How much does it cost to fix boiler error code CONDITION 3?

Typical repair cost for the boiler CONDITION 3 fault is £150-450 including labour.

CONDITION 3 High

Boiler Fault Code CONDITION 3

Also written as CONDITION3 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code CONDITION 3 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 trying to start up but the burner refuses to ignite, meaning it cannot produce any heat for your home or water. (As reported on Keston R-sm 20 FB)

Pick your boiler brand for the CONDITION 3 fix

Keston CONDITION 3 1 model

Source

Information for the CONDITION 3 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