Goodman Ignitor(40)

Several signs can point to a failing furnace ignitor:

• The blower runs but air stays cool or burners never ignite.
• You don’t see the typical orange glow at startup.
• The furnace tries to start several times, then shuts down.
• Visible cracks, chips, or chalky white spots on the ignitor element.
• A continuity test (with power off) shows an open circuit.

Ignition issues can also be caused by sensors, controls, or airflow. Check your filter and thermostat settings first. If you smell gas or aren’t comfortable troubleshooting, leave the area and contact a licensed technician. When ready to replace, match the ignitor to your unit’s exact part number.

Hot surface ignitors can fail for a few common reasons:

• Thermal fatigue: The element weakens after repeated heat cycles.
• Contamination: Skin oils or dust can create hot spots and early burnout.
• Handling damage: The ceramic/silicon element is brittle and can crack.
• Electrical issues: Loose harnesses, poor grounding, or voltage irregularities.
• Compatibility: Wrong connector, bracket, or type results in improper fit or placement.

Using the correct part number and avoiding touching the element during install can help reduce issues. If problems continue, the root cause may lie elsewhere, such as a sensor or control board. A professional diagnosis can help prevent repeat failures.

Here’s a general approach to replacing a furnace ignitor:

1. Switch off power at the furnace switch and breaker. Let the unit cool.
2. Remove the access panel and locate the ignitor near the burners.
3. Take a photo of wiring and mounting for reference.
4. Unplug the harness and remove mounting screw(s). Avoid touching the element.
5. Install the new ignitor in the same orientation using the existing bracket.
6. Reconnect the harness, replace the panel, restore power, and test a heat cycle.

Models vary, so follow your owner’s manual. If the ignitor glows but burners don’t light, shut the system down and contact a licensed technician. You can find compatible options by matching your original part number.

For a basic check, turn off power and let the furnace cool.

1. Disconnect the ignitor’s plug so you’re testing the part alone.
2. Set a multimeter to resistance (ohms) and place leads on the terminals.
3. A steady resistance reading indicates continuity; an open reading (OL) often suggests failure.
4. Inspect for cracks, chips, or burned spots and verify the harness connection.

Exact resistance values vary by ignitor type; consult your service manual for specifications. Avoid live-voltage testing unless you’re trained. If the ignitor tests good, the issue could be elsewhere (sensor, control, or fuel supply). Replacement ignitors are available here—just match your unit’s exact part number.

Fitment is about matching what your system was built for:

• Locate the furnace model and the existing ignitor’s part number (label or manual).
• Match the connector style, mounting bracket, and lead length.
• Confirm the ignitor type and required voltage per your documentation.
• Compare product photos and specs to mirror your original part.

Using the exact part number is the simplest way to avoid returns. On Walmart, you can review specs and choose convenient pickup or delivery at checkout. If you’re unsure, a licensed HVAC technician can confirm compatibility before you order.