BoilerFaultCodesWorcester Bosch E2222 Fault Code
The Worcester Bosch E2222 fault code means: your boiler has stopped working because its internal thermometer has developed an electrical fault and can no longer tell how hot the water is.. It appears on 3 Worcester Bosch models in our database.
Technical description: Short circuit in the flow temperature sensor contacts
What causes the Worcester Bosch E2222 fault?
This fault occurs when the sensor responsible for measuring the temperature of the water leaving the boiler fails to send a clear signal to the control board. It is typically caused by the internal electrical contacts within the sensor wearing out or moisture causing a connection to fail, meaning the boiler can no longer operate safely. In some cases, the wiring connecting the sensor to the main computer may have become loose or damaged 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 E2222 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E2222 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