BoilerFaultCodesRemeha é11 Fault Code
Also written as 11 — same fault.
The Remeha é11 fault code means: your boiler has detected that hot combustion gases are leaking into the internal casing, which is a serious safety concern that prevents the appliance from operating correctly.. It appears on 4 Remeha models in our database.
Technical description: Air box temperature too high; Air leakage from heat exchanger to air box
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Remeha models that show the é11 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha é11 fault code information on this page is sourced and cross-checked against the official Remeha service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026