BoilerFaultCodesWorcester Bosch EA261 Fault Code
The Worcester Bosch EA261 fault code means: your boiler's internal computer brain has encountered a communication error and is preventing the system from starting for safety.. It appears on 2 Worcester Bosch models in our database.
Technical description: Heat control module (HCM) potentially defective – reset the appliance
What causes the Worcester Bosch EA261 fault?
This fault occurs when the boiler's main control board loses its connection with the internal identity chip that stores the appliance's specific settings. It is often caused by a temporary electronic glitch or a physical failure of the heat control module itself, which prevents the boiler from knowing how to safely fire up. Because the brain cannot verify the boiler's hardware, it shuts down the system as a safety precaution.
DIY fix possible
Locate the 'Reset' button on the boiler control panelPress and hold the button for five secondsWait for the boiler to restart; if the code clears, monitor for recurrence
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Gas Safe Register →Worcester Bosch models that show the EA261 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch EA261 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