F 1 4 Low

Ferroli F 1 4 Fault Code

Also written as F14 — same fault.

The Ferroli F 1 4 fault code means: your boiler is struggling because it has lost the signal from an optional outdoor temperature sensor, so it is reverting to a simplified operating mode.. 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: External probe faulty
Typical repair cost £100-180 (including labour)

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 F 1 4 fault code

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

Source

Ferroli F 1 4 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