P12 Low

Ferroli P12 Fault Code

The Ferroli P12 fault code means: your boiler is currently performing a scheduled high-temperature cycle to ensure your hot water storage is free from bacteria.. It appears on 1 Ferroli model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Goal temperature when water tank sterilization

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 P12 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ferroli P12 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026