5 Reasons the Pilot Light Goes Out on Your Water Heater

A water heater’s pilot light sparks the heat that keeps your showers warm and your dishes clean. However, when that tiny flame goes out, it can feel like a big inconvenience. The causes aren’t always obvious but usually stem from a few common issues. Understanding what’s behind a pilot light outage can save you time, hassle, and, often, a cold morning surprise. 

Here are five common reasons your water heater’s pilot light might be going out and what you can do about each issue.

Gas Supply Issues That Extinguish Your Pilot Light

When the gas supply to your water heater is interrupted, even briefly, the pilot light can go out. This tiny flame needs a constant flow of gas to stay lit. If there’s a disruption, like low gas pressure, a partially closed valve, or a temporary gas outage—the pilot flame won’t hold.

What You Can Do to Fix the Gas Supply Issue?

Check if the gas valve leading to your water heater is fully open. Sometimes, a slight adjustment is needed to restore the flow. If you suspect a larger issue with gas pressure or think there’s an outage, contact your gas provider. For recurring problems, consider having a professional inspect the gas line to ensure safe, uninterrupted flow.

Faulty Thermocouple Causing the Pilot Light to Go Out

The thermocouple is a small metal rod positioned near the pilot light that serves a critical safety function. It senses the heat from the flame and keeps the gas valve open as long as the flame is burning. If the thermocouple is damaged, dirty, or misaligned, it may not detect the flame, causing the gas supply to shut off and extinguish the pilot light.

What You Can Do to Fix the Faulty Thermocouple?

Inspect the thermocouple for any visible dirt or misalignment. Gently cleaning the thermocouple with fine sandpaper can sometimes solve the problem. If it is worn out or damaged, replacing it may be necessary. A professional can ensure it’s correctly installed and positioned if you’re unsure about the replacement process.

Drafts Extinguishing Your Pilot Light

Unexpected drafts or strong air currents around the water heater can blow out the pilot light. This issue is particularly common in water heaters near windows, doors, or ventilation systems. Even a small draft can disrupt the flame and cause it to go out.

What You Can Do to Fix Draft Issues?

Inspect the area around your water heater for possible sources of drafts. If you find windows or vents nearby, minimize airflow by closing them or adding insulation. Consider placing a draft guard or wind barrier near the heater to help keep the pilot light stable. If drafts remain a problem, a professional technician can assess the location and suggest additional solutions to keep your pilot light from going out.

Blocked Pilot Tube Preventing the Pilot Light from Staying Lit

Over time, dust, dirt, or mineral buildup can clog the pilot tube, which supplies gas to the pilot light. When the tube is blocked or restricted, it can prevent a steady gas flow, making it difficult for the pilot light to stay lit. Even a small amount of debris can cause the flame to flicker or go out completely.

What You Can Do to Fix a Blocked Pilot Tube?

Turn off the gas supply to your water heater and let it cool down. Carefully clean out any visible debris from the pilot tube using a thin wire or needle. Be cautious not to damage the tube or push debris further in. If cleaning the tube doesn’t resolve the issue, consider calling a professional technician for a more thorough inspection and cleaning.

Faulty Control Valve Shutting Off the Pilot Light

The control valve regulates the flow of gas to your water heater. If it malfunctions, it can cut off the gas supply to the pilot light, causing it to go out. Control valve issues can result from internal wear, damage, or debris buildup that affects its function.

What You Can Do to Fix a Faulty Control Valve?

Since the control valve is a complex component, it’s best to have it inspected by a professional if you suspect it’s causing the problem. A technician can test the valve’s function and replace it if necessary to maintain a steady gas flow. Avoid DIY repair of the control valve independently, as improper handling can be hazardous.

How to Relight Your Water Heater’s Pilot Light?

Relighting your water heater’s pilot light is straightforward, but following safety guidelines for your specific unit is essential. 

Here’s a step-by-step guide:

Gas Water Heaters

• Turn the gas control knob to the “Off” position and wait five minutes to clear any gas.
• Switch the knob to “Pilot” and press it down to start the gas flow to the pilot tube.
• While holding the knob down, use a lighter or the igniter button to light the pilot.
• Once lit, keep holding the knob down for about 30 seconds, then release.
• Turn the knob to the “On” position.

Electric Water Heaters

Most electric water heaters don’t use pilot lights but rely on an electric ignition system. If the heater isn’t working, it’s usually due to an electrical issue rather than the pilot light. In this case, checking the circuit breaker or calling a professional may be necessary.

Tankless Water Heaters

Tankless water heaters with pilot lights can be relit similarly to gas water heaters. However, newer models typically use electronic ignition, which doesn’t require manual relighting. If the pilot light is out, consult the manufacturer’s manual for specific instructions, which may indicate an internal issue.

Is It Dangerous if the Pilot Light Goes Out on a Water Heater?

Thanks to built-in safety features, it typically isn’t dangerous when the pilot light goes out. Most water heaters have a thermocouple that automatically shuts off the gas supply if it doesn’t detect a flame, preventing gas leaks. 

However, if you smell gas when the pilot is out, this could indicate a leak. Avoid trying to relight the pilot, ventilate the area, and immediately contact your gas provider or a professional. 

Call a Professional Water Heater Repair Service for a Malfunctioning Pilot Light

While many pilot light issues can be resolved with a few troubleshooting steps, some situations require expert help. If your pilot light keeps going out, or you notice gas odors, unusual noises, or any persistent issues, it’s best to call a professional to inspect and repair your water heater. 

Gwinnett Plumber Pro is your trusted plumbing service in Lawrenceville, GA, offering reliable and prompt water heater repairs. With a team of skilled technicians, we ensure safe and efficient solutions for all your water heater needs, from pilot light issues to complete system inspections. 

Call (706) 224-1385 to schedule service.