BoilerFaultCodesRemeha é3 Fault Code
Also written as 3 — same fault.
The Remeha é3 fault code means: this code is not actually an error; it simply indicates that your boiler is currently running to provide heating for your radiators.. It appears on 9 Remeha models in our database.
Technical description: operating in CH mode.
What causes the Remeha é3 fault?
This fault occurs when the boiler's main computer loses its ability to correctly monitor the electrical circuit or detects a leak of electricity to the ground. The most common reason is a component failure within the control board itself or a loose connection in the internal wiring that breaks the safety loop. In some cases, a worn-out ignition electrode can also interfere with the unit's electrical signals.
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 é3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha é3 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