How much does it cost to fix Ideal error code lockout?

Typical repair cost for the Ideal lockout fault is £150-300 including labour.

lockout High

Ideal lockout Fault Code

Q: What does the Ideal lockout fault code mean?

Your boiler has unsuccessfully tried to start five times and has now shut itself down for safety reasons to prevent a gas buildup.

Also written as LOCKOUT — same fault.

The Ideal lockout fault code means: your boiler has unsuccessfully tried to start five times and has now shut itself down for safety reasons to prevent a gas buildup.. It appears on 2 Ideal models in our database.

Technical description: If, after 5 attempts, the burner has failed to light

Typical repair cost £150-300 (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 lockout fault code

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

Source

Ideal lockout 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