Clean the burner assembly

What is going on

Clean the burners and crossovers after removing the burner and manifold assembly.

Likely causes

• Foreign matter blocking the burner ports or crossovers

Check in this order

1. Turn off gas and electrical power and remove the heating compartment access panel.
2. Disconnect and label the gas valve, ignitor, rollout switch, flame sensor and ground wires.
3. Disconnect the gas supply line from the gas valve.
4. Remove the four screws holding the burner and manifold assembly to the vestibule. Do not let the ignitor plate dislodge.
5. Gently vacuum the burner faces with a soft brush attachment.
6. Check inside the burners and crossovers for blockage and clear any found.
7. Reinstall the assembly with the existing four screws, reconnect all wires and the gas line.
8. Verify gas and electrical connections, then run the furnace for 5 minutes and replace the access panel.

More furnace guides

• Annual planned service inspection
• Annual service checklist
• Blower access panel and carbon monoxide hazard
• Burner assembly cleaning
• Change blower speed tap
• Check temperature rise and adjust blower speed