7 Reasons Why Water Heater Pilot Light Keeps Going Out and How to Fix Them

If your water heater pilot light keeps going out, it’s essential to identify the cause and find a solution. This common issue can be frustrating and may signal underlying problems with your water heater.

The pilot light in a water heater is a small flame that ignites the main burner. When it goes out frequently, it can be due to several factors. A primary cause is a faulty thermocouple, which is a safety device that detects whether the pilot light is lit. If the thermocouple is malfunctioning, dirty, or misaligned, it may incorrectly shut off the gas supply, causing the pilot light to go out. Regular cleaning and proper alignment can resolve this issue.

Environmental factors like wind can also extinguish the pilot light, especially in outdoor installations or areas with poor ventilation. Adjusting the water heater’s location or improving the shielding can help mitigate this problem.

It’s also worth noting that some water heater models, like those from Rheem, Whirlpool, and Richmond, have specific quirks that might cause pilot light problems.

These could range from sensitivity to temperature control adjustments to specific component issues. In such cases, consulting the manufacturer’s guidelines or seeking professional assistance is advisable.

Table of Contents

Pilot Light Explained: Functions and Mechanics

A pilot light is a small, continuously burning flame in gas appliances like water heaters, furnaces, and stoves. It plays a crucial role in the safety and functionality of these appliances.

The pilot light ignites the main burner when the appliance needs to heat up. In water heaters, this light stays on persistently, ensuring instant ignition of the burner whenever hot water is needed. The pilot light is fueled by a small amount of gas from the appliance’s main gas supply.

The process starts with the pilot light’s flame heating a component known as the thermocouple. When heated, the thermocouple generates a small electric current that signals the gas valve to stay open, allowing gas to flow to the main burner. This seamless operation is essential for the consistent performance of the appliance.

Read More: The 8 Best Tankless Water H eaters

Risks of a Pilot Light Going Out

If the pilot light in a water heater goes out, it can lead to several issues. Primarily, it prevents the water heater from heating water, as the main burner cannot ignite without the pilot light’s flame. This results in a lack of hot water supply in the household.

More importantly, a pilot light that frequently goes out could be indicative of a larger issue, such as a faulty thermocouple, a clogged pilot tube, or problems with gas supply or ventilation.

If the pilot light goes out, it’s essential to relight it following the manufacturer’s instructions. However, if the problem persists, it could signify that the appliance needs maintenance or repair.

Learn More: Water Heater Reset Button Keeps Tripping: Causes & Fixes

Common Causes of Water Heater Pilot Light Issues

Maintaining a functional water heater is essential for everyday comfort, and addressing pilot light issues is a common part of this maintenance. Here are seven reasons why a water heater pilot light may keep going out, along with solutions for each.

1. Faulty Thermocouple

A thermocouple is a safety device that shuts off the gas if the pilot light is out. If it’s faulty or misaligned, it can mistakenly signal that the pilot light is extinguished, leading to gas supply being cut off.

To fix this, first check the thermocouple’s position and adjust it to be in direct contact with the pilot light’s flame. If the problem persists, clean the thermocouple with fine-grit sandpaper. Should these steps not resolve the issue, replacing the thermocouple is advised.

2. Clogged Pilot Tube

The pilot tube delivers gas to the pilot light. A clogged pilot tube due to dirt or debris can disrupt the gas flow, causing the pilot light to go out.

To clear the blockage, shut off the gas and remove the pilot tube. Clean it using a needle or compressed air, ensuring that all debris is removed.

Reattach the tube and relight the pilot light to check if the problem is resolved.

3. Inadequate Air Supply

Combustion requires an adequate air supply. A pilot light going out could be a sign of insufficient air, particularly in confined spaces.

Ensuring good ventilation is key. This might involve adjusting the water heater’s location or improving the air flow to the installation area. Regular checks for obstructions that may hinder air flow are also vital.

4. Wind and Drafts

In outdoor installations or areas prone to drafts, wind can blow out the pilot light. To prevent this, reposition the water heater or provide a wind barrier. Also, inspect the installation site for any gaps that allow drafts and seal them accordingly.

5. Control Valve Issues

A malfunctioning control valve can lead to inconsistent gas flow, causing the pilot light to extinguish.

Typically, this problem requires professional intervention. A technician can determine if the control valve needs repair or replacement.

6. Dirty Burner Assembly

A dirty burner assembly can impede the pilot light’s function. Regular cleaning of the burner assembly is crucial.

Turn off the gas and power, then carefully clean the burner and surrounding area, removing any dirt or debris. This ensures the gas can flow freely and the pilot light functions properly.

