How much does it cost to fix Worcester Bosch error code H11?

Typical repair cost for the Worcester Bosch H11 fault is £120-180 including labour.

H11 Low

Worcester Bosch H11 Fault Code

Q: What does the Worcester Bosch H11 fault code mean?

Your boiler has identified a minor fault with a sensor that monitors the incoming mains cold water, but your heating and hot water will continue to work absolutely fine.

The Worcester Bosch H11 fault code means: your boiler has identified a minor fault with a sensor that monitors the incoming mains cold water, but your heating and hot water will continue to work absolutely fine.. It appears on 4 Worcester Bosch models in our database.

Technical description: DCW in sensor defect, (appliance operation not affected)

Typical repair cost £120-180 (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 H11 fault code

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

Source

Worcester Bosch H11 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