BoilerFaultCodesBiasi E54 Fault Code
The Biasi E54 fault code means: your boiler has tried to top itself up with water automatically but the pressure is still too low for it to start running.. It appears on 2 Biasi models in our database.
Technical description: Filling function of C.H. water completed, but pressure is lower than the minimum pressure for boiler filling.
DIY fix possible
Locate the filling loop (the flexible silver hose) underneath the boilerOpen the filling valve(s) slowly until you hear water enteringWatch the pressure gauge and close the valves when it reaches 1.5 barPress the Reset button on the boiler control panel
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Gas Safe Register →Biasi models that show the E54 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi E54 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026