BoilerFaultCodesAlpha 0E98 Fault Code
The Alpha 0E98 fault code means: your boiler is struggling to talk to the control system or other connected units, causing it to pause operations to prevent errors.. It appears on 3 Alpha models in our database.
Technical description: Flow and return sensor anomaly detected (sensor shows incorrect temperature value)
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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Gas Safe Register →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 27 April 2026