407 High

Boiler Fault Code 407

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 407 appears across 3 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal computer has suffered a technical failure and is unable to control the heating or hot water operations. (As reported on Ideal Response SE)

Pick your boiler brand for the 407 fix

Ariston 407 2 models Ideal 407 2 models Navien 407 7 models

Source

Information for the 407 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