LED 3 OFF (DHW Mode) High

Ferroli LED 3 OFF (DHW Mode) Fault Code

Also written as LED3OFFDHWMODE — same fault.

The Ferroli LED 3 OFF (DHW Mode) fault code means: your boiler has lost the ability to measure the temperature of the water used for your taps and shower, so it cannot produce hot water.. It appears on 1 Ferroli model 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: D.H.W. Sensor fault
Typical repair cost £120-200 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ferroli models that show the LED 3 OFF (DHW Mode) fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ferroli LED 3 OFF (DHW Mode) 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