BoilerFaultCodesFerroli F11 Fault Code
The Ferroli F11 fault code means: your boiler's internal sensor that monitors the temperature of the water returning to the unit has stopped communicating correctly, causing the system to shutdown for safety.. It appears on 6 Ferroli models in our database.
Technical description: Return sensor error – t-sensor damaged, short circuited, sensor damaged or wiring broken
What causes the Ferroli F11 fault?
This fault occurs when the boiler's internal computer loses the ability to read the temperature of the water coming back from your radiators. This is usually caused by the return sensor failing internally due to age or heat stress, or a loose connection in the wiring that prevents the signal from reaching the main control board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like F11: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Ferroli models that show the F11 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli F11 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.
- Ferroli Arena 30A manual (PDF)
- Ferroli Bluehelix HiTech RRT manual (PDF)
- Ferroli DOMINAplus F24D manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026