BoilerFaultCodesWorcester Bosch EA234 Fault Code
The Worcester Bosch EA234 fault code means: your boiler has lost its connection to the gas valve, meaning it cannot light the flame to provide heating or hot water.. It appears on 1 Worcester Bosch model in our database.
Technical description: The contacts of the gas valve have been interrupted
What causes the Worcester Bosch EA234 fault?
This fault occurs when the boiler's central brain loses electrical communication with the gas valve, which acts as the fuel tap for the appliance. The most common reason is a loose connection or a break in the internal wiring, though it can also be triggered by a mechanical failure within the valve itself or a fault on the main circuit board.
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 EA234 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch EA234 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