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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:
Apr 28, 2022
I left a live chat message on their website that my air conditioning was not working. Within 1hr a representative called me to discuss my options.
The next day he came to the house to review my needs and give me a price for a new system. Price quoted was less than I expected and the installation was completed the following day. I found their salesman and the installers very knowledgeable and easy to deal with. All my questions were answered. Everything was properly explained in regards to what unit was needed and why, along with instruction where needed for use.
The installers made sure everything was working properly before they left.
Apr 28, 2022
This is to thank Twintech Heating and Cooling for their exceptional and timely service. Mitch, their technician was very courteous and generous with his time right from his first meeting with us. He not only took the time to check everything but also educated us on why we needed what he recommended. Greg and Mitch graciously accommodated us on our requested day and time for job to be done. They were both very courteous and responsive to our needs and special requests especially in a tight spot. The job was finished neatly and on time. Thank you Twintech for your great service !
Apr 28, 2022
They came the day and time they had planned for us and were very fast and efficient! The AC works amazing and it is amazing during the heat of the summer we have already got! Thanks for everything you did for us!
Apr 28, 2022
Would recommend this company to friends and family in a heartbeat. Very professional , on time and left no mess when the job was done.
Apr 28, 2022
Great customer service. Responsive and professional. I would highly recommend Twintech, I used them previously for repair service and a new air conditioner- very satisfied.
Apr 5, 2022
Our air conditioner failed. Made a call and within 15 min a technician was at our door.
The issue was fixed and many suggestions were provided.
Thanks to Mitch. Great service !
Apr 5, 2022
Our furnace was rattling, as soon as we put our air conditioner on this past week. We had researched looking for a company that was Registered with Better Business Bureau, and this company TwinTech, had A+ Rating. Scott, was immediately helpful via text/phone and sent his technician as soon as he was able...Mitchell/technician provided great professional service. Thank you TwinTech.
Sean and Debbie
Apr 5, 2022
I contacted various companies when looking to install a new furnace and I found Twintech to be transparent with their communication and approach. They had options to suit my various requirements and the price vs quality was very good. The after installation communication was also very good and they answered all queries I had.
Apr 5, 2022
My furnace broke down last month. The team was quick to respond, courteous, professional and mindful of COVID-19 concerns. I highly recommend them if you are considering replacing or servicing your HVAC equipment.
Apr 5, 2022
I was very happy with the installation and price. I would definitely recommend. Thank you Twintech.
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