How much does it cost to fix boiler error code Condition K?

Typical repair cost for the boiler Condition K fault is £280-450 including labour.

Condition K High

Boiler Fault Code Condition K

Also written as CONDITIONK — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Condition K 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's internal computer brain is failing to communicate correctly, often due to moisture or a significant electronic fault. (As reported on Worcester Bosch 24CDi BF)

Pick your boiler brand for the Condition K fix

Worcester Bosch Condition K 1 model

Source

Information for the Condition K 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