Pilot Light Is Lit But Furnace Won’t Kick On: A Comprehensive Troubleshooting Guide
In the midst of a chilly winter evening, nothing can be more frustrating than a furnace that refuses to kick on, leaving you shivering in the cold. If you’ve found yourself in this predicament and checked that the pilot light is lit, the issue may lie elsewhere. This comprehensive troubleshooting guide will delve into the possible causes and provide step-by-step solutions to get your furnace up and running.
Before we dive into the technicalities, let’s first understand the basics of a furnace and its pilot light. The pilot light is a small flame that continuously burns to ignite the gas when the furnace is turned on. If the pilot light is lit but the furnace won’t kick on, it could indicate a problem with the gas supply, ignition system, or other components.
Troubleshooting the Gas Supply
Gas Valve:
The gas valve controls the flow of gas to the burners. Ensure that the gas valve is fully open. If it’s partially closed or jammed, the furnace may not receive enough gas to ignite.
Tip: If you’re comfortable, you can attempt to manually open the gas valve using pliers or a wrench. However, if you’re unsure, it’s best to call a licensed technician for assistance.
Gas Line:
Inspect the gas line for any kinks or blockages that could restrict the gas flow. Ensure that the gas line is properly connected to the furnace and free of any leaks.
Expert Advice: If you suspect a gas leak, evacuate the area immediately and call your gas company or a qualified technician. Never attempt to repair a gas leak yourself.
Ignition System Issues
Igniter:
The igniter is responsible for creating the spark that ignites the gas. If the igniter is faulty, the furnace won’t be able to light. Check if the igniter is glowing when the furnace is turned on. If it’s not, it may need to be replaced.
Tip: Consult the furnace’s user manual for instructions on how to access and replace the igniter. If you’re not confident in your abilities, call a technician.
Ignition Control Module:
The ignition control module sends the signal to the igniter to create the spark. If the module is malfunctioning, the furnace won’t ignite.
Expert Advice: Troubleshooting the ignition control module can be complex. It’s advisable to seek professional help from a licensed technician.
Other Possible Causes
Air Flow:
Insufficient air flow can prevent the furnace from igniting. Check if the air filter is clean and unobstructed. A dirty filter can restrict air flow and cause the furnace to overheat, leading to a safety shutdown.
Tip: Replace the air filter regularly (usually every 3-6 months) to ensure optimal air flow.
Electrical Issues:
Electrical problems, such as faulty wiring or a blown fuse, can disrupt the operation of the furnace. Inspect the electrical connections and fuses to ensure they are secure and in good condition.
Expert Advice: If you’re not comfortable working with electricity, entrust an electrician with troubleshooting and repairing any electrical issues.
Frequently Asked Questions (FAQs)
Q: Why won’t my furnace kick on even though the pilot light is lit?
A: There could be various reasons, including issues with the gas supply, ignition system, air flow, or electrical connections.
Q: How can I tell if the gas valve is open enough?
A: The handle of the gas valve should be turned fully perpendicular to the gas line. If it’s only partially open, the furnace may not receive enough gas.
Q: Is it safe to open the gas valve myself?
A: If you’re comfortable working with gas and have the proper tools, you can attempt to manually open the gas valve. However, if you’re unsure, it’s highly recommended to contact a licensed technician.
Conclusion
Troubleshooting a furnace that won’t kick on when the pilot light is lit can be daunting, but it’s possible with a systematic approach. By following the steps outlined in this guide, you can identify the potential cause and take the necessary measures to resolve the issue. If you’re unable to diagnose or fix the problem yourself, don’t hesitate to seek professional help from a qualified HVAC technician. By addressing the underlying cause, you can restore your furnace’s functionality and ensure a warm and comfortable home during the chilly winter months.
Are you interested in more home maintenance tips and tricks? Stay tuned for our upcoming articles where we’ll delve into various aspects of homeownership and provide expert guidance to help you keep your home in top condition.