7. Fluctuating Gas Pressure

Variable gas pressure in your home can affect the pilot light. If the gas pressure is too low, it might not sustain the pilot light.

Consulting with a gas utility provider or a professional plumber to assess and correct gas pressure issues is recommended. They can adjust the pressure or investigate other causes related to the gas supply system.

Common Causes of Water Heater Pilot Light Issues

Continuous Operation of Pilot Lights in Water Heaters

In most traditional water heaters, the pilot light remains lit at all times. This constant operation ensures that the water heater is ready to heat water as needed. The pilot light’s continuous flame is small and uses a minimal amount of gas.

However, newer water heater models may use electronic ignition systems that do not require a constantly burning pilot light.

These systems ignite the burner directly with an electric spark only when the water needs heating, which can be more energy-efficient.

Bradford White and Rheem Water Heater Pilot Troubleshooting

Bradford White Pilot Issues

Common issues with Bradford White water heaters include a weak pilot flame and thermocouple problems. Ensuring the pilot tube is clear and the thermocouple is properly positioned and functioning is key.

Rheem Pilot Light Solutions

Rheem models often face issues like a dirty pilot orifice or a malfunctioning control valve. Regular cleaning of the pilot orifice and checking the control valve for proper operation are essential steps in troubleshooting.

Preventive Maintenance for Pilot Lights

Regular Cleaning

Keep the pilot assembly, including the pilot tube and orifice, clean from debris and dust to ensure a steady flame.

Inspection and Testing

Conduct routine inspections of the thermocouple, pilot tube, and control valve to ensure their proper functioning and prevent pilot light failures.

Advanced Solutions for Recurring Pilot Light Issues

Control Valve Replacement

If basic troubleshooting doesn’t resolve the issue, consider replacing the main control valve.

Addressing Wiring Issues

Check for any wiring problems and consult a professional for complex electrical issues.

Professional Assistance

For persistent problems, seek professional help to diagnose and fix issues beyond basic maintenance and troubleshooting.

More Relative Questions and Answers

Why is the pilot light flame too weak to stay lit?

A weak pilot light flame could result from several issues. One common cause is a dirty or clogged pilot tube. Sediment and debris can accumulate over time and restrict the flow of gas to the pilot light. Another possibility is low gas pressure, which may be due to a problem with the gas supply or the pressure regulator. The pilot orifice could also be partially blocked, reducing the flame size. Ensuring that the gas supply is steady and the pilot light components are clean and properly aligned is crucial to maintaining a strong flame.

How can a faulty gas valve affect the pilot light?

A faulty gas valve can severely impact the functionality of your water heater’s pilot light. The gas valve is responsible for regulating the flow of gas to the pilot light and the burner. If it’s not working correctly, it may not deliver a consistent gas flow, causing the pilot light to go out frequently. This issue can stem from internal damage, worn-out parts, or manufacturing defects. Replacing a faulty gas valve usually requires a professional plumber or technician, as it involves handling gas lines and ensuring that the component is correctly installed and calibrated.

What role does the wind draft play in extinguishing the pilot light?

Wind drafts can be a significant reason why your water heater’s pilot light keeps going out. If the pilot light is constantly exposed to breezes or drafts, whether from nearby windows, vents, or doors opening and closing, the flame can be blown out easily. Ensuring that the water heater is placed in a well-sheltered area, away from direct drafts, or installing a wind guard can help resolve this issue. Additionally, you can inspect the area for any loose panels or openings that might allow drafts to reach the pilot flame.

How can air in the gas line impact the pilot light?

Having air trapped in the gas line can cause inconsistent gas flow to the pilot light, making it challenging to stay lit. When air is trapped in the gas line, it can create pockets that interrupt the steady flow of gas, causing the pilot light to flicker and go out. Bleeding the gas line to remove any trapped air is a potential solution, but this process might require professional assistance to ensure it’s done safely and effectively. Ensuring that the line is clear and unobstructed will help maintain a consistent fuel supply to the pilot light.

Does the position of the thermocouple affect the pilot light staying lit?

Yes, the position of the thermocouple relative to the pilot light is crucial for the proper functioning of the water heater. The thermocouple should be positioned such that its tip is directly in the pilot flame. If it’s too far away, it won’t sense the heat accurately, leading the safety valve to presume that the flame is out and, consequently, shutting off the gas supply. If repositioning doesn’t solve the issue, the thermocouple might need a replacement to ensure it’s effectively sensing the pilot light. Proper adjustment and positioning are key to maintaining the thermocouple’s functionality.