How much does it cost to fix boiler error code System pressure below 0.4 bar?

Typical repair cost for the boiler System pressure below 0.4 bar fault is £0-120 including labour.

System pressure below 0.4 bar High

Boiler Fault Code System pressure below 0.4 bar

Also written as SYSTEMPRESSUREBELOW04BAR — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code System pressure below 0.4 bar 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 stopped working because the water pressure in the system has dropped too low. (As reported on Ideal Europa)

Pick your boiler brand for the System pressure below 0.4 bar fix

Ideal System pressure below 0.4 bar 1 model

Source

Information for the System pressure below 0.4 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