How much does it cost to fix Keston error code E 11?

Typical repair cost for the Keston E 11 fault is £250-450 including labour.

E 11 High

Keston E 11 Fault Code

Q: What does the Keston E 11 fault code mean?

Your boiler's internal computer has encountered a critical error and needs to be reset or potentially replaced to get your heating and hot water working again.

Also written as E11 — same fault.

The Keston E 11 fault code means: your boiler's internal computer has encountered a critical error and needs to be reset or potentially replaced to get your heating and hot water working again.. It appears on 3 Keston models in our database.

Technical description: Internal electronics error - rest or replace control box

Typical repair cost £250-450 (including labour)

Engineer required

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

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Keston models that show the E 11 fault code

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

Source

Keston E 11 fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026