You’re in the middle of a shower and, bam, cold water. Again. If this has happened more than once, your water heater pilot light is likely the culprit. This small flame plays a big role, and when it won’t stay lit, you’re left without hot water. In this guide, you’ll learn why the pilot light keeps going out, how to troubleshoot it safely, and when it’s time to call a professional.
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Quick Answer: Why Does the Water Heater Pilot Light Keep Going Out?
Top reasons your water heater pilot light won’t stay lit:
Dirty or faulty thermocouple
Weak or inconsistent gas supply
Blocked or clogged pilot tube
Drafts or poor ventilation
Defective gas control valve
If your water heater pilot light won’t stay lit, the most likely causes are a bad thermocouple, restricted airflow, or a faulty gas control valve.
Understanding the Water Heater Pilot Light System
The pilot light in a gas water heater is a small flame that ignites the gas burner. It works hand-in-hand with the thermocouple, a safety sensor that detects the flame. If the thermocouple doesn’t sense a flame, it signals the gas valve to shut off, preventing leaks or explosions. This safety mechanism means that if anything disrupts the flame, your heater shuts down until it’s fixed.
Key Components:
Pilot Light
Ignites the burner.
Thermocouple
Senses flame and controls gas valve.
Gas Control Valve
Regulates gas flow to the burner and pilot.
Step-by-Step: How to Troubleshoot and Fix Water Heater Pilot Light
Step 1: Check for Obvious Issues
Gas Supply
Make sure the main gas valve is open.
Visible Obstructions
Look for dust, soot, or dirt around the pilot.
Step 2: Inspect and Clean the Thermocouple
What it does: The thermocouple sends a voltage to keep the gas valve open.
Signs it’s failing:
Soot buildup
Misalignment
Corrosion
How to clean it:
- Turn off the gas.
- Wait for everything to cool.
- Use fine-grit sandpaper or steel wool to clean the tip.
- Realign it so it's about ¼ inch from the pilot flame.
Step 3: Clear the Pilot Tube
Clog symptoms:
Weak or flickering flame
Flame that goes out quickly
Cleaning method:
- Shut off the gas.
- Remove the pilot tube.
- Blow compressed air through the tube to dislodge debris.
- Reattach and test.
Step 4: Check or Replace the Gas Control Valve
When to do this: If you’ve cleaned the thermocouple and tube but the light still won’t stay lit.
Warning: Replacing this part requires handling gas connections. If you’re not experienced, call a pro.
Bonus Tip: Need a visual guide? Watch our YouTube video “How to Light a Water Heater Pilot Light” for step-by-step help.
When to Call a Pro
Some issues need expert help. Call a professional plumber if:
The pilot won’t stay lit even after cleaning
You smell gas or suspect a leak
The gas control valve or burner needs replacing
Your water heater is over 10 years old and having frequent issues
Pro Tips for Preventing Future Water Heater Pilot Light Problems
Some issues need expert help. Call a professional plumber if:
Schedule Annual Maintenance
Flush the tank and inspect components yearly.
Keep the Area Clean
Ensure no dust or debris near the unit.
Improve Ventilation
Prevent drafts and check that the flue is clear.
Install a Sediment Filter
Especially important if you have well water.
Upgrade to Electronic Ignition
More reliable and efficient in the long run.
Key Takeaways: Don’t Let Cold Showers Win
Some issues need expert help. Call a professional plumber if:
A water heater pilot light that keeps going out is usually caused by a bad thermocouple, clogged pilot tube, or airflow issue.
Basic troubleshooting can be done safely by most homeowners, but gas-related repairs should be left to the pros.
Regular maintenance is key to preventing pilot light problems.
A water heater pilot light that keeps going out isn’t just frustrating, it’s a sign that something needs attention. Whether it’s a dirty thermocouple, a drafty area, or a failing gas control valve, understanding the root cause puts you back in control. By following the troubleshooting steps outlined here, you can often solve the issue yourself safely and quickly. But if the problem persists or involves gas components, don’t hesitate to call in a professional.
At the end of the day, reliable hot water is more than a luxury, it’s a necessity. And keeping your water heater running smoothly starts with making sure that small flame stays lit.
Still having issues with your pilot light? Call Oasis Plumbing Miami today. We’ll inspect, clean, and restore your hot water fast and safely.
Frequently Asked Questions
Is it dangerous if my pilot light keeps going out?
Yes, it could signal a gas flow or ventilation issue. Get it checked.
How much does it cost to fix a thermocouple?
Expect to pay between $75 and $150, including labor.
Can I relight the pilot myself?
Yes, follow the manufacturer’s instructions and ensure there’s no gas smell first. Or you can watch our YouTube video “How to Light a Water Heater Pilot Light” for step-by-step help.
Should I replace my water heater instead?
If it’s over 10 years old or has recurring issues, replacing it might be more cost-effective in the long run.
