Pressure Gauge (below 0.5 bar) High

Baxi Pressure Gauge (below 0.5 bar) Fault Code

Also written as PRESSUREGAUGEBELOW05BAR — same fault.

The Baxi Pressure Gauge (below 0.5 bar) fault code means: your boiler has stopped working because the water pressure is too low, often caused by a small leak or recently bled radiators.. It appears on 5 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The boiler will not function. May indicate a leak on the central heating system.
Typical repair cost £0-120 (including labour)

DIY fix possible

Locate the external filling loop, which is usually a flexible silver hose with two small taps.Slowly open both taps to allow water into the system while watching the pressure gauge.Close both taps tightly once the needle reaches between 1.0 and 1.5 bar.

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Baxi models that show the Pressure Gauge (below 0.5 bar) fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi Pressure Gauge (below 0.5 bar) fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

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