Lock out radiator light High

Chaffoteaux Lock out radiator light Fault Code

Also written as LOCKOUTRADIATORLIGHT — same fault.

The Chaffoteaux Lock out radiator light fault code means: your boiler has failed to light the gas flame and has safely shut itself down to prevent any risk.. It appears on 1 Chaffoteaux model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: If the main burner is not established after 5 seconds then the boiter tbils safe to lockout and has to be reset manuaEbyy operating the main ON / OFF switch.
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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Chaffoteaux models that show the Lock out radiator light fault code

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

Source

Chaffoteaux Lock out radiator light fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026