BoilerFaultCodesFerroli A56 Fault Code
The Ferroli A56 fault code means: your boiler is failing to light because it cannot detect the flame, likely due to a sensor needing cleaning or replacement.. It appears on 4 Ferroli models in our database.
Technical description: Electrode damaged or not correctly positioned
What causes the Ferroli A56 fault?
This fault occurs when the boiler's internal computer is unable to verify that the gas and air are mixing in the correct proportions for a safe flame. It is usually triggered because the sensors aren't detecting a consistent signal during the start-up phase or the gas valve isn't responding correctly to the calibration commands. This prevents the boiler from firing up to ensure no unburnt gas or dangerous fumes are produced.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Ferroli models that show the A56 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli A56 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.
- Ferroli Bluehelix Pro RRT manual (PDF)
- Ferroli Bluehelix Tech manual (PDF)
- Ferroli Bluehelix Tech RRT manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026