BoilerFaultCodesBaxi 26 Fault Code
The Baxi 26 fault code means: your boiler has detected that water is either not moving through the system properly or there is not enough pressure for it to operate safely.. It appears on 8 Baxi models in our database.
Technical description: Fault on Pump or Low System Pressure
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop underneath the boiler to carefully top it up.Ensure all radiator valves are open and that the pump has not become stuck after a long period of inactivity.
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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 7 July 2026