29 High

Chaffoteaux 29 Fault Code

The Chaffoteaux 29 fault code means: your boiler is stuck in heating mode, which means your radiators might stay hot even when you only want hot water, or you may find you have no hot water at all.. It appears on 5 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: Three way valve blocked in CH mode
Typical repair cost £180-320 (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 29 fault code

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

Source

Chaffoteaux 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 7 July 2026