BoilerFaultCodesRemeha e3 Fault Code
Also written as E3 — same fault.
The Remeha e3 fault code means: your boiler has detected an electrical safety issue where the power supply is not properly grounded or the internal control board has failed.. It appears on 3 Remeha models in our database.
Technical description: Mains supply not correctly earthed. Control unit or earth fault
What causes the Remeha e3 fault?
This fault occurs when the boiler's internal computer detects that the electrical supply is missing a secure connection to the ground. The most common reason is a loose or corroded wire within the boiler itself, or a critical failure of the main control board which prevents it from sensing the electricity correctly.
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 e3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha e3 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