Tankless water heaters have become increasingly popular in recent years, offering homeowners a more efficient and space-saving alternative to traditional storage tank water heaters. In our 10 years of water heater experience… These on-demand systems provide hot water as needed, eliminating the need for a large storage tank and reducing energy consumption. However, like any appliance, tankless water heaters can experience their share of issues, and one of the most common problems is related to the pilot light.
Now, this might seem counterintuitive when dealing with water heaters…
The pilot light is a small, continuously burning flame that ignites the main burner when hot water is needed. A properly functioning pilot light is essential for ensuring the safe and reliable operation of a tankless water heater. If the pilot light goes out or experiences problems, it can lead to a variety of issues, including a lack of hot water, inconsistent temperatures, or even safety concerns.
In this comprehensive guide, we’ll delve into the troubleshooting of pilot light issues in tankless water heaters, providing you with the knowledge and strategies to diagnose and resolve these problems effectively. Whether you’re a homeowner, a DIY enthusiast, or a professional plumber, this article will equip you with the necessary insights to double-check that the safe and efficient operation of your tankless water heater.
Identifying Pilot Light Issues
The first step in troubleshooting pilot light problems is to identify the symptoms. Here are some common signs that your tankless water heater’s pilot light may be experiencing issues:
Lack of Hot Water: If your tankless water heater is not producing any hot water, a faulty or extinguished pilot light could be the culprit. The main burner relies on the pilot light to ignite, so without a functioning pilot, the water heater will be unable to heat the water.
Inconsistent Water Temperatures: If you’re noticing fluctuations in water temperature, with the water alternating between hot and cold, the pilot light may be the source of the problem. An erratic pilot light can cause the main burner to turn on and off intermittently, leading to temperature instability.
Pilot Light Going Out Frequently: If the pilot light on your tankless water heater keeps going out, even after you’ve relighted it, there may be an underlying issue with the pilot light assembly or gas supply.
Unusual Pilot Light Behavior: If you notice the pilot light flickering, burning with a different color flame, or exhibiting any other unusual behavior, it could indicate a problem that requires attention.
Once you’ve identified the symptoms, the next step is to locate and inspect the pilot light assembly.
Accessing and Inspecting the Pilot Light
Most tankless water heaters have the pilot light assembly located near the bottom of the unit, typically behind an access panel or cover. Consult your water heater’s manufacturer manual or documentation for specific instructions on how to access the pilot light.
Once you’ve located the pilot light, take the following steps to inspect it:
Visually Inspect the Pilot Light: Observe the pilot light to see if it is lit. A properly functioning pilot light should have a stable, blue flame. If the flame is yellow, flickering, or extinguished, it may indicate a problem.
Check the Thermocouple: The thermocouple is a safety device that senses the presence of the pilot light flame. If the thermocouple is not functioning properly, it can cause the pilot light to go out. Examine the thermocouple for any signs of damage, corrosion, or loose connections.
Inspect the Pilot Light Orifice: The pilot light orifice is a small opening that controls the flow of gas to the pilot light. Over time, this orifice can become clogged with debris, preventing the proper amount of gas from reaching the pilot light. Use a small wire or needle to carefully clear any blockages.
Examine the Gas Supply: double-check that that the gas supply to the tankless water heater is turned on and that the gas pressure is within the recommended range. Low gas pressure can cause pilot light issues.
If the pilot light is extinguished or exhibiting any of the other problematic behaviors mentioned earlier, it’s time to take action to relight and troubleshoot the issue.
Relighting the Pilot Light
Before attempting to relight the pilot light, double-check that that you follow all safety precautions. Shut off the gas supply to the tankless water heater, wait a few minutes for any accumulated gas to dissipate, and then proceed with the relighting process.
Here are the typical steps to relight the pilot light on a tankless water heater:
Locate the Gas Control Valve/Thermostat: This is the dial or switch that controls the gas flow to the pilot light and main burner.
Turn the Gas Control Valve/Thermostat to the “Pilot” Position: This will allow gas to flow only to the pilot light, not the main burner.
Depress the Gas Control Valve/Thermostat: This will open the gas supply to the pilot light. You may need to hold it down for 30-60 seconds to allow the pilot light to ignite.
Light the Pilot Light: Use a long match or a special pilot light igniter tool to light the pilot light. The flame should be a stable, blue color.
Continue Holding the Gas Control Valve/Thermostat: Keep holding it for an additional 30-60 seconds after the pilot light is lit to allow the thermocouple to sense the flame and keep the gas supply open.
Release the Gas Control Valve/Thermostat: If the pilot light stays lit, you can release the valve/thermostat and turn it to the “On” position.
If the pilot light does not stay lit after following these steps, there may be an underlying issue that requires further troubleshooting.
