CE Low

Alpha CE Fault Code

The Alpha CE fault code means: your boiler is receiving an incorrect signal from an optional external weather sensor, which means it cannot accurately adjust its temperature based on outdoor conditions.. It appears on 6 Alpha models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: External sensor correction value is over +9 (for external control connection only used with system supervisor connection).
Typical repair cost £100-£200 (including labour)

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 CE fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Alpha CE 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