How much does it cost to fix boiler error code 158?

Typical repair cost for the boiler 158 fault is £80-150 including labour.

158 High

Boiler Fault Code 158

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code 158 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 has temporarily stopped working because the pipe that drains away waste water is blocked or frozen, causing a safety switch to activate. (As reported on Navien NCM 1130HH)

Pick your boiler brand for the 158 fix

Navien 158 1 model

Source

Information for the 158 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 31 August 2026