Red lockout indicator bulb High

Chaffoteaux Red lockout indicator bulb Fault Code

Also written as REDLOCKOUTINDICATORBULB — same fault.

The Chaffoteaux Red lockout indicator bulb fault code means: your boiler has failed to light the flame after multiple attempts, so it has automatically shut off its gas supply as a safety precaution.. It appears on 2 Chaffoteaux models 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 a flame is not detected, after 8 seconds, the security solenoid closes and shuts off the gas. The red lockout indicator bulb will light.
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 Red lockout indicator bulb fault code

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

Source

Chaffoteaux Red lockout indicator bulb 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 27 April 2026