BoilerFaultCodesWorcester Bosch E2351 Fault Code
The Worcester Bosch E2351 fault code means: your boiler has lost its connection to the component that monitors water temperature, meaning it cannot safely heat your home or water until the connection is restored.. It appears on 1 Worcester Bosch model in our database.
Technical description: Flow temperature sensor disconnected
What causes the Worcester Bosch E2351 fault?
This fault occurs when the boiler's main computer loses electrical communication with the sensor that monitors how hot the water is. The most common reason is that the sensor itself has suffered an internal failure, though it can also be caused by a loose connection or damaged wiring. Because the boiler no longer knows the water temperature, it shuts down as a safety precaution to prevent overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the E2351 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E2351 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 27 April 2026