Combustion lockout Emergency

Ideal Combustion lockout Fault Code

Also written as COMBUSTIONLOCKOUT — same fault.

The Ideal Combustion lockout fault code means: your boiler has failed to light the flame after several attempts and has shut itself down for safety.. It appears on 1 Ideal model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Indication of combustion lockout / nonvolatile lockout if detection does not take place after 5 attempts at ignition.
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 Combustion lockout fault code

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

Source

Ideal Combustion 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 7 July 2026