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

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

5.v High

Boiler Fault Code 5.v

Also written as 5V — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 5.v appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning 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. (As reported on Chaffoteaux Sterling FF)

Pick your boiler brand for the 5.v fix

Chaffoteaux 5.v 3 models

Source

Information for the 5.v fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026