Is your wall heater pilot light repeatedly going out, leaving you without heat? A faulty pilot light can be frustrating and concerning, but the issue is usually easy to diagnose and repair.
If you’re short on time, here’s a quick answer to your question: The most common reasons for a pilot light to keep going out are a weak flame, dirt or soot buildup, a faulty thermocouple or thermopile, or a draft in the vent pipes.
Checking and cleaning these components is often all that’s needed to restore a working pilot light.
In this comprehensive article, we’ll discuss the role of the pilot light, explain the most common reasons it goes out again and again, and provide steps to troubleshoot and fix the problem for good.
What is the Pilot Light and What Does it Do?
The pilot light is a small flame that is continuously burning in gas-powered appliances such as wall heaters. It serves as an ignition source for the main burner and ensures that the heater can quickly and reliably heat up when needed.
Provides the Ignition Source for the Main Burner
The primary function of the pilot light is to provide the ignition source for the main burner. When you turn on your wall heater, gas is released into the combustion chamber. The pilot light then ignites this gas, creating a larger flame that heats up the air passing through the heater’s heat exchanger.
Once the air is heated, it is distributed throughout the room, warming up the space.
The pilot light is designed to stay lit at all times, even when the main burner is not in use. This ensures that the heater can quickly and easily ignite when you need it, without having to wait for a spark or other ignition method.
Produces a Small Flame that Heats the Thermocouple
In addition to providing the ignition source for the main burner, the pilot light also heats up a component called the thermocouple. The thermocouple is a safety device that detects whether the pilot light is lit or not.
If the pilot light goes out, the thermocouple senses the change in temperature and shuts off the gas supply to prevent any potential gas leaks.
When the pilot light is lit, the heat from the flame generates a small electrical current in the thermocouple. This current keeps a valve open, allowing gas to flow to the pilot light. If the pilot light goes out, the current stops, and the valve closes, cutting off the gas supply.
So, the pilot light not only serves as the ignition source but also acts as a safety mechanism to prevent gas leaks in case the flame goes out.
For more information about the pilot light and how it works, you can visit www.hometips.com.
6 Common Reasons Why the Pilot Light Keeps Going Out
Weak Pilot Flame
One common reason why the pilot light on your wall heater keeps going out is due to a weak pilot flame. If the flame is not strong enough, it may struggle to stay lit, especially in drafty areas. Check to see if the flame is blue and stable.
If it is weak or flickering, you may need to adjust the gas pressure or clean the pilot assembly. It’s best to consult a professional technician for this task to ensure it is done safely and correctly.
Dirt or Soot Buildup
Dirt or soot buildup can also cause the pilot light to go out repeatedly. Over time, dust, debris, and dirt can accumulate in the pilot assembly, obstructing the flame and preventing it from staying lit. Regularly cleaning the pilot assembly can help prevent this issue.
Use a soft brush or compressed air to remove any buildup and ensure the flame has enough oxygen to burn properly.
Faulty Thermocouple
A faulty thermocouple is another common culprit for a pilot light that keeps going out. The thermocouple is a safety device that senses the heat from the pilot flame and sends a signal to the gas valve to keep the gas flowing.
If the thermocouple is malfunctioning or damaged, it may not be able to generate enough voltage to keep the gas valve open, causing the pilot light to go out. In this case, replacing the thermocouple should solve the issue.
Faulty Thermopile
Similar to the thermocouple, a faulty thermopile can also result in a pilot light that won’t stay lit. The thermopile is responsible for generating electricity to power the gas valve. If it is defective or worn out, it may not produce enough voltage to keep the gas valve open, causing the pilot light to go out.
Replacing the thermopile is typically the solution in this scenario.
Drafts in the Vent Pipes
Drafts in the vent pipes can disrupt the flow of combustion air, causing the pilot light to go out. These drafts can be caused by improper installation, cracks or gaps in the vent pipes, or external factors such as wind.
Inspecting the vent pipes for any damage or obstructions and properly sealing any gaps can help prevent drafts and keep the pilot light lit consistently.
Moisture Buildup
Moisture buildup can also be a reason why your pilot light keeps going out. Excessive moisture in the air can affect the flame’s stability and cause it to extinguish. This can be particularly problematic in humid environments or if there is a water leak near the heater.
Addressing any moisture issues in the area, such as fixing leaks or using a dehumidifier, can help prevent the pilot light from going out due to moisture-related problems.
Remember, if you are unsure about troubleshooting or fixing the issue yourself, it’s always best to seek the assistance of a qualified technician. They have the knowledge and experience to diagnose and repair the problem safely and efficiently.
How to Troubleshoot and Fix a Faulty Pilot Light
Step 1: Clean the Pilot Assembly
If your pilot light keeps going out on your wall heater, one possible reason is that the pilot assembly may be dirty or clogged. Over time, dust and debris can accumulate in the pilot assembly, hindering the flow of gas. To fix this issue, you can follow these steps:
- Turn off the gas supply to the heater.
- Remove the access panel to gain access to the pilot assembly.
- Use a soft brush or compressed air to carefully clean the pilot assembly and remove any dirt or debris.
- Once clean, put the access panel back in place and turn on the gas supply.
Step 2: Check the Thermocouple and Thermopile
The thermocouple and thermopile are safety devices that detect whether the pilot light is lit. If they are not functioning properly, the pilot light may keep going out. Here’s how you can check these components:
- Locate the thermocouple and thermopile near the pilot assembly.
