BoilerFaultCodes E03-885 High
Boiler Fault Code E03-885
Also written as E03885 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E03-885 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 experiencing a communication fault within its internal wiring, meaning it cannot properly send or receive the signals needed to operate safely. (As reported on Keston S30)
Pick your boiler brand for the E03-885 fix
Source
Information for the E03-885 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