How much does it cost to fix boiler error code Main circuit pressure - red?

Typical repair cost for the boiler Main circuit pressure - red fault is £100-250 including labour.

Main circuit pressure - red Emergency

Boiler Fault Code Main circuit pressure - red

Also written as MAINCIRCUITPRESSURERED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Main circuit pressure - red 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 inside it, causing the pressure to rise to an unsafe level. (As reported on Biasi Gaia)

Pick your boiler brand for the Main circuit pressure - red fix

Biasi Main circuit pressure - red 1 model

Source

Information for the Main circuit pressure - red 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