BoilerFaultCodes ER + 69 High
Boiler Fault Code ER + 69
Also written as ER69 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code ER + 69 appears across 1 boiler brand and 11 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 an internal communication failure between the electronic control boards, meaning it cannot process commands to provide heating or hot water. (As reported on Biasi M90E 24S)
Pick your boiler brand for the ER + 69 fix
Source
Information for the ER + 69 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