BoilerFaultCodes Err.L - Err.5 Medium
Boiler Fault Code Err.L - Err.5
Also written as ERRLERR5 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Err.L - Err.5 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 is displaying a list showing the history of recent technical faults rather than a single active problem, suggesting the system has recorded errors while trying to manage its own performance. (As reported on Atag E32S)
Pick your boiler brand for the Err.L - Err.5 fix
Source
Information for the Err.L - Err.5 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