P04 Low

Ferroli P04 Fault Code

The Ferroli P04 fault code means: your boiler is temporarily pausing because the water in the tank has become too hot and now needs to cool down slightly before the system can restart automatically.. 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 tank 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 P04 fault code

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

Source

Ferroli P04 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