BoilerFaultCodes Error 80 Emergency
Boiler Fault Code Error 80
Also written as ERROR80 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Error 80 appears across 1 boiler brand and 5 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 that the gases venting out of your flue are getting dangerously hot and has shut itself down to prevent damage or overheating. (As reported on Atag Q 30CR)
Pick your boiler brand for the Error 80 fix
Source
Information for the Error 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