EA 234 High

Worcester Bosch EA 234 Fault Code

Also written as EA234 — same fault.

The Worcester Bosch EA 234 fault code means: your boiler has stopped working because the internal control board has lost communication with the gas valve, meaning it cannot safely light the flame.. It appears on 10 Worcester Bosch models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The contacts of the gas valve have been interrupted
Typical repair cost £180-£450 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the EA 234 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch EA 234 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