How to Fix / Troubleshooting

Safety: Turn off power and close the oil valve. Wait for the burner to cool.

Steps:

Inspect and adjust electrodes: Remove the burner and access the electrode assembly. Clean electrodes with fine abrasive. Set the gap and projection according to the Riello service manual for your burner model.
Clean combustion head: Remove soot and debris from the head, diffuser disk, and air slots. Ensure the head is correctly positioned on the blast tube.
Check ignition transformer: Inspect for cracks, oil leakage, or burnt smell. Verify tight high-voltage connections. If spark is weak or intermittent, the transformer may need replacement.
Verify photocell alignment: Ensure the flame sensor has a clear line of sight to the flame area and is fully seated in its holder.

If A06 continues, professional testing of ignition voltage and combustion setup is recommended.

Burner attempts to start but shuts down with code indicating ignition failure or no flame detected

Possible Causes