364 Emergency

Worcester Bosch 364 Fault Code

The Worcester Bosch 364 fault code means: your boiler has detected that an internal valve responsible for controlling gas flow is not closing correctly, meaning it is unsafe to continue operating.. It appears on 6 Worcester Bosch models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Solenoid valve ev2 leaking.

What causes the Worcester Bosch 364 fault?

Gas valve leak detected

Typical repair cost £200-350 (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 364 fault code

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

Source

Worcester Bosch 364 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