How much does it cost to fix Alpha error code 93?

Typical repair cost for the Alpha 93 fault is £120-250 including labour.

93 High

Alpha 93 Fault Code

Q: What does the Alpha 93 fault code mean?

Your boiler has detected an issue with the flame intensity that falls outside of its normal operating settings, causing it to shut down for safety reasons.

The Alpha 93 fault code means: your boiler has detected an issue with the flame intensity that falls outside of its normal operating settings, causing it to shut down for safety reasons.. It appears on 10 Alpha models in our database.

Technical description: Flame signal beyond limit - The flame signal is beyond the adjustment range required for a limited period of time

Typical repair cost £120-250 (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 93 fault code

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

Source

Alpha 93 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