Display shows 6A, burner does not ignite, fan may run briefly

Safety: Disconnect power and close the gas valve before working on ignition components.

Steps:

• Visual check of ignition cable: Inspect the high-voltage cable from the ignition transformer/module to the electrode. Look for cracks, burn marks, or loose connections. Reseat or replace if damaged.
• Inspect electrode assembly: Remove the electrode from the burner. Check for cracked porcelain, bent rod, or heavy carbon buildup. Clean the tip and ceramic insulator with a soft cloth and fine abrasive if needed.
• Verify electrode gap: Using a feeler gauge, set the electrode gap to the value specified in the Buderus service manual for your model. Ensure the electrode tip is correctly positioned in the burner flame zone.
• Check grounding: Ensure the burner chassis and electrode bracket have a solid ground connection to the furnace frame. Tighten mounting screws and clean any rusted contact surfaces.
• Test spark (advanced): With the burner door in place and observing through the sight glass, restore power and call for heat. Listen and look for a strong, consistent spark. If no spark is visible and wiring is intact, the ignition transformer or control module may be defective.

Note: Replacement of the Buderus ignition transformer or integrated control should be done by a qualified technician due to high voltage and combustion safety requirements.