The lifespan of a furnace ignitor typically ranges from 3 to 5 years. However, this can vary based on several factors, including the type of ignitor, frequency of furnace use, and maintenance practices. There are two main types of furnace ignitors: hot surface ignitors and intermittent pilot ignitors. Hot surface ignitors, which are more common in modern furnaces, tend to have a shorter lifespan due to their constant exposure to high temperatures. Intermittent pilot ignitors, on the other hand, may last longer as they are not subjected to the same level of thermal stress. The frequency of furnace use also impacts the ignitor's lifespan. In regions with long, cold winters, furnaces are used more frequently, which can lead to faster wear and tear on the ignitor. Regular maintenance, such as cleaning and inspecting the furnace, can help extend the ignitor's life by ensuring it operates efficiently and reducing the risk of overheating or other issues. Environmental factors, such as dust and humidity, can also affect the lifespan of a furnace ignitor. Dust accumulation can cause the ignitor to overheat, while high humidity levels can lead to corrosion. Ensuring proper ventilation and keeping the furnace area clean can mitigate these risks. In summary, while the average lifespan of a furnace ignitor is 3 to 5 years, proper maintenance and consideration of environmental factors can help maximize its longevity. Regular inspections by a professional can also identify potential issues early, preventing premature failure and ensuring reliable furnace operation.

1. **No Heat Production**: If the furnace is not producing heat despite being turned on, the ignitor might be faulty. 2. **Frequent Cycling**: The furnace turns on and off frequently without heating the home properly, indicating a possible ignitor issue. 3. **Clicking Sound**: A clicking sound without ignition can suggest the ignitor is not functioning. 4. **Visual Inspection**: Check for visible cracks or damage on the ignitor. A damaged ignitor will not work properly. 5. **Age of Ignitor**: If the ignitor is several years old, it may have reached the end of its lifespan. 6. **Error Codes**: Modern furnaces may display error codes indicating an ignitor problem. 7. **No Glowing**: The ignitor should glow when attempting to ignite. If it doesn’t, it may be defective. 8. **Multimeter Test**: Use a multimeter to check for continuity. A lack of continuity means the ignitor is bad. 9. **Delayed Ignition**: If there is a delay in ignition, it could be due to a failing ignitor. 10. **Gas Smell**: A gas smell without ignition can indicate the ignitor is not lighting the gas. 11. **Increased Energy Bills**: A malfunctioning ignitor can cause the furnace to work inefficiently, raising energy costs. 12. **Professional Diagnosis**: If unsure, consult a professional technician for an accurate diagnosis.

Yes, you can replace a furnace ignitor yourself, but it requires caution and some basic understanding of your furnace system. First, ensure the furnace is turned off and unplugged to prevent any electrical hazards. Locate the ignitor, which is usually near the burners. Carefully remove the access panel to expose the ignitor. Identify the type of ignitor your furnace uses, typically a hot surface ignitor or a spark ignitor. Purchase the correct replacement part, ensuring it matches the specifications of the old ignitor. Disconnect the wires connected to the old ignitor, noting their positions for accurate reconnection. Remove the screws or clips holding the ignitor in place, and gently take it out, avoiding contact with the ignitor surface as oils from your skin can damage it. Install the new ignitor by securing it with screws or clips and reconnecting the wires in their original positions. Double-check all connections and ensure the ignitor is firmly in place. Replace the access panel and restore power to the furnace. Turn on the furnace and observe its operation to ensure the new ignitor is functioning correctly. If the furnace ignites and operates smoothly, the replacement was successful. If you encounter any issues or feel uncertain at any step, it is advisable to consult a professional technician to avoid potential damage or safety risks.

A furnace ignitor can fail due to several reasons: 1. **Wear and Tear**: Over time, ignitors naturally degrade due to repeated heating and cooling cycles, leading to eventual failure. 2. **Electrical Issues**: Voltage fluctuations or surges can damage the ignitor. An incorrect voltage supply can cause the ignitor to overheat and burn out. 3. **Contamination**: Dust, dirt, or debris accumulation on the ignitor can impede its function. Contaminants can cause uneven heating or prevent the ignitor from reaching the necessary temperature to ignite the gas. 4. **Moisture**: Exposure to moisture can lead to corrosion or short-circuiting of the ignitor. This is particularly common in humid environments or if there are leaks in the furnace. 5. **Improper Handling**: Physical damage during installation or maintenance, such as cracks or breaks, can render the ignitor ineffective. Handling the ignitor with bare hands can also leave oils that cause hot spots and premature failure. 6. **Manufacturing Defects**: Occasionally, ignitors may fail due to inherent defects from the manufacturing process, leading to early breakdown. 7. **Overuse**: Frequent cycling of the furnace can lead to excessive wear on the ignitor, reducing its lifespan. 8. **Poor Installation**: Incorrect installation can lead to misalignment or improper electrical connections, causing the ignitor to fail. 9. **Gas Supply Issues**: Inconsistent or insufficient gas supply can cause the ignitor to work harder than necessary, leading to premature failure. 10. **Component Failure**: Failure of related components, such as the control board or flame sensor, can indirectly cause the ignitor to fail by not providing the correct signals or conditions for ignition.

The cost to replace a furnace ignitor typically ranges from $150 to $300, including both parts and labor. The ignitor itself usually costs between $20 and $50, depending on the brand and model of the furnace. Labor costs can vary significantly based on your location and the specific HVAC service provider, generally ranging from $100 to $250. In some cases, additional costs may arise if the technician encounters complications, such as difficulty accessing the ignitor or if other components need inspection or replacement. It's also important to consider service call fees, which can range from $50 to $100, though some companies may waive this fee if you proceed with the repair. Prices can vary based on factors such as the type of furnace (e.g., gas, electric, or oil), the complexity of the system, and the time of year, as demand for HVAC services can increase during peak heating or cooling seasons. To ensure you get a fair price, it's advisable to obtain multiple quotes from reputable HVAC professionals. Additionally, some homeowners may choose to replace the ignitor themselves if they have the necessary skills and tools, which can significantly reduce costs, but this is generally recommended only for those with experience in furnace repairs.