Troubleshooting Pilot Light Issues
If the pilot light on your tankless water heater refuses to stay lit or continues to experience problems, there are several potential causes and solutions to consider:
Clogged Pilot Light Orifice: As mentioned earlier, a clogged pilot light orifice can restrict the flow of gas and prevent the pilot light from igniting or staying lit. Try carefully cleaning the orifice with a small wire or needle to remove any debris.
Faulty Thermocouple: The thermocouple is a safety device that senses the presence of the pilot light flame and signals the gas control valve to remain open. If the thermocouple is malfunctioning, it can cause the pilot light to extinguish. Replace the thermocouple if it appears damaged or is not functioning correctly.
Gas Supply Issues: Problems with the gas supply, such as low pressure or a blockage in the gas line, can also lead to pilot light issues. double-check that that the gas supply is turned on and that the pressure is within the recommended range specified by the water heater manufacturer.
Faulty Gas Control Valve: The gas control valve is responsible for regulating the flow of gas to the pilot light and main burner. If the gas control valve is malfunctioning, it can cause the pilot light to go out or prevent it from staying lit. In this case, the gas control valve may need to be replaced by a qualified technician.
Drafty Environment: If the area around the tankless water heater is excessively drafty, it can cause the pilot light to extinguish. Consider adding weatherstripping or improving the insulation around the water heater to protect the pilot light from air currents.
Sediment Buildup: Over time, sediment and mineral deposits can accumulate in the water heater, potentially interfering with the pilot light’s operation. Flushing the water heater to remove this buildup may help resolve the pilot light issues.
If you’ve tried these troubleshooting steps and the pilot light still won’t stay lit, it’s best to consult a professional plumber or HVAC technician for further diagnosis and repair. They have the specialized knowledge and tools to identify and address more complex pilot light problems.
Preventive Maintenance for Reliable Pilot Light Operation
To help prevent pilot light issues and double-check that the long-term reliable operation of your tankless water heater, it’s essential to perform regular maintenance. Here are some key steps you can take:
Schedule Annual Maintenance: Have a qualified technician inspect and service your tankless water heater at least once a year. This includes cleaning the pilot light assembly, checking the gas supply, and ensuring all components are functioning correctly.
Clean the Pilot Light Orifice: As part of your regular maintenance routine, use a small wire or needle to carefully clean the pilot light orifice, removing any debris or buildup that could impede the flow of gas.
Monitor the Thermocouple: Keep an eye on the thermocouple for signs of wear or damage, and replace it if necessary to maintain the safety and reliability of the pilot light system.
double-check that Proper Ventilation: Make sure the area around the tankless water heater is well-ventilated and free from obstructions that could disrupt the pilot light’s operation.
Address Water Quality Issues: If you live in an area with hard water or high mineral content, consider installing a water softener or filtration system to prevent sediment buildup in the water heater, which can affect the pilot light.
By following these preventive maintenance practices, you can help extend the lifespan of your tankless water heater and minimize the risk of pilot light-related issues, ensuring a reliable and consistent supply of hot water for your home.
Seeking Professional Assistance
While some pilot light problems can be addressed through DIY troubleshooting, it’s important to recognize when it’s time to seek the help of a professional plumber or HVAC technician. Attempting to repair or service a tankless water heater without the proper training and equipment can be dangerous and may even void the manufacturer’s warranty.
Qualified technicians have the expertise and specialized tools required to diagnose and resolve more complex pilot light issues, such as:
- Malfunctioning gas control valves
- Problems with the thermocouple or other safety devices
- Issues related to the gas supply or pressure
- Complications arising from the water heater’s installation or venting system
Furthermore, professional technicians can provide valuable insights into preventive maintenance, helping you establish a proactive approach to keeping your tankless water heater in top condition and reducing the likelihood of future pilot light problems.
Whether you’re facing an immediate pilot light crisis or simply want to double-check that the long-term reliability of your tankless water heater, don’t hesitate to reach out to a qualified plumber or HVAC technician. Their expertise can save you time, money, and the potential for costly water damage or safety hazards.
Conclusion
Maintaining a properly functioning pilot light is crucial for ensuring the safe and reliable operation of your tankless water heater. By understanding the role of the pilot light, learning how to troubleshoot common issues, and implementing preventive maintenance practices, you can keep your water heater running smoothly and provide your household with a consistent supply of hot water.
Remember, when it comes to gas-powered appliances like tankless water heaters, safety should always be the top priority. If you encounter any pilot light problems that you’re uncomfortable addressing on your own, don’t hesitate to contact a professional for assistance. Their expertise can help you avoid potential hazards and double-check that the long-term efficiency and performance of your water heating system.
For more information and resources on tankless water heaters, maintenance, and plumbing solutions, be sure to visit waterheaterpick.com. Whether you’re a homeowner, a DIY enthusiast, or a professional in the industry, the team at Water Heater Pick is dedicated to providing the insights and guidance you need to keep your water heater running at its best.
Tip: Flush your water heater tank at least once per year
