BoilerFaultCodesKeston E 11 Fault Code
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
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 7 July 2026