Why won't pilot light stay lit?

Why Won't Pilot Light Stay Lit?

A pilot light is a small flame that is continuously burning in various appliances, such as gas furnaces, water heaters, and stoves. Its purpose is to ignite the main burner when needed. However, sometimes the pilot light may fail to stay lit, which can be frustrating and potentially dangerous. Understanding the potential causes can help troubleshoot and resolve this issue.

Possible Causes

1. Thermocouple Malfunction: One of the most common reasons for a pilot light going out is a malfunctioning thermocouple. A thermocouple is a heat-sensitive device that generates an electric current to keep the gas valve open when the pilot light is on. If the thermocouple is faulty or dirty, it may not generate enough electricity to keep the valve open, causing the pilot light to extinguish.
2. Gas Pressure Issue: Another reason could be an irregular gas supply pressure. If the gas pressure is too low, it may not provide enough fuel to sustain the pilot light. Conversely, if the pressure is too high, it may create an intense flame that blows the pilot light out. Gas pressure-related issues should be handled by a professional technician.
3. Dirty Pilot Tube: Accumulated dirt or debris in the pilot tube can obstruct the flow of gas to the pilot light. This can cause the flame to go out shortly after being ignited. Cleaning the pilot tube using compressed air or a needle can often resolve this issue.
4. Improperly Positioned Thermocouple: The position of the thermocouple in relation to the pilot flame is crucial. If it is not correctly positioned in the flame, it may not be able to generate enough electricity to keep the gas valve open. Adjusting the position of the thermocouple may resolve the problem.
5. Drafts and Ventilation: Strong drafts or inadequate ventilation in the area where the appliance is installed can blow out the pilot light. Ensure that doors, windows, and vents are properly sealed and that there isn't any disruptive air movement around the pilot light.

Steps to Troubleshoot

When troubleshooting a pilot light that won't stay lit, you can follow these steps:

1. Turn off the gas supply and wait for a few minutes to ensure gas has dissipated from the area.
2. Carefully remove any coverings or panels to access the pilot light and its associated components.
3. Clean the area around the pilot light, removing any dirt or debris that may obstruct its operation.
4. Check the thermocouple for proper position and cleanliness. If necessary, adjust its position or clean the sensor gently using a cloth and alcohol.
5. Inspect the pilot tube for blockages and clean it using compressed air or a needle if needed.
6. Ensure the gas supply pressure is within the recommended range by contacting a professional technician.
7. Check for any drafts or ventilation issues near the appliance and resolve them if necessary.
8. Reassemble the appliance and relight the pilot according to the manufacturer's instructions.

If these troubleshooting steps do not resolve the issue, it is recommended to consult a trained technician or contact the manufacturer for further assistance. They will be able to diagnose and repair the problem effectively.

Disclaimer: The information provided in this article serves as a general guide. It is important to refer to the specific appliance's manual and consult professionals if needed.