BoilerFaultCodesAlpha 0E98 Fault Code
The Alpha 0E98 fault code means: your boiler is struggling to 'talk' to its control system, which prevents it from firing up correctly.. It appears on 2 Alpha models in our database.
Technical description: Simple cascade communication error.
What causes the Alpha 0E98 fault?
This fault occurs when the boiler's control board receives conflicting information from the sensors that monitor the water temperature entering and leaving the unit. It typically happens because one of the sensors has failed internally or because a loose connection in the wiring is distorting the electrical signal. To protect the system from overheating or operating inefficiently, the boiler shuts down until the sensors provide consistent readings.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Alpha models that show the 0E98 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Alpha 0E98 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 7 July 2026