How much does it cost to fix Baxi error code E.02 .39?

Typical repair cost for the Baxi E.02 .39 fault is £80-150 including labour.

E.02 .39 High

Baxi E.02 .39 Fault Code

Q: What does the Baxi E.02 .39 fault code mean?

Your boiler has detected that the water pressure inside the system is too low and has failed to top itself up automatically after several minutes of trying.

Also written as E0239 — same fault.

The Baxi E.02 .39 fault code means: your boiler has detected that the water pressure inside the system is too low and has failed to top itself up automatically after several minutes of trying.. It appears on 3 Baxi models in our database.

Technical description: Minimum pressure not reached after 6 minutes of automatic filling

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the filling loop or external filling valve underneath your boiler.Slowly open the valve to allow mains water to enter the system until the pressure gauge on the front reads between 1.0 and 1.5 bar.Close the valve tightly and restart the boiler.

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Baxi models that show the E.02 .39 fault code

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

Source

Baxi E.02 .39 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 7 July 2026