P03 Low

Ferroli P03 Fault Code

The Ferroli P03 fault code means: your boiler is temporarily pausing because the underfloor heating water has become slightly too hot, and it is now waiting for the system to cool down before starting up again.. 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: The underfloor heating temperature drop that lets the boiler restart after shut off when the supply became higher than the set point

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 P03 fault code

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

Source

Ferroli P03 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