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

Typical repair cost for the Chaffoteaux 5.v fault is £150-250 including labour.

5.v High

Chaffoteaux 5.v Fault Code

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

Your boiler's hot water system is failing to regulate its temperature correctly, meaning the unit is unable to provide a consistent hot water supply.

Also written as 5V — same fault.

The Chaffoteaux 5.v fault code means: your boiler's hot water system is failing to regulate its temperature correctly, meaning the unit is unable to provide a consistent hot water supply.. It appears on 3 Chaffoteaux models in our database.

Technical description: Hot water does not operate over temperature range - Hot water limit stat out of calibration

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 5.v fault code

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

Source

Chaffoteaux 5.v 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