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.
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.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →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