How much does it cost to fix Chaffoteaux error code 5.vii?

Typical repair cost for the Chaffoteaux 5.vii fault is £120-280 including labour.

5.vii High

Chaffoteaux 5.vii Fault Code

Q: What does the Chaffoteaux 5.vii fault code mean?

Your boiler is struggling to provide consistent hot water because a safety sensor is failing to stay in the correct position while the water is running.

Also written as 5VII — same fault.

The Chaffoteaux 5.vii fault code means: your boiler is struggling to provide consistent hot water because a safety sensor is failing to stay in the correct position while the water is running.. It appears on 3 Chaffoteaux models in our database.

Technical description: Hot water does not operate over temperature range - Pressure switch hunting

Typical repair cost £120-280 (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 5.vii fault code

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

Source

Chaffoteaux 5.vii 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