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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 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
Jul 23, 2024
Twintech Heating & Cooling installed my furnace in 2022 and in fall of 2023 installed my Panasonic Heat Pump. Greg and Mitch did a great job. Helped me through the rebate process. Super happy with the Heat Pump. Only used my furnace 5 times this winter. Energy bills lower, carbon emissions lower.Thank you Twintech. I recommend highly!
Jul 18, 2024
Just had a new furnace installed by Twintech. I cant express how great these guys are at what they do. From the sales to installation they were professional all the way. Very reasonable pricing and courteous during the installation and willing to answer any questions I had. Highly recommended !!!
Jul 17, 2024
They've cleaned my furnace a couple of times and mentioned that the hot water tank standards were going to change soon so I decided to change mine out.
There were a few challenges during the process but the installers handled the problems without missing a stride! I now have really hot water again!
Jul 16, 2024
Highly recommend Twintech Heating company, we got honest and detailed information on what was needed to replace and install a new gas furnace. Bob and Greg made us feel comfortable withe process through their thorough explanation and knowledge of the right furnace for our needs. The professionalism and courteous friendly attitude towards the customer is what we liked the most as they treated us like family. So happy with our decision and new furnace we will be looking into get our rental water heater replaced and installed by Twintech team. We feel better having their knowledge on our side and will only trust them with any further maintenance of furnace.
Jul 15, 2024
Customer service and knowledge is priority in this industry, and Twintech has it. I've dealt with their team for maintenance and a furnace replacement. They're accommodating and make great recommendations, and came through at a great price over the big guys in the industry. They'll be my next call when I need service or maintenance.
Jul 14, 2024
I decided that the noises and age of the existing furnace which was old and not very efficient to replace it. Gave Greg a call and Grant and Greg got to work on it. Because of supply issues with the current heating type that would be an easier install Greg convinced me to change the location of the system and it would provide me better service for heat and efficiency. I had skeptical but went ahead anyway putting trust in Greg And Grant. Greg, Grant and Mitch came through and in 2 days had completely relocated my heating and A/C system. I can honestly say Greg was right my old house has been warmer and more evenly heated as it ever was. For anyone reading this rather long winded review can take my word for it, Twin Tech can take care of your needs.
Jul 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
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