BoilerFaultCodes 782 High
Boiler Fault Code 782
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 782 appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected a communication error between its main computer and the internal circuit board, which effectively shuts down the system to prevent incorrect operation. (As reported on Navien NCB)
Pick your boiler brand for the 782 fix
Source
Information for the 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