Furnace shows EA; burner shuts down and locks out

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Unstable gas supply pressure, Blocked burner or incorrect combustion air, Faulty ionization electrode, Loose ground connection

Safety: Turn off power and gas before internal inspection.

Grounding: Verify the furnace is properly grounded. Tighten the earth/ground screw and ensure the burner assembly has a solid metal-to-metal connection.
Electrode cleaning: Clean the ionization electrode and check its position in the flame.
Burner cleaning: Remove surface rust and debris from the burner. Vacuum dust from the combustion chamber.

If EA recurs, a technician should check gas pressure, combustion settings, and possibly replace the gas valve or control board.

Hard 4/5

Ionization Electrode

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