How much does it cost to fix Chaffoteaux error code 30 40 50?

Typical repair cost for the Chaffoteaux 30 40 50 fault is £120-250 including labour.

30 40 50 High

Chaffoteaux 30 40 50 Fault Code

Q: What does the Chaffoteaux 30 40 50 fault code mean?

Your boiler has detected that hot water isn't moving through your heating system properly, so it has shut down to prevent itself from overheating.

Also written as 304050 — same fault.

The Chaffoteaux 30 40 50 fault code means: your boiler has detected that hot water isn't moving through your heating system properly, so it has shut down to prevent itself from overheating.. It appears on 2 Chaffoteaux models in our database.

Technical description: Lack of water circulation.

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 30 40 50 fault code

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

Source

Chaffoteaux 30 40 50 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