BoilerFaultCodes 0 bar High
Boiler Fault Code 0 bar
Also written as 0BAR — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 0 bar appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost its water pressure, which means it has stopped running to protect the internal components from damage. (As reported on Glow-worm Xtrafast 96 120)
Pick your boiler brand for the 0 bar fix
Source
Information for the 0 bar 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