LED 6 (DHW) High

Ferroli 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.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

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).
Typical repair cost £120-250 (including labour)

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 27 April 2026