BoilerFaultCodesAlpha 0E25 Fault Code
The Alpha 0E25 fault code means: your boiler's central control computer is experiencing a critical internal failure and has stopped the system from operating to prevent further damage.. It appears on 3 Alpha models in our database.
Technical description: Main PCB fault.
What causes the Alpha 0E25 fault?
This fault occurs when the boiler's internal computer has suffered a critical hardware failure or a memory error. The most common reason is age-related wear on the electronic components or a sudden electrical surge that has damaged the delicate circuitry on the board.
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 →Alpha models that show the 0E25 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Alpha 0E25 fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026