BoilerFaultCodesBaxi L8 Fault Code
The Baxi L8 fault code means: your boiler has detected that it is running without enough water inside, which prevents it from firing up to provide your heating or hot water.. It appears on 1 Baxi model in our database.
Technical description: Dry Fire Fault
DIY fix possible
Locate the external filling loop, usually a silver braided hose under the boiler.Open the valves on the filling loop to allow cold mains water into the boiler.Monitor the pressure gauge on the front panel until the needle reaches the green zone, typically between 1.0 and 1.5 bar.Close both valves tightly and restart the boiler.
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Baxi models that show the L8 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi L8 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