Because natural gas doesn’t possess any latent heat, gas furnaces need an ignition system to combust the gas and create heat for your home. Your furnace ignitor is a key component that ensures gas furnaces work safely and efficiently. If the ignitor is damaged or malfunctioning, your furnace could run poorly or in some cases not at all. How can you tell if your furnace ignitor is faulty?
Diagnosing the problem depends on the type of furnace ignitor you have. While old furnaces might have a standing pilot light, electronic ignitors are the most likely type for modern gas furnaces. We’ll go over the differences in each type as well as how a faulty ignitor affects your furnace and what components can keep the ignitor from working.
Your furnace ignitor is a key component in the heating process. It provides the heat necessary to combust the furnace’s natural gas supply. This heat is sent into the HVAC system’s air handler before moving into your ductwork. Without the furnace ignitor, your heating might as well be an expensive fan.
Older furnaces used to have a standing pilot light to keep the gas lit. This tiny flame would remain lit even between heating cycles. Modern furnaces have moved on to an electronic ignition system, and these ignitors are safer and more energy efficient. The two most popular types of electronic furnace ignitor are:
Your furnace likely has one of these electronic ignitors. Since they’re housed inside the furnace, damage or component failure isn’t always obvious. Instead, the furnace may stop running like it does normally. This is often the first sign you have a faulty furnace ignitor.
A faulty furnace ignitor can affect normal operation in multiple ways. These range from keeping the furnace from running entirely to constant cycles of starting and stopping. Have you noticed your furnace acting in any of the following ways?
The furnace won’t start: Combusting natural gas can be hazardous, especially if a component of the furnace isn’t operating properly. When the ignitor is malfunctioning, safety features will stop the furnace from running entirely to prevent further damage or additional problems.
The furnace blows cool air: Unheated air coming through your ductwork is a clear sign something is malfunctioning. The furnace may not recognize that the ignitor is malfunctioning and other components like the air handler will work as normal.
The furnace is short cycling: This frustrating problem means the furnace’s heating cycles are too short or repetitive. Not only will it be inadequate for heating your home, but it puts extra strain on the furnace itself. Short cycling can occur when the furnace ignitor switches on and off, which activates the safety features and shuts the furnace off.
In other cases, the ignitor won’t work because another element of your furnace is malfunctioning. When making a furnace repair call, professional technicians in the U.S. might inspect the following components as well:
Calling a professional technician for furnace repair in the U.S. is the fastest way to resolve a problem with the furnace ignitor. They’ll have the tools and training to narrow down possible causes and can start with the most obvious culprits. Over the course of diagnostics, the technician may do several things, including:
Costs can vary depending on the model of both the furnace and the electronic ignitor. With parts and labor, homeowners can expect to spend around $100 to $350 on replacement costs. The average life span of the furnace ignitor is seven7 years, so in some cases the problem is a result of the ignitor simply becoming too old to function correctly. Whatever the problem is, a certified technician can find the source and offer the most cost-effective solutions.
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