BoilerFaultCodesWorcester Bosch E2223 Fault Code
The Worcester Bosch E2223 fault code means: your boiler has lost connection with a internal sensor that monitors water temperature, meaning it cannot safely heat your home until the connection is restored.. It appears on 1 Worcester Bosch model in our database.
Technical description: The flow temperature sensor contacts have been interrupted
What causes the Worcester Bosch E2223 fault?
This fault occurs when the boiler's main control board loses electrical contact with the sensor that monitors the temperature of the water leaving the unit. The most common reason is a physical failure of the internal sensor's sensitive components or a loose connection in the wiring harness caused by natural heat expansion and vibration over time.
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 E2223 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E2223 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