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

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

Pressure below 1 High

Baxi Pressure below 1 Fault Code

Q: What does the Baxi Pressure below 1 fault code mean?

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.

Also written as PRESSUREBELOW1 — same fault.

The Baxi Pressure below 1 fault code means: 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.. It appears on 1 Baxi model in our database.

Technical description: May indicate a leak on the central heating system.

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the external filling loop, which is a silver braided hose connecting your central heating pipes.Open the valves at both ends of the filling loop to allow cold mains water into the system.Watch the pressure gauge on the boiler front until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close both valves firmly and check that the pressure remains steady.

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Baxi models that show the Pressure below 1 fault code

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

Solo 3 PFL Repair: £80-150

Source

Baxi Pressure below 1 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