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 10 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 27 April 2026