204 High

Chaffoteaux 204 Fault Code

The Chaffoteaux 204 fault code means: your boiler has detected an issue with the sensors that monitor the internal water flow or temperature, meaning it has shut down to protect itself from potential overheating.. It appears on 1 Chaffoteaux model 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: Heating body assembly
Typical repair cost £150-300 (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 204 fault code

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

Source

Chaffoteaux 204 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