Understanding and Troubleshooting Furnace Burner Lights Then Goes Out
If your furnace's burner lights up only to go out shortly after, you're likely dealing with a common issue that can be resolved with some troubleshooting. This problem can be caused by a variety of factors, ranging from simple to complex. Let's delve into the possible causes and solutions for this furnace issue.
Understanding the Furnace Ignition Process
Before we dive into the troubleshooting process, it's essential to understand how your furnace's ignition system works. Modern furnaces use an ignition system to light the burners. This system can be either an intermittent pilot ignition (IPI) or a hot surface ignition (HSI). In both systems, the burner should stay lit as long as the furnace is running. If it doesn't, there's likely an issue that needs to be addressed.
Common Causes and Solutions
Several factors can cause your furnace's burner to light then go out. Here are some of the most common causes and their respective solutions:
- Dirty or Clogged Burners: Over time, dust and debris can accumulate on the burners, preventing them from staying lit. To clean the burners, first, turn off the power to the furnace. Then, use a soft brush to gently remove the debris. If the burners are severely clogged, you may need to replace them.
- Faulty Ignition Sensor: The ignition sensor is responsible for sending a signal to the furnace to light the burners. If this sensor is faulty, it may cause the burners to light briefly before going out. Replacing the ignition sensor should resolve this issue.
- Low Gas Pressure: If the gas pressure in your home is too low, it can cause the burners to light briefly before the flame goes out. This issue is typically caused by a problem with your gas supply, such as a leak or a closed valve. If you suspect this is the case, contact your gas company immediately.
- Faulty Control Board: The control board is the brain of your furnace. If it's faulty, it may cause the burners to light briefly before going out. Replacing the control board should resolve this issue.
- Draft Inducer Motor: The draft inducer motor is responsible for pulling combustion gases out of the furnace. If this motor is faulty, it can cause the burners to light briefly before going out. Replacing the motor should resolve this issue.
When to Call a Professional
While some furnace issues can be resolved with DIY troubleshooting, others require the expertise of a professional. If you've tried the solutions above and your furnace's burner is still lighting then going out, it's time to call a professional HVAC technician. They have the training and equipment necessary to diagnose and repair complex furnace issues.
Preventative Maintenance
Regular preventative maintenance can help prevent furnace issues, including burners that light then go out. We recommend scheduling annual maintenance for your furnace. During this maintenance, a technician will clean and inspect your furnace, addressing any potential issues before they become major problems.
In addition to regular maintenance, there are several steps you can take to keep your furnace running smoothly. These include changing the air filter regularly, ensuring proper ventilation, and keeping the area around your furnace clear of debris.
Frequently Asked Questions
| Question | Answer |
|---|---|
| Why does my furnace's burner keep going out? | This issue can be caused by a variety of factors, including dirty burners, a faulty ignition sensor, low gas pressure, a faulty control board, or a faulty draft inducer motor. |
| How do I clean my furnace's burners? | First, turn off the power to the furnace. Then, use a soft brush to gently remove any debris from the burners. |
| When should I call a professional for furnace repairs? | If you've tried DIY troubleshooting and your furnace's burner is still lighting then going out, it's time to call a professional HVAC technician. |