- Inspect them for any signs of damage or corrosion.
- If they appear to be in good condition, use a multimeter to test their functionality.
- If either the thermocouple or thermopile is faulty, it may need to be replaced.
Step 3: Inspect the Burner and Flame
A dirty or misaligned burner can also cause the pilot light to go out frequently. To ensure the burner is in proper working condition:
- Turn off the gas supply to the heater.
- Remove the burner assembly and inspect it for any debris or blockages.
- Clean the burner thoroughly and remove any obstructions.
- Inspect the flame when the pilot light is lit. It should be a steady blue flame. If the flame is yellow or flickering, it may indicate a problem with the gas mixture or airflow.
- If the burner is damaged or the flame is not as it should be, it may be necessary to replace the burner or adjust the gas mixture.
Step 4: Test for Drafts
Drafts near the wall heater can cause the pilot light to go out. Check for any drafts in the room by:
- Ensuring all windows and doors are closed.
- Sealing any cracks or gaps around windows and doors.
- Using weatherstripping or draft stoppers to prevent drafts.
By eliminating drafts, you can help stabilize the pilot light and prevent it from going out unexpectedly.
Step 5: Replace Damaged Parts
If you have gone through the previous steps and the pilot light still keeps going out, it may be necessary to replace certain parts. Faulty components such as the gas valve or the pilot orifice can cause recurring issues.
In such cases, it is recommended to consult a professional technician or contact the manufacturer for assistance.
Remember, if you are unsure or uncomfortable performing any of these steps, it’s always best to seek professional help to ensure the safety and proper functioning of your wall heater.
When to Call a Professional
While some pilot light issues can be resolved with a few simple troubleshooting steps, there are situations where it is best to call a professional. Here are some instances when contacting a professional is recommended:
1. Persistent Pilot Light Problems
If you find that your pilot light keeps going out repeatedly despite your best efforts to relight it, it may be a sign of a more serious underlying issue. A professional HVAC technician will have the knowledge and experience to diagnose and fix the problem properly.
2. Gas Leaks
Gas leaks are a serious safety concern and should never be taken lightly. If you smell gas near your wall heater or suspect a gas leak, immediately turn off the gas supply and evacuate the premises. Contact your gas company and a professional technician to inspect and repair the issue.
Gas leaks can be extremely dangerous and require the expertise of a licensed professional.
3. Complex Repairs
Some pilot light issues may require complex repairs or replacements of certain components of your wall heater. This could involve working with electrical circuits, gas lines, or other technical aspects that should only be handled by a trained professional.
Attempting to fix these issues on your own can lead to further damage or even personal injury.
4. Manufacturer’s Warranty
If your wall heater is still under warranty, attempting to repair it yourself may void the manufacturer’s warranty. It is always best to consult with a professional technician who can perform the necessary repairs while ensuring that your warranty remains intact.
Remember that safety should always be your top priority. If you are unsure about how to handle a pilot light issue or if you have any concerns about your wall heater, it is best to seek professional assistance.
A qualified HVAC technician will be able to provide you with the appropriate guidance and ensure that your wall heater is functioning safely and efficiently.
Preventing Future Pilot Light Problems
Experiencing pilot light issues with your wall heater can be frustrating and inconvenient. To prevent future problems and ensure that your pilot light stays lit, there are a few important steps you can take.
Keep the Pilot Assembly Clean
Regularly cleaning the pilot assembly is essential for maintaining a reliable and consistent flame. Over time, dust, dirt, and debris can accumulate around the pilot light, causing it to go out more frequently.
To clean the assembly, you can use a soft brush or compressed air to gently remove any build-up. This simple maintenance task can go a long way in preventing pilot light issues.
Have Your Heater Serviced Annually
Having your wall heater professionally serviced on an annual basis is another effective way to prevent pilot light problems. During a service appointment, a qualified technician will inspect and clean the entire heating system, including the pilot light and gas lines.
They can also identify any potential issues before they become major problems, saving you time, money, and frustration in the long run.
Additionally, regular servicing helps ensure that your heater operates at peak efficiency, reducing energy consumption and extending the lifespan of the unit. It is recommended to schedule a service appointment before the start of the heating season to make sure everything is in proper working order.
Use a Protective Cover Outdoors
If you have an outdoor wall heater with a pilot light, using a protective cover can help prevent pilot light issues caused by weather conditions. Rain, snow, and strong winds can extinguish the flame, leading to frequent relighting.
A cover specifically designed for outdoor heaters can provide a barrier against the elements, keeping the pilot light protected and reducing the chances of it going out.
When using a cover, ensure that it is made of a durable and weather-resistant material, and that it fits securely over the heater. It is also important to follow the manufacturer’s instructions for installation and use.
By following these preventative measures, you can reduce the likelihood of pilot light problems on your wall heater and enjoy a consistently warm and comfortable space.
Conclusion
A pilot light that repeatedly goes out can be a nuisance, but a bit of troubleshooting and maintenance can usually solve the problem. With a clean pilot assembly, operational thermocouple, properly adjusted flame, and no drafts, your pilot light should maintain a small, steady flame to reliably ignite the main burner as needed.
By understanding the most common issues, inspecting key components, and making minor repairs, you can often get your wall heater pilot light working properly again. If problems persist, call a professional for service.
With the right care, your pilot light can keep your home comfortably heated for years to come.
