How much does it cost to fix boiler error code 164?

Typical repair cost for the boiler 164 fault is £150-300 including labour.

164 High

Boiler Fault Code 164

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code 164 appears across 2 boiler brands and 2 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 an issue with the water pressure or flow sensor in the heating system, which causes it to shut down to prevent damage. (As reported on Navien NCM 1130HH)

Pick your boiler brand for the 164 fix

ECA 164 1 model Navien 164 1 model

Source

Information for the 164 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