How much does it cost to fix boiler error code C17?

Typical repair cost for the boiler C17 fault is £150-250 including labour.

C17 High

Boiler Fault Code C17

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code C17 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to accurately measure the temperature of the water returning to it, which causes it to stop operating to prevent potential damage. (As reported on Atag Premier)

Pick your boiler brand for the C17 fix

Atag C17 1 model

Source

Information for the C17 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