$49 / month O.A.C Including Install
$49 / month O.A.C Including Install

Furnace Pilot Light Malfunctioning

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Furnace Pilot Light Malfunctioning

Posted On: December 29, 2024

Furnace Pilot Light Malfunctioning

If your furnace pilot light is malfunctioning, it can prevent your heating system from working effectively. Here’s a detailed guide to identify and resolve common pilot light issues:


1. Understand the Problem

The pilot light is a small flame that ignites the burners in your furnace. If it’s malfunctioning or won’t stay lit, your furnace may not generate heat.



2. Common Causes

  1. Dirty Pilot Orifice
    Dust, debris, or soot can clog the pilot orifice, reducing or extinguishing the flame.


  2. Thermocouple Issues
    The thermocouple is a safety device that shuts off the gas supply if the pilot light goes out. If it’s faulty or misaligned, the pilot may not stay lit.


  3. Drafts or Airflow Problems
    Strong drafts near the furnace can blow out the pilot light.


  4. Gas Supply Issues
    Insufficient gas pressure or a gas valve issue can prevent the pilot from staying lit.


  5. Malfunctioning Gas Control Valve
    If the gas valve is faulty, it may not release enough gas for the pilot light to ignite.



3. Troubleshooting Steps

a. Inspect the Pilot Light

  • Check if the flame is burning. A healthy pilot light should be steady and blue. If it’s yellow or flickering, it may indicate a problem with the gas mixture or airflow.

b. Relight the Pilot Light

  1. Turn off the furnace and wait for gas to dissipate (5-10 minutes).
  2. Locate the pilot light assembly and turn the gas control knob to "Pilot."
  3. Hold down the reset button and use a long lighter to ignite the flame.
  4. Release the button slowly after 30-60 seconds.

c. Clean the Pilot Orifice

  • Turn off the gas supply and use a needle or compressed air to remove debris from the pilot orifice.

d. Test the Thermocouple

  • Ensure the thermocouple is in direct contact with the flame. If misaligned, adjust its position.
  • If it’s worn out, replace the thermocouple.

e. Check for Drafts

  • Seal any openings near the furnace to prevent drafts from blowing out the flame.

f. Inspect Gas Supply

  • Verify that the gas valve is open and gas is flowing properly. Consult a professional if there’s a suspected gas pressure issue.

4. When to Call a Professional

  • If the pilot light still won’t stay lit after troubleshooting.
  • You suspect a gas leak or faulty gas valve.
  • There’s a persistent yellow or weak flame.

5. Maintenance Tips

  1. Schedule annual furnace maintenance.
  2. Keep the pilot light assembly clean.
  3. Regularly check for drafts and airflow issues.
  4. Monitor your furnace’s performance during the heating season.

Addressing a malfunctioning pilot light promptly ensures a warm and safe home. If in doubt, always consult a licensed HVAC technician.



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See What Our Customers Are Saying:

by Jennifer in Toronto on Twintech Heating and Cooling

I had cold and hot spots all over my 70 yr old home. My furnace is quite new and Greg optimized the fan and furnace. The original installer just took it out of the box with factory settings and installed it- basically running at 50% of capacity. Greg also routed heat into my laundry room, yeah - so now I can renovate laundry room - thanks Greg. He is honest, professional and knowledgeable. I will be calling him back in the spring to optimize my AC as well.

by Happy Homeowner in Toronto on Twintech Heating and Cooling

Wonderful from beginning to end. I tend to fret and worry about home improvements but the excellent team at TwinTech put my mind as ease. They listen, they are patient and best of all ... the work they did is amazing! I chose the Goodman 80K BTU 2 stage furnace and the matching Goodman air conditioner. Greg, Grant and Poitr "Peter" arrived on time, took great care, explained everything to me and they answered all of my questions. They carefully adjusted the factory settings to optimize the furnace for my house and they also checked the duct work in the basement. Dave, the Sales Manager, came by to say "hello" and to see if I was happy. YES, I am happy with the work! The furnace is very quiet. I have it running on low just to circulate the air in the house and it's so much quieter than my old furnace. When I need new duct work for an upcoming basement renovation TwinTech will be my first choice. I highly recommend TwinTech. PS. They were even nice to my dogs.

by Les G. from Pickering on Twintech Heating and Cooling

Greg was prompt on the scheduled day of installation and the work was done well within the time estimated beforehand. Installation was neat and the equipment and scope of work was as specified in the quote. One item I must point out is that we were faced with a "No Heat" situation the day before the scheduled installation and Greg came out to address it free of charge. Not only that, but he also corrected an installation fault with our smart thermostat that was not part of the original job, again free of charge.

by one19 in North york on Twintech Heating and Cooling

Greg came by to do a routine furnace checkup. He was very knowledgeable and professional, letting me know what's being checked/adjusted and giving me tips to ensure everything runs smooth. Very honest and upfront about what's working fine vs. what may need to be fixed/replaced. He didn't attempt to up sell anything that wasn't necessary. I'm glad to have finally found someone I can trust and rely on for all my HVAC needs - furnace, A/C, and hot water tank.

by Paul M. from Toronto on Twintech Heating and Cooling

I'm very happy with the work that was done. Everyone from salesperson to the installers were friendly and professional. They were on time and cleaned up the job site after it was installed. They also answered all my follow up questions promptly. I wouldn't hesitate to work with them or recommend them again.

by Kathy D.in Ajax on Twintech Heating and Cooling

Thanks to the team at Twin Tech for a great job installing my new heat pump/ac unit. The guys were very polite and professional. When they left you would never have known they had been there except for the new Mitsubishi unit on the wall!! would highly recommend the Twin Tech team.

by varga p. in Pickering on Twintech Heating and Cooling

Installed professionally, no delays, no rework needed. Very reliable contractor and sales person. Also installed BBQ gas line and some duct work.

by Private User on Twintech Heating and Cooling

Greg and Grant are friendly, reliable, and knowledgeable HVAC professionals. The twins, Dave and the entire team provided efficient top quality service. Our family plns to use Twintech for all of our future HVAC needs.

by peter in Whitby on Twintech Heating and Cooling

Very impressed with this company. They show up on time , kept my place clean and after they left it looks like they were never there. Very professional team. Those people know what they doing . Their installation was on the highest standard. They are very knowledgeable especially they're worker Peter. I strongly recommend this company to everybody. After the installation I receive the call making sure I'm satisfied with their products and their job. Bravo!!!

by James in Bowmanville on Twintech Heating and Cooling

Greg and his brother were referred to us by a friend. They arrived when they said they would, did an exceptional job and left the place as tidy or tidier then they found it. Their professionalism is only surpassed by their kind and friendly demeanor. Even after several calls to help me with my high tech thermostat I feel that I could always call with any concern (No one responds to my texts as quickly as Greg) and have a friendly helpful response. I found out their grandfather started the company and now as a 3rd generation company, they are doing their grandfather proud. I would highly recommend Twintech over any other hvac company out there.

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See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

by Anna Chin on Twintech Heating and Cooling

Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!

by Connor Agnew on Twintech Heating and Cooling

Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.

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