BoilerFaultCodes 50 80 High
Boiler Fault Code 50 80
Also written as 5080 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 50 80 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to detect the temperature of your hot water supply because a connection or sensor inside has likely stopped working. (As reported on Chaffoteaux Serelia 24 MFFI)
Pick your boiler brand for the 50 80 fix
Source
Information for the 50 80 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