F13 High

Ferroli F13 Fault Code

The Ferroli F13 fault code means: your boiler's internal temperature sensor has stopped sending the correct information to the control board, preventing the system from operating safely.. It appears on 12 Ferroli models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Exchanger probe error – t-sensor damaged, short circuited, sensor damaged or wiring broken

What causes the Ferroli F13 fault?

This fault occurs when the sensor responsible for monitoring the heat exchanger's temperature fails to communicate with the main control board. The most common reason is that the sensor has physically degraded or developed a short circuit, meaning the boiler can no longer verify if it is operating at a safe temperature. In some cases, the error is caused by loose or damaged wiring connecting the sensor to the brain of the boiler.

Typical repair cost £90-160 (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 F13 fault code

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

Source

Ferroli F13 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