Boiler Fault Code Pressure Gauge below 1

Also written as PRESSUREGAUGEBELOW1 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Pressure Gauge below 1 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 lost the water pressure it needs to circulate heat, which means it will stop working until the system is topped up. (As reported on Baxi Bahama 100)