Why Does My Water Heater Pilot Light Keep Going Out?
Your water heater pilot light keeps going out because of several common issues. These include a dirty pilot tube, faulty thermocouple, improper gas pressure, drafts near the water heater, or a damaged gas control valve. The pilot light is a small flame that ignites the main burner in your gas water heater. When it goes out, your water heater stops heating water. This problem is frustrating but often fixable without calling a professional. In this guide, we’ll walk through simple pilot light troubleshooting steps and explain when you should call a plumber for help with your gas water heater problems.
Table of Contents
| Common Causes | Possible Solutions | Difficulty Level |
|---|---|---|
| Dirty Pilot Tube | Clean with compressed air or fine wire | Easy |
| Faulty Thermocouple | Reposition or replace thermocouple | Moderate |
| Gas Supply Issues | Check gas valve and pressure | Easy |
| Drafts | Eliminate air currents near heater | Easy |
| Damaged Gas Valve | Professional replacement needed | Difficult |
Understanding Your Water Heater Pilot Light
The water heater pilot light is a small, continuous flame that ignites the main burner when your water heater needs to heat water. It’s a key component in gas water heaters. When you turn on hot water in your home, the thermostat signals the main gas valve to open. The pilot light then ignites this gas, heating the water in your tank.
Think of the pilot light as a match that’s always ready to start a bigger fire. When it goes out, your water heater can’t do its job. This means no hot water for showers, dishes, or laundry.
How the Pilot Light Works
Your water heater pilot light works with two other important parts: the thermocouple and the gas valve. The thermocouple is a safety device that senses when the pilot light is on. If the pilot light goes out, the thermocouple cools down and signals the gas valve to shut off. This prevents gas from leaking into your home.
The gas valve controls the flow of gas to both the pilot light and the main burner. When everything works right, this system keeps your water hot and your home safe. But when the pilot light won’t stay lit, something in this system isn’t working properly.
Common Reasons Your Water Heater Pilot Light Keeps Going Out
Let’s look at the most common reasons your water heater pilot light keeps going out and what you can do about each one.
Dirty Pilot Tube
Over time, the pilot tube can get clogged with dirt, dust, or carbon buildup. When this happens, the gas can’t flow properly, and the pilot light may go out. This is one of the most common gas water heater problems.
To fix this:
- Turn off the gas to your water heater
- Locate the pilot tube (a small metal tube near the burner)
- Gently clean it with compressed air or a fine wire
- Relight the pilot following manufacturer instructions
Regular cleaning can prevent this issue from happening again. Think of it like keeping a straw clean so your drink can flow through it easily.
Faulty Thermocouple
The thermocouple is a safety device that senses when your pilot light is on. If it’s faulty, bent, or too far from the pilot flame, it might falsely signal that the pilot light is out. This causes the gas valve to shut off, and your pilot light goes out.
When doing pilot light troubleshooting, check if the thermocouple is:
- Bent away from the pilot flame
- Covered in carbon buildup
- Damaged or worn out
You can try repositioning the thermocouple closer to the pilot flame. If that doesn’t work, replacing the thermocouple is a common fix. This part usually costs $10-20 and can be replaced with basic tools.
Gas Supply Issues
Sometimes the problem isn’t with the water heater itself but with the gas supply. If the gas pressure is too low or inconsistent, your pilot light won’t stay lit.
Check these gas supply issues:
- Make sure the gas valve to the water heater is fully open
- Check if other gas appliances are working properly
- Look for kinks in the gas line
- Make sure your gas bill is paid (if gas service was interrupted)
If you suspect gas pressure problems, it’s best to call a professional. Working with gas lines can be dangerous if you don’t have the right training.
Drafts Near the Water Heater
Air currents near your water heater can blow out the pilot light. This is especially common in garages, basements, or utility rooms where doors or windows create drafts.
To fix draft-related pilot light issues:
- Check for open windows or doors near the water heater
- Look for air vents blowing directly at the unit
- Consider installing a draft guard around the pilot area
- Make sure the water heater cover panel is properly secured
Eliminating these drafts can help keep your pilot light burning steadily. It’s like protecting a candle from the wind.
Damaged Gas Control Valve
The gas control valve regulates gas flow to both the pilot light and main burner. If it’s damaged or failing, your pilot light won’t stay lit. This is one of the more serious water heater ignition issues.
Signs of a bad gas control valve include:
- Pilot light that goes out immediately after lighting
- Strange noises from the valve area
- Visible damage or corrosion on the valve
- Water leaking around the valve
Replacing a gas control valve is usually a job for professionals. The part itself costs $40-150, plus labor. This repair might make you consider whether it’s time for a new water heater, especially if yours is over 10 years old.
How to Relight Your Water Heater Pilot Light
When your pilot light won’t stay lit, you’ll need to relight it. Here’s a simple step-by-step guide:
Safety First
Before attempting to relight your water heater pilot light:
- Make sure there’s no gas smell in the area
- If you smell gas, leave the house and call your gas company immediately
- Turn off the gas control valve and wait 5-10 minutes for any gas to dissipate
- Remove the access panel to reach the pilot light assembly
Safety is the most important part of any water heater repair. Gas leaks are dangerous and should be handled by professionals.
Step-by-Step Relighting Process
1. Find the pilot light assembly: Look for a small tube near the bottom of the water heater tank.
2. Set the gas valve to “Pilot”: Turn the knob to the “Pilot” setting. On some models, you’ll need to press and hold this knob down.
