A furnace ignitor typically has a life expectancy of 3 to 5 years.
Understanding Your Furnace Ignitor
The ignitor is a crucial component in modern gas furnaces. Its primary role is to ignite the gas burners, initiating the heating process. When the thermostat calls for heat, the ignitor glows red, reaching high temperatures, which then ignites the gas flowing into the furnace's burners.
Why Ignitors Have a Limited Lifespan
The limited lifespan of a furnace ignitor is primarily due to the constant thermal stress it undergoes. Each time the furnace cycles on, the ignitor rapidly heats up to a glowing red temperature and then cools down once the burners are lit. This continuous cycle of extreme heating and cooling creates significant stress on the ignitor's element. Over time, this stress leads to material fatigue, causing the ignitor to degrade and eventually crack. When an ignitor cracks, it can no longer generate the necessary heat to ignite the gas, leading to a furnace malfunction.
Expected Lifespan Summary
| Component | Average Life Expectancy | Contributing Factor |
|---|---|---|
| Furnace Ignitor | 3-5 years | Repeated heating and cooling cycles; material stress |
Signs Your Ignitor May Need Replacement
Recognizing the signs of a failing ignitor can help you address issues before your furnace completely stops working. Common indicators include:
- No Heat: The furnace turns on, but no heat is produced because the burners aren't lighting.
- Clicking Sounds: You might hear the furnace trying to ignite, often accompanied by clicking, but without the whoosh of the burners lighting.
- Error Codes: Many modern furnaces display error codes related to ignition failure. Consult your furnace manual for specific codes.
- Visible Cracks: In some cases, a visual inspection by a qualified technician may reveal cracks or damage to the ignitor element.
Regular inspections by a qualified HVAC technician can help identify a worn-out ignitor before it completely fails, ensuring your furnace remains reliable, especially during colder months.
