BoilerFaultCodesFerroli LED 6 (DHW) Fault Code
Also written as LED6DHW — same fault.
The Ferroli LED 6 (DHW) fault code means: your boiler has stopped working because it has detected an issue with its water pressure or internal sensors, preventing it from safely heating your home or water.. It appears on 2 Ferroli models in our database.
Technical description: Short circuit on D.H.W. sensor (42) or resistance lower than 500 Ohm; C.H. limit thermostat (50) open circuit (pump run); C.H. water pressure low (114 open circuit).
DIY fix possible
Check the boiler pressure gauge on the front panel; if it is below 1.0 bar, use the filling loop to top it up to between 1.0 and 1.5 barTurn the boiler off at the mains for 60 seconds to reset the electronic faultTurn the boiler back on and observe if the error clears
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Ferroli models that show the LED 6 (DHW) fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ferroli LED 6 (DHW) fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026