How to Relight a Water Heater’s Pilot Light

Is your water heater's pilot light constantly going out? Don't worry, there are several reasons why this might be happening, and understanding the most common causes can help you find a long-term solution. Let's explore some troubleshooting tips so you can enjoy hot water whenever you need it.

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Gas Pressure Changes

The pilot light of a water heater can be affected by changes in gas pressure. Normally, gas pressure remains constant unless there is some sort of intervention. Even then, the pressure should return to normal fairly quickly. By relighting your pilot light, you can reset the system, but in some cases, gas pressure becomes a persistent problem. This usually indicates an issue outside of the water heater, possibly with the external gas lines.

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Issues with the Thermocouple/Thermopile

The main function of a water heater's thermocouple/thermopile is to supply power to the gas valve and shut off the gas flow if the pilot light goes out. However, if the thermocouple/thermopile itself is broken, the automatic safety valve in the gas valve won't receive power, and the pilot light won't stay on when the knob is released.

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Drafts

When investigating a pilot light that won't stay on, be mindful of drafts that may blow out the flame. Sometimes, an open door (if your water heater is located in the garage or a utility space that opens to the outside) can be enough to cause a gust of wind that extinguishes that small, delicate flame.

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Lack of Combustible Air

Lighting a water heater's pilot light requires a continuous flow of air. If that air circulation is restricted due to the positioning of a newly installed water heater or something blocking an existing unit, the pilot light may struggle to stay on. Imagine a water heater squeezed into a tiny closet or boxes full of yard sale leftovers stacked around the appliance. With an obstructed air supply, your water heater may be unable to properly burn fuel, potentially leading to unburned fuel and/or the release of carbon monoxide into your home. This is a dangerous situation. If you suspect a lack of air is causing issues with your pilot light, it is important to consult a technician to assess the positioning of your water heater or otherwise resolve the airflow problem before attempting to relight the pilot light.

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