Furnace Pilot Light Lit But Not Burner, Some conditions that cause unexpected furnace fan cycling on and off may be dangerous, risking overheating of the furnace heat exchanger which in turn risks cracks and even carbon monoxide leaks. Most outages arise from simple, actionable causes such as a draft, a dirty pilot orifice, or a failing thermocouple. 5 days ago · Gas furnace fails to ignite? Get expert troubleshooting tips for Big Bear homes. About This Product Is your gas furnace or water heater pilot light acting up – going out, not staying lit, or not lighting at all? The problem is often this little part right here: the combined thermocouple and pilot burner assembly. What does it mean if the burners light, then shut off after a few seconds? That’s commonly a flame-sensing problem. 5 days ago · The furnace shuts the burners off but keeps the blower running to cool itself down. Understanding how to diagnose causes, relight safely, and maintain the unit helps restore hot water quickly and reduces risk. Some of these issues can be resolved by cleaning the affected component while others may require replacement of the affected part. If the pilot light fails to ignite or stay lit, it may indicate issues with the gas supply, ignition system, or other components. Troubleshooting: A lit pilot light is a crucial indicator of the furnace’s proper operation. This problem can result from several factors including faulty components, blocked parts, or safety mechanisms preventing ignition. I need someone who will not charge an arm and leg since my water heater is out too and am getting that replaced this week too. Call Now! 6 days ago · Ignition or Pilot Light Failure: In older units, a pilot light that won't stay lit prevents the furnace from starting. This article explains common causes, step-by-step troubleshooting, safety precautions, repair options, and when to call a professional to restore reliable heating. Is your furnace not blowing hot air? Discover common causes and easy fixes to troubleshoot your heating system before making a costly service call. Securely close the furnace panel or door. A dirty flame sensor is a frequent cause, and it can make the furnace shut the gas off quickly even though ignition started normally. So it is worth 4 days ago · Is your pilot light out? Learn how to safely check your thermocouple and gas valve, and why your water heater won't ignite in the GTA. The thermocouple is responsible for keeping the pilot light lit; it does not control the burners' operation. Dec 7, 2025 · Systematically troubleshoot why your furnace pilot stays lit but the main burners won’t ignite, from simple sensors to complex gas valve issues. Perfect for when you're dealing with intermittent pilot issues, weak flames, or complete failure to light. It's a direct replacement for part number 002003F and compatible with Honeywell models Q3451B1103, Q3451B1178, and Q3451B1186. Many older furnace models use a gas furnace pilot light—a small blue flame that ignites the burners and keeps your system running. Sep 6, 2025 · The furnace pilot light is on but the main burners do not ignite, leaving a home without heat. Perhaps you’re just getting home from work on a cold winter evening. This article describes what to check if the warm air heating blower fan cycles on and off after the call for heat has stopped, that is after the room thermostat has been satisfied. In this guide, we will walk you through the steps to relight the pilot light on your gas furnace, as well as provide troubleshooting tips to address common issues like pilot light not staying lit, not igniting, or not relighting after a gas shutoff. Once the 30 seconds have passed and the pilot light is dancing merrily, release the control knob. That function is managed by your fan limit control, which operates based on temperature. Blower door will not stay closed, Blower motor running all the time, Blown fuses, Carbon monoxide detector keep going off, Circuit board keeps blowing fuses, fuse, Crack in the heat exchanger, Cracks around the base of the furnace, Cracks in the firebox, Dirty air filters, Dirty registers, grills, grill, walls, Draft motor will not start, Duct . Afterwards, turn the control knob to the “on” position, opening the doors for the main burner to join the party. Jan 26, 2026 · When your furnace runs but doesn’t blow hot air, the most common causes are thermostat issues, a clogged air filter, pilot light or ignitor failure, or a tripped safety switch. Nov 15, 2025 · First, your pilot light burns gas, costing you money and potentially eating up the surrounding area. Pool and spa owners with Raypak heaters, this pilot burner ignitor kit is probably what you need if your heater won't light or stay lit. In newer systems, a faulty electronic ignitor or flame sensor can be the problem, preventing the burners from firing up safely. Nov 22, 2021 · Furnace Pilot Light Lit But Not Burner (Fix It Now!) Unfortunately, it happens more often than you can imagine. Sep 13, 2023 · Possible reasons furnace burners will not ignite despite the pilot light being lit include a dirty flame sensor, a bad thermocouple, an open limit switch, a dirty pilot orifice, or a malfunctioning gas valve. Pilot light is still lit, fan turns on, thermostat still works and will turn on fan but the furnace will not kick on. Your furnace only uses a small amount of gas to power the pilot light. Skylands Energy Offers Superior HVAC Services & More. A pilot light going out on a Rheem water heater can disrupt hot water and signal a safety concern. Learn safe DIY fixes and when to call a pro for your heating problems. Oct 25, 2025 · The scenario where a furnace’s pilot light remains lit but the burners fail to ignite is a common and frustrating issue for American homeowners. The new assembly lights consistently, stays lit, and provides that reliable pilot flame your main burner needs to function properly. 3 days ago · Explore The Most Common Reasons Why Your Furnace Pilot Light Dies After Heating. It can stem from a few core problems, from a faulty thermocouple to a clogged burner or a safety switch tripping. This is a Robert Shaw brand replacement, an 18-inch long assembly designed for natural gas (NG) systems. If the pilot light stays lit you’ve successfully tamed the furnace. If you switch your pilot light off, your air conditioner won’t have to work as hard to reverse the heating effect of the pilot light. Faulty Limit Switch – This safety device turns off the burner if the furnace overheats, sometimes causing it to blow cold air instead of warm. So, you head straight to the furnace and switch it ON – but nothing happens. Oct 20, 2025 · The following guide explains why a furnace pilot light can stay on while burners won’t light, outlines common causes, provides step-by-step steps for safe troubleshooting, and highlights when to seek professional help. Aug 7, 2025 · When a furnace pilot light is lit but the burners won’t ignite, it can indicate an underlying issue that impacts heating efficiency and home comfort. Dec 19, 2025 · If you have an older furnace, you may be wondering how do I manually light my furnace pilot light when your heat suddenly stops working. 6 days ago · Inefficient or Malfunctioning Pilot Light or Ignition System – If the pilot light is out or the electronic ignition isn’t working, the furnace won’t produce heat. 1rupy, 3uqiib, 92uu4g, b2xm, ak1q, 88csb, 2pnl, g50hhw, twatl, 3ankhm,