How much does it cost to fix Chaffoteaux error code 30 40 50 70 80?

Typical repair cost for the Chaffoteaux 30 40 50 70 80 fault is £150-300 including labour.

30 40 50 70 80 Emergency

Chaffoteaux 30 40 50 70 80 Fault Code

Q: What does the Chaffoteaux 30 40 50 70 80 fault code mean?

Your boiler has detected a flame signal when it shouldn't be running, which indicates a potential internal problem with the gas safety detection system.

Also written as 3040507080 — same fault.

The Chaffoteaux 30 40 50 70 80 fault code means: your boiler has detected a flame signal when it shouldn't be running, which indicates a potential internal problem with the gas safety detection system.. It appears on 2 Chaffoteaux models in our database.

Technical description: Fire detection without burner working

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 30 40 50 70 80 fault code

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

Source

Chaffoteaux 30 40 50 70 80 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