How much does it cost to fix boiler error code X00?

Typical repair cost for the boiler X00 fault is £90-150 including labour.

X00 Low

Boiler Fault Code X00

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code X00 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 is currently set to a special configuration mode used by engineers for testing or setup, rather than operating in normal heating mode. (As reported on Remeha Quinta 85)

Pick your boiler brand for the X00 fix

Remeha X00 3 models

Source

Information for the X00 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