How much does it cost to fix boiler error code Pressure below 1?

Typical repair cost for the boiler Pressure below 1 fault is £80-150 including labour.

Pressure below 1 High

Boiler Fault Code Pressure below 1

Also written as PRESSUREBELOW1 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Pressure below 1 appears across 2 boiler brands and 2 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 the water pressure required to circulate heat around your home, likely due to a small leak somewhere in your radiator system. (As reported on Baxi Solo 3 PFL)

Pick your boiler brand for the Pressure below 1 fix

Baxi Pressure below 1 1 model Potterton Pressure below 1 1 model

Source

Information for the Pressure below 1 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