BoilerFaultCodesWorcester Bosch +F Fault Code
Also written as F — same fault.
The Worcester Bosch +F fault code means: your boiler has detected that a safety sensor meant to monitor heat levels may be faulty or disconnected, so it has shut down to prevent any risk of overheating.. It appears on 2 Worcester Bosch models in our database.
Technical description: Safety temperature sensor fault
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Worcester Bosch models that show the +F fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch +F fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026