Boiler Fault Code H02.05

Also written as H0205 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code H02.05 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler’s internal electronic controls are failing to communicate correctly, meaning the system has locked itself out to prevent unsafe operation. (As reported on Remeha Quinta Ace 30)