38 High

Alpha 38 Fault Code

The Alpha 38 fault code means: your boiler has started an ignition process but lost its flame unexpectedly, causing the system to shut down for safety.. It appears on 24 Alpha models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Loss of flame rectification

What causes the Alpha 38 fault?

This fault occurs when the boiler successfully lights the burner but fails to detect a consistent flame signal shortly after. The most common reasons are a worn-out sensing probe that can no longer 'see' the fire, or an unstable gas supply preventing a steady flame from being maintained.

This fault can appear more frequently during the first cold snap of autumn when the gas valve or electrodes struggle to operate after sitting idle all summer.

Typical repair cost £100-280 (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 38 fault code

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

Source

Alpha 38 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