How much does it cost to fix Ideal error code Lockout light on?

Typical repair cost for the Ideal Lockout light on fault is £90-250 including labour.

Lockout light on High

Ideal Lockout light on Fault Code

Q: What does the Ideal Lockout light on fault code mean?

Your boiler has stopped itself for safety because it failed to light or stay running, and it needs to be manually reset.

Also written as LOCKOUTLIGHTON — same fault.

The Ideal Lockout light on fault code means: your boiler has stopped itself for safety because it failed to light or stay running, and it needs to be manually reset.. It appears on 1 Ideal model in our database.

Technical description: Ignition failure or safety interruption requiring manual reset of the lockout switch.

What causes the Ideal Lockout light on fault?

This fault happens when the boiler tries to start but fails to detect a constant, safe flame. It is usually caused by a worn-out ignition spark, a blocked pilot light, or a gas valve that is no longer opening correctly to let fuel into the burner.

Typical repair cost £90-250 (including labour)

DIY fix possible

Locate the lockout reset button on the control panelPress the button or wait 10 seconds and turn the control knob to 'Off' then back to 'On'Check that your gas supply is active and credit is on the meter

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Ideal models that show the Lockout light on fault code

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

Concord Super Series 4 Repair: £90-250

Source

Ideal Lockout light on 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