Cleaning a hot surface ignitor is possible if the compressed air method fails to work. Here's how to do it:
1. Safety Precautions: First, shut off the power supply to the furnace at the main breaker panel or nearby wall switch. This prevents any electrical accidents while working on the ignitor.
2. Disconnect Wires: Next, disconnect the hot surface ignitor wires. Loosen the screws on the unit and carefully lift it out. Handle the ignitor delicately as it's a fragile component, and avoid touching the element with bare hands to prevent damage.
3. Cleaning: To clean the ignitor, use an emery cloth or fine steel wool to gently rub the probe and remove any burnt carbon buildup. Ensure the element looks clean before proceeding to the next step.
4. Reinstallation: Once cleaned, carefully place the ignitor back into its position and secure it by tightening the screws. Reconnect the wires to their respective terminals.
5. Restore Power: After reinstallation, restore power to the furnace by turning on the main breaker or wall switch.
6. Test Operation: Test the ignitor by turning up the thermostat to initiate the furnace startup process. If the ignitor is functioning properly, it will ignite the gas and start the furnace.
By following these steps, you can effectively clean a hot surface ignitor and ensure the smooth operation of your furnace.