How to Light a Gas Furnace With Electronic Ignition: A Comprehensive Guide

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Introduction: Gas Furnaces With Standing Pilot Lights Versus Electronic Ignition Systems

Gas furnaces have long been a mainstay in American households, but the traditional method of using standing pilot lights is becoming outdated. Nowadays, most natural gas furnaces are equipped with electronic ignition systems, which offer improved energy efficiency and reliability.

The problem with standing pilot lights lies in their constant consumption of gas, even when the furnace is not in use. This not only leads to unnecessary energy consumption but also results in higher utility bills. Moreover, standing pilot lights are more prone to reliability issues as they can easily be extinguished by drafts or clogged with soot and debris.

Fortunately, electronic ignition systems provide a better solution. These systems come in two main types: hot surface ignition and intermittent pilots. Hot surface ignition involves the use of an electric current passing through a metal probe located near the burners. This causes the probe to become hot and effectively ignite the burners. On the other hand, intermittent pilots use a pilot light that only activates when heating is required. This pilot light is ignited by an electric spark, ensuring efficiency and reliability.

To summarize:

• Gas furnaces have transitioned from relying on standing pilot lights to using electronic ignition systems.
• Standing pilot lights consume energy and can cause higher utility bills.
• Electronic ignition systems offer improved energy efficiency and reliability.
• Hot surface ignition and intermittent pilots are the two main types of electronic ignition systems.

“Gas furnaces have transitioned from relying on standing pilot lights to using electronic ignition systems for improved energy efficiency and reliability.”

Types Of Electronic Ignition Systems: Hot Surface Ignition And Intermittent Pilots

Hot surface ignition and intermittent pilot systems are the two main types of electronic ignition systems used in gas furnaces.

Hot surface ignition works by using an electric current to heat a metal probe positioned near the burners. The metal probe, often made of silicon nitride or silicon carbide, becomes red hot and ignites the burners.

This type of ignition system is highly reliable and does not require a constant pilot light.

On the other hand, intermittent pilot systems rely on a pilot light that is only ignited when the thermostat calls for heat. When the thermostat signals a need for heating, an electric spark is generated to ignite the pilot light, which then ignites the main burners.

This system also provides reliable ignition while reducing gas consumption and energy waste.

• Hot surface ignition: use electric current to heat metal probe near burners
• Intermittent pilot systems: rely on pilot light ignited by thermostat signal
• Both systems provide reliable ignition
• Hot surface ignition eliminates need for constant pilot light
• Intermittent pilot systems reduce gas consumption and energy waste

“Hot surface ignition and intermittent pilot systems are the two main types of electronic ignition systems used in gas furnaces.”

Safety Measures For Electronic Ignition Systems

Both hot surface ignition and intermittent pilot systems incorporate safety measures to avoid the release of gas in the absence of ignition. This is crucial for preventing gas leaks and potential hazards associated with uncontrolled gas flow.

In hot surface ignition systems, the gas valve remains closed if the igniter fails or malfunctions. Consequently, no gas is allowed to flow without an active flame for ignition. This safety feature ensures that gas is only released when there is a flame present.

Similarly, intermittent pilot systems rely on a flame sensor to confirm the presence of the pilot light before permitting the main burners to ignite. Should the flame sensor fail to detect a flame, the gas valve remains closed, preventing any gas from being released.

These safety measures offer homeowners peace of mind, assuring them that their gas furnace poses no risks or hazards if proper ignition is not achieved.

Benefits Of Replacing Old Furnaces With Standing Pilot Lights

If you have a gas furnace with a standing pilot light that is over 15 years old, it is highly recommended to replace it with a newer model that uses electronic ignition. There are several benefits to making this upgrade.

First and foremost, gas furnaces with electronic ignition are far more energy efficient. By eliminating the constant burning of a standing pilot light, these furnaces consume less gas, resulting in lower utility bills and reduced energy waste.

In addition to energy efficiency, electronic ignition systems offer increased reliability. Standing pilot lights can easily become extinguished by drafts or become clogged with soot and debris, leading to heating issues. Electronic ignition eliminates these common problems and ensures a dependable heat source whenever needed.

