BoilerFaultCodesRemeha 4) Fault Code
Also written as 4 — same fault.
The Remeha 4) fault code means: your boiler's computer has lost its specific configuration settings, meaning it doesn't know how to operate correctly and has shut down as a precaution.. It appears on 6 Remeha models in our database.
Technical description: Setting failure
What causes the Remeha 4) fault?
This fault occurs when the boiler's internal memory becomes corrupted or disconnected, causing it to lose the vital instructions needed to run safely. The most common reason is a failure of the main control board or a loose connection with the parameter plug, which acts like a small memory stick containing the unit's identity.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Remeha models that show the 4) fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha 4) 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 27 April 2026