How much does it cost to fix Ideal error code L A (flashing)?

Typical repair cost for the Ideal L A (flashing) fault is £120-250 including labour.

L A (flashing) High

Ideal L A (flashing) Fault Code

Q: What does the Ideal L A (flashing) fault code mean?

Your boiler has switched itself off because it has detected an unsafe build-up of heat, requiring a professional to check for internal circulation or sensor issues.

Also written as LAFLASHING — same fault.

The Ideal L A (flashing) fault code means: your boiler has switched itself off because it has detected an unsafe build-up of heat, requiring a professional to check for internal circulation or sensor issues.. It appears on 2 Ideal models in our database.

Technical description: Boiler is not working for central heating or hot water and the display shows ‘L A’ (flashing). If fault recurs this indicates an overheat condition.

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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Ideal models that show the L A (flashing) fault code

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

Source

Ideal L A (flashing) fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026