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A gas water heater is a vital appliance in many homes, providing a continuous supply of hot water for various purposes such as bathing, cleaning, and cooking. Unlike electric water heaters, gas water heaters use natural gas or propane to heat water stored in a tank. They are often favored for their energy efficiency and ability to heat water quickly. 

However, like any appliance, this water heating system can encounter problems, particularly with ignition and sometimes, the gas water heater pilot light won’t light up. Understanding how a gas water heater works, the common issues that arise, and how to address them can save homeowners both time and money. 

This comprehensive guide delves into gas water heater ignition problems and provides solutions to get your system running efficiently again.

What is a Gas Water Heater?

A gas water heater is a device that heats water using natural gas or propane. It consists of a tank where water is stored and heated through a burner located at the base. The gas flame heats the water, which is then circulated throughout the home for various uses. 

The primary advantage of a gas water heater over electric models is its ability to heat water quickly, making it ideal for homes that require a large volume of hot water. However, due to the complexity of their design, gas water heaters can experience several issues, particularly with their ignition system.

Common Ignition Issues with Gas Water Heaters and How to Fix Them

Ignition problems are one of the most frequent issues with gas water heaters. If the burner isn’t igniting, the water won’t heat. These issues can stem from several components within the ignition process. Below are some of the most common ignition issues and ways to address them.

1. Pilot Light Won’t Stay Lit

One of the most frequent problems with older gas water heaters is the pilot light going out. The pilot light is a small flame that ignites the burner. If it doesn’t stay lit, the water heater won’t heat the water.

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2. Igniter Not Sparking (Electronic Ignition Systems)

Modern gas water heaters often have electronic ignition systems, eliminating the need for a pilot light. However, if the igniter fails to spark, the burner won’t light, and you’ll be without hot water.

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3. Thermocouple Issues

Thermocouples are safety devices that can sometimes fail or malfunction, preventing the pilot light or burner from igniting.

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4. Flame Sensor Failure

Gas water heaters with electronic ignition systems often use a flame sensor to detect if the burner is lit. A malfunctioning or dirty flame sensor can shut off the gas supply as a safety measure.

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plumbing fixing gas water heater

5. Gas Valve Problems

The gas control valve regulates the flow of gas to the pilot light and burner. A defective valve may block the gas flow, preventing ignition.

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6. Air Supply or Ventilation Problems

Proper air supply and ventilation are crucial for a gas water heater’s operation. Insufficient airflow can prevent ignition or cause the system to shut down.

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How to Know When You Need a New Hot Water Heater

Water heaters typically last 8 to 12 years. If your unit is nearing this age and experiencing frequent problems, it might be time for a replacement. Signs that you may need a new water heater include:

How Do You Know a Water Heater Is Going Bad?

gas water heater

There are several signs that a water heater is about to fail. These include:

Protect Your Plumbing with Professional Water Heater Services

Regular maintenance of your gas water heater ensures it runs efficiently and provides consistent hot water. If you’re dealing with ignition issues or suspect your water heater is near the end of its lifespan, consider consulting a professional.

Stellar Plumbing in Prescott, AZ,  offers expert water heater installation, and maintenance. Don’t let a small problem turn into a major issue—contact us today to schedule an inspection or service.