typically located near the burners or in the combustion chamber. Check your furnace\u2019s manual if you're unsure about its location.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Look for any visible damage or wear, such as cracks or discoloration.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the ignitor looks dirty, use a soft cloth or fine wire brush to gently clean off any dust or residue.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If cleaning doesn't resolve the issue or the ignitor is damaged, it's time to replace it.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take out the old ignitor by disconnecting the wires and unscrewing any fasteners.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Install the new ignitor in the same position, reconnect the wires, and secure it with screws.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once the ignitor is cleaned or replaced, reassemble everything, reconnect the power, and test your furnace to see if it lights up.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">Cause 2: Faulty flame sensor<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">The flame sensor is a safety feature in your furnace that detects whether or not the burner has lit. If the flame sensor is dirty or malfunctioning, it can cause the furnace to shut down prematurely, preventing it from reaching the desired temperature. Here's how to identify a faulty flame sensor:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Furnace starts, but then shuts off after a few minutes.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The furnace runs but doesn\u2019t heat properly.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A flashing light or error code indicating a flame detection issue.<\/span><\/li>\r\n<\/ul>\r\n<b>How to clean or replace the flame sensor:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">For safety, always turn off your furnace and disconnect the power before performing any work.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The flame sensor is usually located near the burner assembly, with a metal rod sticking out into the flame.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Look for any signs of dirt, buildup, or corrosion on the sensor. A dirty sensor will prevent it from detecting the flame properly.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use a soft cloth or fine steel wool to gently clean the sensor rod.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If cleaning doesn\u2019t work or the sensor is damaged, it will need to be replaced.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unscrew the mounting screws and disconnect the wires from the sensor.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Install the new flame sensor, ensuring it's positioned correctly, and reconnect the wires.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once the flame sensor is cleaned or replaced, put everything back together and test your furnace to see if it operates as expected.<\/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;\">Cause 3: Clogged or dirty gas valve<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">A clogged or dirty gas valve can disrupt the flow of gas to the burner, which can prevent your furnace from igniting or cause it to run inefficiently. Here\u2019s how to identify a problem with the gas valve:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The furnace is not igniting or doesn\u2019t run consistently.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You hear clicking sounds but no ignition after several attempts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gas smell near the furnace, indicating potential issues with gas flow.<\/span><\/li>\r\n<\/ul>\r\n<b>How to clean or replace the gas valve:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Before working on the gas valve, make sure to turn off both the furnace and the gas supply to avoid any safety hazards.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The gas valve is typically located near the burner assembly. Check your furnace\u2019s manual for the exact location.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Look for any visible dirt, debris, or blockages in the valve or its connections.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the valve is clogged, clean it gently with compressed air or a soft cloth.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To ensure the valve is functioning correctly, use a multimeter to check if it\u2019s allowing gas to flow properly.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check for continuity across the valve\u2019s terminals. If there\u2019s no continuity, the valve may need to be replaced.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the valve is beyond cleaning or if it\u2019s damaged, replace it with a new one that matches your furnace model.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To replace the valve, disconnect the gas line, unscrew the old valve, and install the new one. Reconnect the gas line and ensure everything is tightened properly.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once the gas valve is cleaned or replaced, reconnect everything, turn on the gas supply, and test the furnace to ensure proper operation.<\/span><\/li>\r\n<\/ol>\r\n<b>Pro tip: <\/b><span style=\"font-weight: 400;\">If you smell gas at any point during this process, stop immediately, leave the area, and contact your gas supplier for assistance.<\/span>\r\n<h2><span style=\"font-weight: 400;\">Cause 4: Thermostat issues<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Your thermostat plays a crucial role in controlling the furnace's operation, and if it\u2019s not working properly, it can lead to furnace ignition problems or inconsistent heating. Here's how to identify a thermostat issue:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The furnace doesn\u2019t turn on or off according to the set temperature.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The thermostat settings seem unresponsive, or the furnace continues running after reaching the set temperature.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The thermostat screen is blank or flickering.<\/span><\/li>\r\n<\/ul>\r\n<b>How to check and troubleshoot the thermostat:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ensure that the thermostat is set to \"Heat\" and not to \"Cool\" or \"Off.\"<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Double-check the temperature setting to ensure it's higher than the current room temperature.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If your thermostat uses batteries, check if the batteries are dead or low. Replace them with fresh batteries.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">For wired thermostats, check if the circuit breaker for the thermostat is on. If it\u2019s off, flip it back on.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inspect the thermostat wiring. Turn off the power to the furnace and remove the thermostat cover and check the wiring behind it. Look for any loose, frayed, or disconnected wires.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If any wires appear damaged, carefully reconnect them or replace the wires as necessary.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Test the thermostat with a multimeter by setting your multimeter to check for voltage.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Place the probes on the terminals of the thermostat to check for proper voltage when the thermostat is set to \"Heat.\"<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the multimeter reads zero voltage or irregular readings, the thermostat may need to be replaced.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the thermostat is still working but isn\u2019t accurate, you can try recalibrating it. Follow the manufacturer's instructions to reset or calibrate the settings to ensure accurate temperature readings.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If your thermostat is programmable, make sure the schedule is set correctly and matches your preferences.<\/span><\/li>\r\n<\/ol>\r\n<span style=\"font-weight: 400;\">If none of the above steps work, you may need to replace the thermostat. Purchase a replacement that matches the specifications of your current model.<\/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\n<div 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='' 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