How much does it cost to fix boiler error code 0.5bar?

Typical repair cost for the boiler 0.5bar fault is £0-120 including labour.

0.5bar High

Boiler Fault Code 0.5bar

Also written as 05BAR — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 0.5bar appears across 2 boiler brands and 7 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 water pressure and has shut down to prevent damage, meaning you currently have no heating or hot water. (As reported on Glow-worm 30ci Plus)

Pick your boiler brand for the 0.5bar fix

Glow-worm 0.5bar 3 models Saunier Duval 0.5bar 4 models

Source

Information for the 0.5bar 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