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Furnace Ignition Failure
Posted On: September 22, 2024
Furnace ignition failure is a common issue that can prevent your heating system from working properly. There are several potential causes for this problem, and understanding them can help diagnose and resolve the issue efficiently. Here are some of the common reasons for furnace ignition failure:
1. Dirty or Faulty Igniter
The igniter is responsible for lighting the gas in your furnace. Over time, it can become dirty or wear out, preventing the furnace from igniting. Cleaning or replacing the igniter might be necessary.
2. Clogged Air Filter
A dirty air filter restricts airflow to the furnace, causing it to overheat and shut down. This can lead to ignition failure if the furnace overheats before ignition can take place.
3. Gas Supply Issues
If there's a problem with the gas supply, such as a closed valve, low pressure, or a malfunctioning gas line, the furnace won’t ignite. Ensuring that gas is flowing to the furnace is crucial.
4. Faulty Flame Sensor
The flame sensor detects whether the furnace's burner is lit. If it is dirty or defective, the sensor may shut down the furnace as a safety precaution, preventing ignition.
5. Malfunctioning Thermostat
If the thermostat is not communicating properly with the furnace, it might not signal the furnace to start the ignition process. Checking and recalibrating or replacing the thermostat can resolve this issue.
6. Tripped Circuit Breaker
A furnace requires power to ignite. If the circuit breaker has tripped, the furnace won’t receive the necessary power, leading to ignition failure.
7. Blocked Vents or Chimney
Blockages in the exhaust system, including the vents or chimney, can cause ignition issues because the furnace needs proper airflow for combustion. Clearing any obstructions can resolve this.
8. Pilot Light Issues (Older Furnaces)
In older furnace models with a pilot light, if the pilot goes out or is weak, the furnace won’t ignite. Reigniting the pilot or adjusting it might be necessary.
9. Control Board Problems
The control board is the furnace’s “brain,” managing various functions, including ignition. A malfunctioning control board may fail to initiate the ignition process.
Solutions for Ignition Failure:
- Check the air filter and replace if dirty.
- Ensure that the gas valve is open and the supply is normal.
- Clean the flame sensor and igniter if they are dirty.
- Reset the circuit breaker if it’s tripped.
- Inspect the thermostat to ensure it’s working correctly.
In most cases, if the issue persists, it’s best to contact a professional HVAC technician for repair. They will be able to diagnose and fix any deeper issues causing the furnace to fail ignition.
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See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
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.
Feb 18, 2025
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!
Feb 18, 2025
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!
Feb 18, 2025
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!
Feb 18, 2025
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.
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!!
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