3. Light the pilot: While holding the knob, use a long lighter or match to ignite the pilot. Many newer water heaters have a red or black igniter button you can press instead.
4. Keep holding the knob: After the pilot lights, continue holding the knob for about 30-60 seconds. This gives the thermocouple time to heat up.
5. Release and check: Slowly release the knob and make sure the pilot stays lit. If it does, turn the knob to the “On” position.
6. Replace the access panel: Put the cover back on and you’re done!
If your pilot light won’t stay lit after several attempts, you likely have one of the problems we discussed earlier.
DIY Pilot Light Troubleshooting Tips
Before calling a professional, try these pilot light troubleshooting steps:
Check and Clean the Thermocouple
The thermocouple might just need cleaning or adjusting:
- Turn off the gas to the water heater
- Locate the thermocouple (a copper rod near the pilot tube)
- Gently clean it with fine sandpaper or steel wool
- Make sure it’s positioned in the pilot flame
A clean thermocouple works better at sensing the pilot flame. This simple fix solves many pilot light problems.
Inspect the Pilot Tube
A clogged pilot tube is a common cause of water heater ignition issues:
- Look for any visible blockage in the pilot tube
- Use compressed air to blow out any debris
- For stubborn clogs, use a thin wire to carefully clear the opening
Think of this like unclogging a tiny straw. Once clear, gas can flow properly to keep your pilot light burning.
Check for Drafts
To test for drafts that might be blowing out your pilot light:
- Light a match or candle near your water heater (at a safe distance)
- Watch if the flame bends in a particular direction
- Look for sources of air movement like vents, fans, or gaps
- Block any drafts with appropriate materials
Eliminating drafts can be as simple as closing a door or sealing a gap. This easy fix might solve your pilot light problems.
When to Call a Professional for Water Heater Pilot Light Issues
While many pilot light problems can be fixed yourself, some situations require professional help:
Gas-Related Safety Concerns
Call a professional immediately if:
- You smell gas near your water heater
- The pilot light has a yellow or orange flame instead of blue
- You hear hissing sounds near the gas line
- There’s soot or black marks around the burner area
These signs could indicate dangerous gas leaks or combustion problems. Don’t try to fix these yourself.
Persistent Pilot Light Problems
If you’ve tried the DIY fixes and your water heater pilot light keeps going out, it’s time for professional help. A plumber can:
- Test gas pressure with specialized tools
- Replace complex parts like the gas control valve
- Identify hidden problems you might miss
- Determine if your water heater needs replacement
Professional repairs typically cost $150-300, depending on the problem. While this might seem expensive, it’s worth it for your safety and to properly fix the issue.
Preventing Future Pilot Light Problems
Keep your water heater pilot light working reliably with these preventive measures:
Regular Maintenance
Schedule annual water heater maintenance to:
- Clean the pilot tube and thermocouple
- Check for proper gas pressure
- Inspect the burner for efficient operation
- Test all safety features
Regular maintenance not only prevents pilot light issues but also extends the life of your water heater. It’s like getting regular oil changes for your car.
Keep the Area Clean
A clean water heater environment helps prevent problems:
- Keep the area around your water heater free of dust and debris
- Don’t store flammable materials nearby
- Ensure proper ventilation around the unit
- Consider a water heater blanket for efficiency (but don’t cover the top or bottom)
A clean, well-ventilated space reduces the chance of dirt clogging the pilot tube or thermocouple.
Frequently Asked Questions
How often should I check my water heater pilot light?
You should check your water heater pilot light monthly. Look for a steady blue flame. If it’s yellow or orange, or if it frequently goes out, your water heater needs attention. Regular checks help catch problems early.
Is it dangerous if my pilot light keeps going out?
It can be. While modern water heaters have safety features to prevent gas leaks, a pilot light that repeatedly goes out might indicate problems with gas flow or ventilation. These issues could potentially lead to gas buildup or improper combustion. If you smell gas or can’t fix the problem easily, call a professional.
How much does it cost to fix a water heater pilot light?
DIY fixes like cleaning the thermocouple or pilot tube cost almost nothing. Professional repairs range from $150-300 depending on the parts needed. Replacing a thermocouple might cost $150, while a new gas control valve could be $200-300 installed.
How long should a water heater pilot light stay lit?
A properly functioning water heater pilot light should stay lit indefinitely. It’s designed to burn continuously, using very little gas. If your pilot light goes out within days or weeks of relighting it, there’s definitely a problem that needs fixing.
Can I shower if the pilot light is out?
You can shower, but the water will be cold. When the pilot light is out, your water heater can’t heat water. The existing hot water in the tank will gradually cool down. If you need hot water, you’ll need to relight the pilot light and wait for the water to heat up (usually 30-60 minutes).
Solving Your Water Heater Pilot Light Problems
When your water heater pilot light keeps going out, it’s usually due to one of the issues we’ve covered: a dirty pilot tube, faulty thermocouple, gas supply problems, drafts, or a damaged gas control valve. Most of these problems can be fixed with simple pilot light troubleshooting steps.
Remember that regular maintenance is key to preventing future problems. Cleaning the pilot tube and thermocouple yearly can save you from the frustration of cold showers and repeated relighting attempts.
For persistent water heater ignition issues or anything involving gas safety, don’t hesitate to call a professional. Your family’s safety is worth more than the cost of a service call.
Need help with your water heater pilot light or other plumbing issues? Ark Plumbing’s experienced technicians can diagnose and fix your water heater problems quickly and safely. Call us today to schedule an appointment and get your hot water flowing reliably again!