BoilerFaultCodes E.782 High
Boiler Fault Code E.782
Also written as E782 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E.782 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 main control unit and the display panel are having trouble 'talking' to each other, which prevents the system from operating correctly. (As reported on Navien NCB 28 HE)
Pick your boiler brand for the E.782 fix
Source
Information for the E.782 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