Pilot Light Basics: What You Need to Know

At Pilot Plumbing, we often get questions about pilot lights—those small but essential components in many gas appliances. Understanding how they work, why they might go out, and what to do when they do is crucial for maintaining your home’s heating systems. Here’s a quick guide to the basics of pilot lights.

What Is a Pilot Light?

A pilot light is a small, continuously burning flame that ignites the main burner of a gas appliance. It’s a vital part of older gas-powered devices like water heaters, furnaces, and fireplaces.

The flame is typically found at the base of the appliance, where it lights the gas that flows to the main burner.

How Does a Pilot Light Work?

The pilot light stays lit using a small amount of gas. When the appliance needs to heat, a valve opens, allowing gas to flow to the main burner, which the pilot light then ignites. This process is crucial for the safe and efficient operation of the appliance.

In modern systems, a thermocouple or a flame sensor monitors the pilot light. If the pilot goes out, the thermocouple senses the change in temperature and shuts off the gas supply to prevent dangerous leaks.

Why Does a Pilot Light Go Out?

There are several reasons why a pilot light might go out:

1. Drafts: A gust of wind or a draft from an open window or door can blow out the pilot light.
2. Dirt or Debris: Dust and debris can clog the pilot orifice, reducing the flame's size or extinguishing it entirely.
3. Thermocouple Issues: If the thermocouple is faulty or misaligned, it may not detect the pilot light, shutting off the gas supply.
4. Gas Supply Problems: An issue with the gas supply, such as a blockage or low pressure, can cause the pilot light to go out.

How to Relight a Pilot Light

If your pilot light goes out, follow these steps to relight it:

1. Turn Off the Gas: Locate the gas valve on your appliance and turn it to the "Off" position. Wait a few minutes to allow any lingering gas to dissipate.

2. Locate the Pilot: Find the pilot light assembly, typically located near the bottom of the appliance.

3. Set the Valve to "Pilot": Turn the gas valve to the "Pilot" position. Hold down the reset button to start the flow of gas to the pilot.

4. Ignite the Pilot: While holding the reset button, use a long lighter or match to ignite the pilot light. Once the flame is steady, continue holding the reset button for about 30 seconds to ensure the thermocouple registers the flame.

5. Turn the Valve to "On": Release the reset button and turn the gas valve to the "On" position. Your appliance should now operate normally.

When to Call a Professional

If you’ve followed these steps and the pilot light still won’t stay lit, it’s time to call a professional plumber. Persistent issues could indicate a deeper problem with the thermocouple, gas supply, or other components that require expert attention.

Understanding the basics of your pilot light can help you maintain your gas appliances and ensure they operate safely and efficiently.

At Pilot Plumbing, we’re here to help with all your plumbing and heating needs. If you’re having trouble with your pilot light or any other part of your system, don’t hesitate to reach out to our team of professionals.

Whether you’re facing a stubborn pilot light or need routine maintenance, Pilot Plumbing has the expertise to keep your home safe and warm. Contact us today to schedule a service call!