How much does it cost to fix Chaffoteaux error code 7.ii?

Typical repair cost for the Chaffoteaux 7.ii fault is £120-250 including labour.

7.ii Emergency

Chaffoteaux 7.ii Fault Code

Q: What does the Chaffoteaux 7.ii fault code mean?

Your boiler's internal pressure relief system has been triggered, meaning water is leaking out of a safety pipe outside your home because the pressure inside the system has become too high.

Also written as 7II — same fault.

The Chaffoteaux 7.ii fault code means: your boiler's internal pressure relief system has been triggered, meaning water is leaking out of a safety pipe outside your home because the pressure inside the system has become too high.. It appears on 3 Chaffoteaux models in our database.

Technical description: Safety valve discharges - Not isolated from mains

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 7.ii fault code

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

Source

Chaffoteaux 7.ii 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