Relighting the Pilot Light on an Old Furnace: 1 Minute to Safely Restart Your Home Heating System

Relighting the pilot light on an old furnace can seem daunting, but with the right approach, it’s a safe and relatively straightforward task. The pilot light is a small gas flame that ignites the burners in your furnace; if it goes out, your furnace won’t heat your home. Before you start, make sure to read your furnace’s manual—some older systems have specific components or steps unique to their design.

First, locate the pilot light assembly. This is typically found near the bottom of the furnace. You should see a knob with OFF, ON, and PILOT settings, and usually a red or black reset button nearby. Turn the gas control knob to OFF and wait at least five minutes to allow any lingering gas to dissipate. This step ensures safety by minimizing the risk of ignition outside the intended area.

Once you've waited, turn the knob to PILOT and press down to start the gas flow to the pilot. Simultaneously, press and hold the reset button (if your unit has one) and use a long lighter or match to ignite the pilot light. Keep the button and knob pressed for about 30 seconds to allow the thermocouple (the safety sensor) to heat up. Then, slowly release the button; the pilot should remain lit. If it turns off, repeat the process once more. If it still won’t stay lit, you may need professional assistance to check for faulty components.

As a designer, I always think about safety and usability in home systems. If you're updating your home’s mechanicals or notice your furnace is consistently problematic, it might be worth considering an efficient redesign of the utility space as part of a home designer project, integrating modern solutions and improving overall functionality. This approach not only streamlines maintenance but also enhances the comfort and safety of your living environment.

Tips 1:

Always turn off the gas and let the area air out for a few minutes before attempting to relight the pilot. Keep a flashlight handy for better visibility in dimly lit spaces.

FAQ

Q: Why does my furnace pilot light keep going out?

A: Common reasons include a faulty thermocouple, drafty conditions, or a buildup of dirt on the pilot assembly. Routine maintenance can help prevent these issues.

Q: How do I know if my old furnace is safe to use?

A: Annual inspections by a certified HVAC technician are recommended for older units to check for gas leaks, proper venting, and operational safety.

Q: What tools do I need to relight a furnace pilot light?

A: Typically, you just need a long lighter or match and possibly a flashlight. Always follow your unit’s manufacturer instructions.

Q: Can I upgrade my furnace manually or do I need professional help?

A: For pilot relighting or simple cleaning, DIY is fine. But for replacements, repairs, or upgrades, consult a licensed professional.

Q: Is it more energy-efficient to keep an old furnace or replace it?

A: Newer furnaces are generally far more efficient and safer; replacing an old unit can lower energy bills and improve reliability.