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

Typical repair cost for the Chaffoteaux 30 50 70 fault is £150-250 including labour.

30 50 70 High

Chaffoteaux 30 50 70 Fault Code

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

Your boiler is struggling to clear exhaust fumes correctly because it is not detecting the necessary air pressure change to safely start the heating process.

Also written as 305070 — same fault.

The Chaffoteaux 30 50 70 fault code means: your boiler is struggling to clear exhaust fumes correctly because it is not detecting the necessary air pressure change to safely start the heating process.. It appears on 2 Chaffoteaux models in our database.

Technical description: Extractor on and pressure regulator at rest

Typical repair cost £150-250 (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 50 70 fault code

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

Source

Chaffoteaux 30 50 70 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