BoilerFaultCodesBaxi 25 Fault Code
The Baxi 25 fault code means: your boiler is struggling to move water around your heating system because there is either not enough pressure inside the pipes or the internal pump has stopped working.. It appears on 9 Baxi models in our database.
Technical description: Fault on Pump or Low System Pressure
DIY fix possible
Check the pressure gauge on the front panel; if it is below 1 bar, locate the filling loop under the boiler.Slowly open the valves on the filling loop until the gauge needle rises to between 1 and 1.5 bar.Close the filling loop valves tightly and reset the boiler by turning the selector switch to the reset position.
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Baxi models that show the 25 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi 25 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