BoilerFaultCodesBuderus 6A Fault Code
The Buderus 6A fault code means: your boiler is trying to light but cannot detect a flame, so it has shut down for safety.. It appears on 1 Buderus model in our database.
Technical description: Blinking fault code: No ionisation message after ignition
DIY fix possible
Check if other gas appliances in your home (like a hob) are working to ensure gas supply.Verify that your external gas meter has credit if you use a prepay meter.Check that the white condensate pipe leaving the boiler isn't frozen if it is winter.Try resetting the boiler using the reset button on the front panel.
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Buderus models that show the 6A fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Buderus 6A fault code information on this page is sourced and cross-checked against the official Buderus service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026