How much does it cost to fix boiler error code E351?

Typical repair cost for the boiler E351 fault is £150-250 including labour.

E351 High

Boiler Fault Code E351

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E351 appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to monitor the water pressure in your heating system, so it has safely shut down to prevent potential damage. (As reported on Navien NCB)

Pick your boiler brand for the E351 fix

Navien E351 6 models

Source

Information for the E351 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