Lastly, replacing an old gas furnace with electronic ignition provides longevity and peace of mind. These newer systems are built with advanced technology and are designed to withstand the test of time. With regular maintenance and care, they can provide efficient and reliable heating for many years to come.

Manual Ignition For Electronic Ignition Systems

While electronic ignition systems for gas furnaces are generally reliable, there may be occasions where the igniter fails to function correctly. In such situations, there is a simple method to manually light the furnace.

To manually light a gas furnace with electronic ignition, follow these steps:

• Turn the thermostat to the lowest setting and cut off the power to the furnace. This can be done by flipping the furnace’s power switch or turning off the circuit breaker.
• Wait for a few minutes to allow the gas to clear.
• Switch the igniter back on and restore power to the furnace.
• Observe the pilot light reigniting and heating up the main burners.

It is important to note that manually lighting the furnace should only be considered as a temporary solution. If the electronic ignition system continues to have issues, it is highly recommended to seek the assistance of a professional HVAC technician.

Troubleshooting Common Issues With Electronic Ignition Systems

While electronic ignition systems are generally reliable, there may be occasions when they encounter common issues. Here are some troubleshooting steps you can take if you are experiencing problems with your electronic ignition system.

• If the pilot light fails to ignite, try reigniting it by turning off the furnace and the gas supply. Wait for a few minutes to allow the gas to dissipate before attempting to reignite the pilot light. Follow the manufacturer’s instructions for your specific furnace model to reset and reignite the pilot light.

• Check the air filters in your furnace. Dirty or clogged air filters can restrict airflow, leading to issues with the electronic ignition system. Clean or replace the air filters as necessary to ensure proper airflow.

• Inspect the igniter for any buildup of debris or residue. The presence of dirt or debris can prevent the igniter from functioning effectively. Clean the igniter carefully with a soft brush or cloth to remove any obstructions.

If you have attempted these troubleshooting steps and the electronic ignition system still fails to work properly, it is advisable to contact a professional HVAC technician. They have the expertise and tools necessary to diagnose and resolve complex issues with electronic ignition systems.

Frequently Asked Questions

What is the electronic ignition of a gas furnace?

The electronic ignition of a gas furnace is a mechanism that is responsible for igniting the gas fuel in the furnace. It consists of either an intermittent pilot or a hot surface ignition system. In the intermittent pilot system, a high voltage electrical spark is generated whenever the thermostat signals for heat. This spark ignites a gas pilot, initiating the combustion process. On the other hand, the hot surface ignition system uses a heated surface element to ignite the gas, eliminating the need for a pilot light. Regardless of the type, these electronic ignition systems effectively and efficiently start the heating process in gas furnaces.

How does electronic ignition work on furnace?

Electronic ignition in furnaces works by using an electric current to heat a metal probe positioned above the burners. This current causes the probe to become hot, similar to how filaments in a light bulb glow when current passes through them. As the probe heats up, it ignites the fuel in the burners, allowing the furnace to start and provide heat to the home. This type of ignition has become the most common in modern furnaces due to its efficiency and reliability.

Do furnaces have electronic ignition?

Yes, furnaces do have electronic ignition systems. Unlike their older counterparts that relied on a constantly burning pilot flame, modern furnaces are equipped with electronic ignition systems. These systems require minimal power to operate and are commonly found in new furnaces. However, it’s worth noting that there are different types of electronic ignition systems, with some still utilizing a pilot flame to ignite the gas burners. The incorporation of electronic ignition has improved the efficiency and reliability of furnaces, making them a popular choice in modern heating systems.

Does a furnace with electronic ignition have a pilot light?

Furnaces with electronic ignition do not have a pilot light. Instead, they utilize a different method of ignition. Similar to the concept of a lightbulb, the electronic ignition system causes a filament to become intensely hot as electric current passes through it. This heat is then used to ignite the gas jets, eliminating the need for a traditional pilot light. This advancement in technology has led to furnaces that are not only more energy efficient but also more reliable and safe.

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