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A Simple Guide to Furnace Ignition Failure
Posted On: November 4, 2024
Here’s a straightforward guide to help you troubleshoot furnace ignition failure, a common issue that can lead to a cold house in the winter. Furnace ignition failure can have multiple causes, and identifying them early can save time, energy, and repair costs.
1. Check the Thermostat
- Ensure it’s set to “Heat”: The thermostat should be set to “heat” and at a temperature higher than the current room temperature.
- Inspect the Batteries: Some thermostats use batteries, so replace them if necessary. This could resolve the issue without further troubleshooting.
2. Inspect the Air Filter
- Replace Dirty Filters: A dirty air filter can restrict airflow, causing the furnace to overheat and shut down as a safety precaution. A fresh filter can allow your furnace to work efficiently and prevent ignition issues.
3. Look for Power Issues
- Circuit Breaker: Check the furnace’s circuit breaker in your electrical panel. If it’s tripped, reset it once. If it trips again, you may have a larger electrical issue that requires a professional.
- Furnace Switch: Make sure the power switch, which usually looks like a light switch near the furnace, is in the “on” position.
4. Verify Gas Supply
- Gas Valve: If you have a gas furnace, check that the gas valve near the furnace is open. The lever should be parallel to the gas line when it’s open.
- Gas Line and Supply: Sometimes, the gas company may have shut off the supply for maintenance. If you suspect an issue with gas flow, contact your gas provider.
5. Inspect the Igniter
- Hot Surface Igniter: Many modern furnaces use an electric igniter, which can fail over time. A visible crack or wear on the igniter usually indicates it needs replacement. This repair often requires professional assistance.
- Pilot Light: For furnaces with a pilot light, check that it’s lit. If not, relight it if you feel comfortable, or call a technician if you have trouble with it.
6. Examine the Flame Sensor
- Clean the Flame Sensor: Over time, the flame sensor can become dirty, which prevents it from sensing the flame. Use a fine-grit sandpaper or a cloth to gently clean the sensor. This can often restore normal furnace function.
7. Check for Error Codes
- Error Lights: Most modern furnaces have a diagnostic light that flashes in a particular pattern if there’s an issue. Refer to the furnace manual to interpret these error codes, which can help pinpoint the problem.
8. Assess the Blower Motor and Vents
- Vent Blockages: Ensure nothing blocks air vents and ducts. Restricted airflow can also cause safety switches to trigger.
- Blower Motor Reset: Some furnaces have a reset button on the blower motor. Press this if your furnace isn’t responding.
When to Call a Professional
If these steps don’t resolve the issue, it’s best to contact a licensed HVAC technician. Attempting to fix more complex problems on your own can be unsafe and may lead to further damage.
Following these steps can often solve simple ignition issues and get your furnace running smoothly again!
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See What Our Customers Are Saying:
Aug 23, 2022
It was a refreshing experience interacting with the Twintech team. From Bob, the sales consultant, who articulated in layman's terms all the options available and reasons for making any selection. This was done without the prevailing pressure tactics so commonplace today.
Before proceeding Mitch, the technician, at our request conducted a service check on our 30 yr old furnace. His report was positive indicating no urgency to replace it. Again no pressure tactics.
Three days after first meeting with Bob, the installation team of Greg and
Spencer completed the installation within the planned time frame.
A very professional, courteous and transparent team which delivered on their promise. I highly recommend Twintech.
Aug 22, 2022
Initial contact with sales resulted in an immediate response, which led to a timely installation. Both sales and installers were all very professional. I have no hesitation in recommending TWINTECH.
Aug 21, 2022
I had a great experience with TwinTech. The company offered a reasonable quote, and performed a quick and clean installation. The installer Greg was experienced, professional and courteous. He explained the services he performed and gave recommendations on maintain the new furnace.
The salesman Bob was honest
and professional and educated me on how to achieve optimal performance.
All communication from them was quick and they came the following day. I was pleased with the service and would recommend them.
Aug 20, 2022
From quote, to installation, to follow up, Twintech provided excellent service. I would highly recommended their services.
Aug 19, 2022
I had a really great experience with these guys. The salesman Bob was clearly very knowledgeable about everything to do with heating and cooling a home, spent a lot of time with us going over the details of the job, never rushed us and came back after the install to make sure we were happy. The installation crew was excellent, they covered the floors all the way from outside down to the basement furnace room, kept the place clean, got the work done on time and were very friendly. Ive got 15 years in the contracting/ construction industry and these guys are one of the most professional companys Ive dealt with. Great company!
Aug 18, 2022
Had great service and clean-up was good. Was happy with my salesman. They were very friendly and helpful. I needed a new furnace as our was over 20 years old. The furnace and air-conditioner work great and they are very quiet. I am very pleased with the service and product I received.
Aug 17, 2022
Met with Dave for the sales process and he was great about explaining and going over everything to us. The install happened very quickly and the team were super professional and friendly. We are very happy with this company and their services and we definitely recommend them to others. Thankful my sister recommended them to me!
Aug 16, 2022
Reviews for Twintech were good, and they did not disappoint. After an initial visit to discuss the suitable AC unit for replacement, an installation date was available in just a couple of days, and everything was installed without a hitch. Highly recommended
Aug 16, 2022
Very pleased with the installation of our new furnace and A/C unit. From quotation stage to the completion of the job Twintech was very professional.
Thank you for a job well done.
Aug 15, 2022
My old water heater quit on me. I called TwinTech. In less than 4 days, I had my new water heater installed and the old one taken away. The whole process was quick, easy, pleasant, and well done. This is the third time I've dealt with TwinTech and I've been satisfied each time.
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