Chaffoteaux Red lockout indicator bulb 29 Fault Code
Also written as REDLOCKOUTINDICATORBULB29 — same fault.
The Chaffoteaux Red lockout indicator bulb 29 fault code means: your boiler has failed to light the flame three times, so it has purposefully shut itself off for your safety.. 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 29(fig. 5) will show.
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 29 fault code
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Source
Chaffoteaux Red lockout indicator bulb 29 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