Red lockout indicator bulb 29 High

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.

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 29(fig. 5) will show.
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 29 fault code

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

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