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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:
Jan 1, 2015
Really nice honest guys. It was a pleasure to do business with a company that does exactly what they say theyre going to do! My basement was cleaner after they installed my new furnace and AC. Thanks again Greg and Grant and for doing such a great job.
Jan 1, 2015
5 star service!! I had twin tech install a high efficiency furnace and hot water tank at my home. I am taking time to write this review as a thanks for what I viewed as next level service that went above and beyond. Prior to installation they explained my specific options without pushy sales tactics and up front costs. Greg and Grant replaced a large portion of the duct work (built in their own shop) that had rusted over the years which resulted in a great looking job. It was a pleasure to work with people are passionate and take pride in their work. Following the installation they explained all aspects and maintenance of the new equipment. Products have worked flawlessly. Thanks again Greg and Grant! Highly recommend!!
Jan 1, 2015
Twin Tech was great; they were honest, reliable and very thorough. I would recommend their services and will definitely be using them in the future.
Jan 1, 2015
Hi Dave, Thank You Dave for coming to my aid this past summer when my AC quit. Your men did a great job installing and cleaning the area. The unit is working very well and i would highly recommend your company TwinTech. Dave you delivered what you sold and i truly appreciate it.
Jan 1, 2015
My experience with TWINTECH has been excellent, start to finish. While doing market research I made a list of several local companies and called them for some high-level information. Dave was the first to call me back, and the only one to book a meeting to see my place in order to give an informed, accurate estimate. He reviewed the different AC makes and models with me, explained the technology, and made a recommendation appropriate to my home. The installation went smoothly. I had one post-installation issue there was moderate noise/vibrations coming from the duct system. I called about this, booked an appointment, and the technician resolved the issue during the service call. I feel assured having a 10-year warranty on parts & labour. I would recommend TWINTECH to anyone considering an AC or furnace for their home. Regards,
Jan 1, 2015
Thank you for your attention to detail regarding my purchase of a new air conditioner. Twintech arrived at the appointed time and were totally professional on the installation process completing the job quickly. PS thanks for the assistance applying for the government rebate
Jan 1, 2015
Dave and the guys from Twintech did a great job of installing my AC. They came on time did a nice neat job and cleaned up after themselves! Do not waste your time call Twintech first.
Jan 1, 2015
My AC unit was not working at all and our furnace that was still working but not giving us any trouble was over 15 years old. So I had 3 heating companies come out to give us a quote on replacing both the AC and the furnace at the same time. Two companies right away recommended that I replace both units simply because they were old. Dave from twintech however suggested that we save some money and replace the AC only because it seemed to him that the furnace was still in great shape and was running fine. He told us that he would have his technicians inspect the furnace thoroughly when they had it apart to install the AC. My husband was at home when the furnace was apart and was very impressed when the tech took him downstairs to personally show him that the furnace was in excellent working condition. He also cleaned the furnace at no extra charge. So now I have an honest heating and AC company that I can highly recommend to other home owners. Great job Thank You!
Jan 1, 2015
I had made the decision to replace my furnace and AC earlier this year. After meeting with several HVAC contractors I decided to go with Dave and his company. Dave was on time, polite, friendly and very professional. He took the time to answer all my questions and to explain the scope of work that would be required to do the job. The technicians arrived on time did a professional installation and completed the job on schedule. They respected my home by putting down vinyl runners to protect my floors and did a very thorough clean up. Im very pleased with my decision to go with Dave and his team. I would highly recommend them to anyone who is considering upgrading their furnace and air conditioner.
Jan 1, 2015
I have no problem in recommending Dave and the TWINTECH team to any home owner who is looking for quality heating and AC products and expert service.
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