BoilerFaultCodesRemeha 15 Fault Code
The Remeha 15 fault code means: your boiler’s internal computer has developed a serious electronic fault and can no longer control the heating process safely.. It appears on 2 Remeha models in our database.
Technical description: Control box failure
What causes the Remeha 15 fault?
This fault occurs when the boiler's internal computer suffers an electrical failure and can no longer process data or safety checks correctly. The most common reason is a short circuit or component degradation on the printed circuit board, often caused by age or power surges from the mains supply.
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 15 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha 15 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