How much does it cost to fix boiler error code E127?

Typical repair cost for the boiler E127 fault is £150-250 including labour.

E127 High

Boiler Fault Code E127

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E127 appears across 2 boiler brands and 9 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's air pressure sensor is failing to communicate properly, which means the safety system is preventing the burner from lighting to ensure the unit operates safely. (As reported on Navien NCB 28 HE)

Pick your boiler brand for the E127 fix

Main E127 1 model Navien E127 8 models

Source

Information for the E127 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