Thermocouple, which detect flame presence, often outlast igniters, lasting 5–10 years. However, a failing thermocouple can misread flame signals, causing intermittent heating. Modern silicon nitride igniters, known for durability, may extend igniter life to 7 years or more due to their resistance to thermal shock and corrosion.
Regular maintenance, such as cleaning dust from the igniter and ensuring proper gas pressure, can maximize longevity. Homeowners should schedule annual HVAC inspections to catch early signs of wear. Replacing a faulty igniter promptly prevents furnace shutdowns and potential gas leaks.
Understanding these components’ roles and lifespans empowers homeowners to maintain efficient, safe heating systems. Always consult a licensed technician for repairs to ensure safety and compliance with local codes. Stay proactive—your furnace’s reliability depends on it.
