If your water heater pilot light won't stay lit, the problem is usually caused by a failing thermocouple, a dirty pilot assembly, a gas supply issue, or a faulty gas control valve. Knowing what to check first can help you determine whether the issue is something simple or requires professional repair.
This guide covers the most common causes, safe relighting practices, and the warning signs that indicate it's time to call a plumber in Phoenix, Arizona.
Why Does a Water Heater Pilot Light Go Out?
Your water heater pilot light keeps going out because the flame is no longer being supported correctly. A worn thermocouple, dirt around the pilot assembly, drafts, gas supply problems, or a failing gas control valve are the most common causes.
Faulty Thermocouple
The water heater thermocouple is a safety device that detects the pilot flame. If it becomes dirty, worn, or damaged, it shuts off the gas supply because it no longer senses a stable flame. This is one of the most common reasons a pilot light repeatedly goes out.
Drafts Around the Water Heater
Air moving through the utility room can blow out a small pilot flame. Drafts from open doors, damaged venting, or changing airflow around the water heater can extinguish the flame before the thermocouple stays heated.
Dirty Pilot Orifice
Desert dust, debris, or mineral buildup can partially block the pilot opening and reduce the size of the flame. Phoenix's hard water also contributes to buildup, making periodic inspections necessary.
Interrupted Gas Supply
If the gas supply is interrupted or pressure drops below normal, the pilot flame may fail to stay lit. If other gas appliances are showing similar problems, the issue may extend beyond the water heater.
Failing Gas Control Valve
A failing gas control valve can interrupt fuel delivery to the pilot and burner, causing the water heater to not light or allowing the pilot flame to go out shortly after ignition.
How to Relight a Water Heater Pilot Light Safely
Many pilot light problems can be diagnosed by attempting to relight the water heater pilot. Always follow the instructions printed on your water heater or in the manufacturer's manual because procedures vary between models.
Before attempting to relight the pilot:
- Make sure you do not smell natural gas.
- Confirm the area around the water heater is clear.
- Follow every step listed on the appliance label.
- Allow gas to dissipate if instructed by the manufacturer.
If you smell gas at any point, stop immediately. Do not attempt to relight the pilot. Leave the area and contact your gas utility or a qualified professional.
If the pilot lights but immediately goes back out, the problem requires professional diagnosis.
When a Pilot Light Problem Means It's Time to Call a Plumber
A pilot light that refuses to stay lit after multiple attempts indicates a mechanical problem.
Professional service is recommended when:
- The pilot repeatedly goes out after being relit.
- The thermocouple appears worn or damaged.
- The gas control valve is suspected to be failing.
- You smell gas around the appliance.
- The water heater is older and experiencing repeated problems.
A technician can determine if water heater repair will solve the problem or if another component has reached the end of its service life.
Could It Be More Than the Pilot Light?
A pilot light problem is not always the only issue affecting your water heater.
If you have no hot water at all, the problem could involve additional components beyond the pilot assembly. Our guide on your water heater not heating explains other common causes that may be preventing your system from producing hot water.
If repairs are becoming more frequent and the unit is nearing the end of its expected lifespan, it may be the time to replace your water heater. In those situations, water heater replacement provides a better long-term solution than continuing to repair aging equipment.
Keep Your Water Heater Running Reliably – Contact Wolfgangs Today!
Routine water heater maintenance helps identify worn components before they lead to unexpected breakdowns. Cleaning the pilot assembly and inspecting safety controls help keep a gas water heater operating safely.
If your pilot light continues to go out after basic troubleshooting, Wolfgangs Cooling, Heating & Plumbing is ready to help. Our water heater services team diagnoses pilot light problems, gas control issues, and other water heater concerns throughout the Phoenix area.
Schedule online or call 480-582-1810 to schedule professional service.
Water Heater Pilot Light FAQs
Why does my water heater pilot light keep going out?
A worn thermocouple, dirty pilot assembly, drafts, gas supply problems, or a failing gas control valve are the most common causes. If the pilot repeatedly goes out after being relit, a professional inspection is recommended.
Is it safe to relight my water heater pilot light myself?
Yes, if you follow the manufacturer's instructions and do not smell gas. If you detect a gas odor or the pilot refuses to stay lit after several attempts, stop troubleshooting and contact a qualified professional.
What is a thermocouple and why does it matter?
The thermocouple is a safety device that confirms the pilot flame is burning. If it no longer senses heat, it automatically shuts off the gas supply to prevent unburned gas from entering the appliance.
How much does it cost to fix a water heater pilot light issue?
The cost depends on the failed component and the repairs required. A diagnostic visit allows a technician to identify the problem and provide upfront pricing before any work begins.
How do I know if I need a new water heater instead of a repair?
If the water heater is older, requires frequent repairs, or has multiple failing components, replacement may be the better option. A professional inspection can determine which solution makes the most sense.
