If your water heater's pilot light won't stay lit, common causes include a dirty or faulty thermocouple, drafts blowing out the flame, or problems with the gas supply. To fix this, you should safely relight the pilot light and inspect the thermocouple for cleanliness and proper operation. Addressing these issues carefully can restore reliable water heater function without risking damage or gas hazards.
Why does the pilot light keep going out?
The pilot light stays lit because a small flame ignites the main burner when hot water is needed. If it keeps going out, a dirty or faulty thermocouple is often the cause. This small sensor detects the flame’s heat and tells the gas valve to stay open. When it’s dirty or malfunctioning, the valve closes, cutting off gas and extinguishing the pilot.
Drafts near the water heater can also blow out the pilot flame. Air currents from open windows, vents, or fans can cause the small flame to flicker or go out.
Gas supply issues may cause the pilot to go out as well. If gas pressure is inconsistent or interrupted, the flame won’t stay lit. Faulty or clogged gas valves can also disrupt the gas flow.
In short, the pilot light goes out because the flame is blown out, the heat isn’t detected properly, or the gas flow is interrupted.
Is it safe to relight the pilot light yourself?
Relighting your water heater pilot light is generally safe if you follow key precautions. First, check carefully for any gas odor around the heater. If you smell gas strongly, do not attempt to relight it. Leave the area immediately and call a professional to avoid explosion or poisoning risks.
Make sure the area is well ventilated by opening a window or door nearby to clear any gas buildup. Avoid sparks, flames, or smoking until you’re sure there is no gas buildup.
If the pilot won’t stay lit after several attempts or you notice unusual noises, corrosion, or damage to the water heater, call a professional plumber or technician.
If there is no gas smell and the area is ventilated, you can safely relight the pilot by following the correct steps carefully.
How do I relight the pilot light step-by-step?
- Locate the pilot light assembly, usually near the bottom front panel of your water heater.
- Turn the gas control knob to the “Off” position and wait 5 minutes to clear any gas.
- Turn the knob to the “Pilot” position.
- Press and hold the reset button or gas control knob while using a long lighter or match to ignite the pilot flame.
- Keep holding the button for about 30 seconds after lighting to let the thermocouple warm up and signal the gas valve to stay open.
- Slowly release the button. The pilot should remain lit. If it goes out, try the process once more.
- Once the pilot stays lit, turn the gas control knob to the “On” position to allow the main burner to operate.
If the pilot won’t ignite after several tries or won’t stay lit, stop and check the thermocouple or call a professional.
How to inspect and clean the thermocouple?
The thermocouple is a small metal rod positioned in the pilot flame. It senses heat and keeps the gas valve open. Dirt or soot buildup can block heat detection, causing the gas supply to shut off and the pilot to go out.
To inspect and clean it:
- Turn off the gas control valve and shut off the water heater completely.
- Find the thermocouple near the pilot light assembly; it looks like a thin copper or metal tube.
- Carefully loosen the nut connecting the thermocouple to the gas valve with an adjustable wrench.
- Remove the thermocouple gently.
- Clean the metal rod using fine steel wool or sandpaper to remove soot or corrosion.
- Wipe the cleaned thermocouple with a dry cloth.
- Reinstall it securely and tighten the nut.
- Turn the gas back on and try relighting the pilot light.
If cleaning doesn’t fix the issue or the thermocouple is damaged or bent, replace it. Replacement parts compatible with your water heater model are inexpensive and usually easy to install following the same steps.
How to verify the pilot light problem is fixed?
After relighting and any cleaning or adjustments, watch the pilot light for 10 to 15 minutes.
A successful fix means the pilot light stays steadily lit without flickering or going out. The main burner should ignite normally when you use hot water.
If the pilot flame goes out quickly again or looks weak, yellow, or uneven, the problem remains. This could mean the thermocouple is still faulty, drafts are present, or gas pressure is unstable.
Listen for clicking or unusual sounds from the gas valve, which may indicate a malfunction.
If the pilot is steady and the water heater heats water properly, the issue is likely resolved for now.
When should I call a professional?
Call a professional plumber or heating technician if:
- You smell gas strongly or suspect a leak.
- The pilot light won’t stay lit after cleaning or replacing the thermocouple.
- The gas control valve or burner assembly appears damaged.
- You see corrosion, rust, or cracks on the water heater.
- The pilot flame is very weak or erratic despite no drafts and proper gas supply.
- You feel uncomfortable or unsure about handling gas appliances safely.
These signs may indicate deeper issues that require expert tools and knowledge. A professional can test gas pressure and safety controls to prevent hazards.
What safety tips should I follow to prevent future pilot light issues?
To keep your water heater pilot light stable and reduce outages:
- Perform regular maintenance, including cleaning the pilot area and thermocouple once a year.
- Avoid placing the water heater where drafts from windows, vents, or fans can blow on the pilot flame.
- Ensure the area around the heater is ventilated but not drafty.
- Inspect gas connections regularly for leaks or corrosion.
- Replace a thermocouple promptly if it shows wear or damage.
- Keep combustible materials away from the water heater.
Following these steps helps maintain a strong pilot flame and safe operation.
Conclusion
If your water heater pilot light won’t stay lit, start by safely relighting it and inspecting the thermocouple for dirt or damage. Cleaning or replacing the thermocouple often solves the problem. Watch the pilot flame carefully after relighting to confirm the fix. If you detect gas smells, persistent pilot outages, or damage to the appliance, call a professional promptly. Regular maintenance and keeping drafts away will help prevent future issues.
Frequently Asked Questions
Why does my pilot light keep going out even after cleaning the thermocouple?
If the pilot light still won’t stay lit after cleaning or replacing the thermocouple, drafts or gas supply problems might be the cause. Check for strong air currents around the water heater and ensure your gas supply is steady. If these are fine, a professional should inspect the gas valve and burner assembly.
Can I use a regular lighter to relight the pilot light?
You can use a long match or lighter to relight the pilot if your water heater doesn’t have a built-in ignition button. Just be sure to keep your hand well away from the flame and follow all safety steps to clear any gas buildup before lighting.