Error EA, furnace attempts ignition but no flame is established, multiple retries then lockout

Safety first: Turn off power. Verify there is no smell of gas. If you smell gas, ventilate the area, do not operate electrical switches, and contact gas emergency services.

• 1. Check gas supply: Ensure the main gas cock to the furnace is fully open. Confirm that other gas appliances in the property are working.
• 2. Reset after gas interruption: If gas supply was recently interrupted, there may be air in the line. Follow the Junkers reset procedure and allow several ignition attempts to purge air, but do not exceed the recommended number of resets.
• 3. Inspect ignition system: Remove the burner cover. Check the ignition electrode for correct gap and position relative to the burner. Clean any soot or debris. Inspect the ignition cable and transformer for damage.
• 4. Gas valve check: A qualified technician should measure gas inlet and outlet pressures and verify that the gas valve opens during ignition. If the valve does not open or is stuck, it must be replaced.
• 5. Combustion air path: Ensure the fan runs and the flue is not blocked, as insufficient airflow can prevent ignition.
• 6. Call a professional: Gas valve and combustion adjustments must only be carried out by licensed personnel familiar with Junkers appliances.