BoilerFaultCodes HJ-08 Medium
Boiler Fault Code HJ-08
Also written as HJ08 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code HJ-08 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 has too much water pressure and needs some drained out to reach a safe operating level. (As reported on Daikin D2CND)
Pick your boiler brand for the HJ-08 fix
Source
Information for the HJ-08 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