How much does it cost to fix Baxi error code Pressure below 0.5?

Typical repair cost for the Baxi Pressure below 0.5 fault is £80-150 including labour.

Pressure below 0.5 High

Baxi Pressure below 0.5 Fault Code

Q: What does the Baxi Pressure below 0.5 fault code mean?

Your boiler has stopped working because the water pressure inside your heating system has dropped too low.

Also written as PRESSUREBELOW05 — same fault.

The Baxi Pressure below 0.5 fault code means: your boiler has stopped working because the water pressure inside your heating system has dropped too low.. It appears on 1 Baxi model in our database.

Technical description: If the pressure falls below 0.5, this may indicate a leak on the central heating system.

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the two silver filling loop taps located underneath the boiler.Open the taps slowly to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close both taps tightly to stop the flow of water.

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Baxi models that show the Pressure below 0.5 fault code

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

Combi 80e Repair: £80-150

Source

Baxi Pressure below 0.5 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