How much does it cost to fix boiler error code 001?

Typical repair cost for the boiler 001 fault is £120-250 including labour.

001 Medium

Boiler Fault Code 001

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 001 appears across 2 boiler brands and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that the internal pump is running while the burner is inactive, which can sometimes happen due to a temporary system glitch. (As reported on Navien NCB)

Pick your boiler brand for the 001 fix

Ideal 001 1 model Navien 001 7 models

Source

Information for the 001 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