According to the Gas Furnace Guide, ignitors have an average lifespan of four to seven years. So, after about seven years, you may have to replace the ignitor; however, you probably won't have to replace the entire furnace because other parts, such as the heat exchanger, can last more than 15 years.
How do I know if my furnace ignitor is bad?
4 Signs of a Faulty Furnace Ignitor
- The Furnace Stops Running. When a furnace won't run at all, check for a bad ignitor. ...
- Your Furnace Blows Chilly Air. Unless you've set your thermostat to COOL, your furnace should not blow cold air. ...
- Does Your Furnace Short Cycle? ...
- A No Glow Ignitor. ...
- We Can Replace Your Furnace Ignitor.
What makes an ignitor go bad?
Most of the time when ignitors go bad that often it is because the ignitor is not shutting off after the gas in the furnace is ignited. If the ignitor stays on for an extended period of time this will make the ignitor short-lived.
