BoilerFaultCodes 5.2.19 Error 782 High
Boiler Fault Code 5.2.19 Error 782
Also written as 5219ERROR782 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 5.2.19 Error 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 internal controller has lost its connection, meaning it cannot receive signals from the display panel to operate your heating and hot water. (As reported on Navien NCB 28 HE)
Pick your boiler brand for the 5.2.19 Error 782 fix
Source
Information for the 5.2.19 Error 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