How much does it cost to fix Baxi error code 26?

Typical repair cost for the Baxi 26 fault is £150-350 including labour.

26 High

Baxi 26 Fault Code

Q: What does the Baxi 26 fault code mean?

Your boiler is struggling to circulate water, likely because there is not enough pressure in the system or the internal pump has stopped working.

The Baxi 26 fault code means: your boiler is struggling to circulate water, likely because there is not enough pressure in the system or the internal pump has stopped working.. It appears on 6 Baxi models in our database.

Technical description: Fault on Pump or Low System Pressure

Typical repair cost £150-350 (including labour)

DIY fix possible

Check your boiler's pressure gauge on the front panel; if it is below 1 bar, you may need to top it up using the external filling loop.Ensure your system pressure is set to roughly 1.5 bar.If the pressure is correct, ensure your heating controls and room thermostat are set to 'on' to see if the pump triggers.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Baxi models that show the 26 fault code

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

Source

Baxi 26 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