How to check and replace Gas Furnace Igniter?

To check and replace a gas furnace igniter, you can follow these general steps:

1. Turn off the power: Before you start any work on the furnace, turn off the power supply to ensure your safety. Locate the furnace switch on the electrical panel and flip it to the off position.

2. Access the igniter: Depending on the furnace model, you may need to remove the furnace access panel or front cover to access the igniter. Consult the furnace's user manual or refer to manufacturer instructions for proper access.

3. Locate the igniter: The igniter is usually located near the burners. It may be attached to the furnace assembly by a bracket or wires. Take note of how the igniter is positioned before removing it.

4. Inspect the igniter: Visually inspect the igniter for any signs of damage, such as cracks or breaks. A damaged or defective igniter is likely the cause of the furnace not igniting or heating properly.

5. Test the igniter: If the igniter appears intact, you can use a multimeter set on the resistance or continuity setting to test it. Follow the manufacturer's instructions or refer to the furnace's user manual for the specific resistance values or continuity requirements of the igniter. If the igniter does not pass the test, it needs to be replaced.

6. Disconnect and replace the igniter: If the igniter is faulty, disconnect any wires or connectors attached to it. Take caution not to damage any other furnace components during this process. Install the new igniter in the same position and reconnect any wiring or connectors.

7. Reassemble and restore power: Put back any removed panels or covers, ensuring they are secure. Once everything is in place, turn the power supply back on by flipping the furnace switch on the electrical panel.

8. Test the furnace: Set the thermostat to a higher temperature than the current room temperature and check if the furnace ignites and heats up properly. Observe the igniter during the ignition process to ensure it functions correctly.

It's important to note that furnace models may vary, and specific instructions may differ. Always follow the manufacturer's instructions and safety guidelines or consider seeking professional assistance if needed.