BoilerFaultCodesWorcester Bosch E2233 Fault Code
The Worcester Bosch E2233 fault code means: your boiler has lost communication with the internal thermometer that monitors water temperature, causing the system to shut down for safety.. It appears on 1 Worcester Bosch model in our database.
Technical description: Flow temperature sensor disconnected
What causes the Worcester Bosch E2233 fault?
This fault occurs when the boiler's main computer can no longer detect a signal from the sensor that monitors how hot the water is getting. It is usually caused by the sensor failing internally due to age, or a loose connection in the internal wiring that has broken the electrical circuit. Because the boiler cannot safely monitor its own temperature, it shuts down to prevent the system from 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 E2233 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E2233 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