BoilerFaultCodes E782 High
Boiler Fault Code E782
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E782 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's internal electronic control boards are failing to talk to each other, which means the system cannot safely manage your heating or hot water. (As reported on Navien NCB CE)
Pick your boiler brand for the E782 fix
Source
Information for the E782 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 7 July 2026