Why Does Pilot Light Go Out on Water Heater

Your water heater’s pilot light often goes out because drafts blow out the flame, dirt clogs the pilot orifice, or the thermocouple isn’t sensing heat properly. Gas supply issues, like closed valves or blockages, can also cut the flame. Moisture and corrosion can damage parts too. If you want to keep your heater running smoothly and avoid repeated outages, understanding these common causes and solutions will help you spot trouble early.

Common Causes of Pilot Light Failure

Although pilot lights are designed to stay lit continuously, several common issues can cause them to go out unexpectedly. You might notice your pilot light going out due to a draft or strong airflow, which blows the flame out. Dirt and debris can also clog the pilot orifice, preventing a steady flame.

If the gas supply is interrupted or insufficient, the pilot light won’t stay lit. Additionally, moisture buildup or corrosion around the pilot assembly can interfere with ignition. Sometimes, a faulty or dirty pilot light assembly itself causes failure.

The Role of the Thermocouple in Pilot Light Operation

If your pilot light keeps going out despite a clean and steady flame, the thermocouple might be the culprit. This small but vital component acts as a safety device, detecting whether the pilot light is lit. It generates a small electrical current when heated by the flame, signaling the gas valve to stay open.

If the thermocouple cools down or malfunctions, it stops sending this signal, causing the gas valve to close and the pilot light to go out. Over time, the thermocouple can wear out, become dirty, or misaligned, preventing it from detecting the flame properly.

Checking and replacing a faulty thermocouple often solves persistent pilot light issues and ensures your water heater runs safely and efficiently.

How Drafts and Airflow Affect the Pilot Light

Because pilot lights rely on a steady flame, drafts and improper airflow can easily cause them to flicker or go out. When your water heater is in a drafty area — near windows, doors, or vents — strong air currents can blow out the pilot light.

Even subtle airflow changes inside the water heater enclosure can disrupt the flame’s stability. You should check for any gaps or openings around the heater that let air rush through. Sealing these gaps or relocating the heater can reduce drafts.

Proper ventilation is crucial; you want enough airflow to support combustion but not so much that it disturbs the flame. By managing drafts and ensuring balanced airflow, you help keep your pilot light burning consistently and avoid unexpected outages.

Impact of Dirt and Debris on Pilot Light Performance

When dirt and debris build up around your pilot light, they can block the flame and cause it to sputter or go out entirely. You might notice your water heater struggles to stay lit because grime restricts the airflow needed for a steady flame.

Dust particles can also settle on the thermocouple, interfering with its ability to sense heat and keep the gas valve open. To prevent this, regularly inspect and clean the pilot light area using a soft brush or compressed air, ensuring no obstructions remain.

Keeping this part clean not only helps maintain consistent flame performance but also prolongs your water heater’s lifespan. Don’t overlook this simple maintenance step—it’s crucial for reliable operation and safety.

Gas Supply Problems That Can Extinguish the Pilot Light

Though your pilot light may seem to go out for no reason, gas supply problems often cause this issue. If the gas flow to your water heater is interrupted or inconsistent, the pilot light won’t stay lit.

You might have a closed or partially closed gas valve, which restricts fuel flow. Additionally, gas line leaks or blockages can reduce pressure, causing the flame to extinguish.

Sometimes, the regulator that controls gas pressure malfunctions, cutting off the supply needed to maintain the pilot light.

You should check that the gas valve is fully open and inspect the lines for damage or obstructions. Ensuring a steady and adequate gas supply prevents your pilot light from going out unexpectedly.

When to Call a Professional for Pilot Light Issues

If you’ve tried relighting the pilot light but it keeps going out, it’s time to call a professional.

Persistent pilot light issues often indicate deeper problems like faulty thermocouples, gas valve issues, or ventilation problems that require expert diagnosis.

Don’t attempt complicated repairs yourself, as handling gas appliances can be dangerous. Also, if you smell gas or suspect a leak, evacuate immediately and contact a professional right away.

Regular maintenance by a licensed technician can prevent pilot light problems and ensure your water heater operates safely and efficiently.

Calling a professional not only protects your safety but also extends the lifespan of your water heater.

When in doubt, trust an expert to handle pilot light repairs properly.

Frequently Asked Questions

How Do I Relight the Pilot Light Safely?

You’ll first turn off the gas and wait five minutes for any fumes to clear. Then, follow your water heater’s instructions: usually, you press the pilot button, ignite the flame with a lighter, and hold it until it stays lit.

Can a Pilot Light Outage Affect Water Heater Warranty?

Yes, a pilot light outage can affect your water heater warranty if it’s due to negligence or improper maintenance. Always follow the manufacturer’s guidelines and keep records to avoid voiding your warranty.

Is It Normal for the Pilot Light to Flicker Sometimes?

Yes, it’s normal for your pilot light to flicker occasionally due to drafts or minor gas flow changes. However, if it flickers constantly or goes out, you should check for issues or call a professional.

What Type of Gas Is Used for Pilot Lights?

You’ll typically find natural gas or propane used for pilot lights in water heaters. Both burn cleanly and efficiently, so you can trust they’ll keep your pilot light stable and reliable for heating water.

How Long Does a Pilot Light Typically Stay Lit?

A pilot light typically stays lit continuously, often for years, as long as the water heater functions properly. If yours goes out frequently, you’ll want to check for issues like drafts, faulty thermocouples, or gas supply problems.

Conclusion

If your water heater’s pilot light keeps going out, it’s usually due to common issues like a faulty thermocouple, drafts, dirt buildup, or gas supply problems. You can try cleaning the area and checking for airflow, but if the problem persists, don’t hesitate to call a professional. They’ll safely diagnose and fix the issue to keep your hot water flowing without interruption. Taking quick action helps avoid bigger, costly problems down the line.