How much does it cost to fix Alpha error code 89?

Typical repair cost for the Alpha 89 fault is £150-350 including labour.

89 High

Alpha 89 Fault Code

Q: What does the Alpha 89 fault code mean?

Your boiler is struggling to keep a steady flame, causing it to shut down because it cannot safely maintain the fire needed to heat your home.

The Alpha 89 fault code means: your boiler is struggling to keep a steady flame, causing it to shut down because it cannot safely maintain the fire needed to heat your home.. It appears on 10 Alpha models in our database.

Technical description: Flame signal unstable. A malfunction of one of the components of the air/gas circuit - the flame is unstable

Typical repair cost £150-350 (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 89 fault code

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

Source

Alpha 89 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