LED 2 yellow (0) [DHW mode] High

Ferroli LED 2 yellow (0) [DHW mode] Fault Code

Also written as LED2YELLOW0DHWMODE — same fault.

The Ferroli LED 2 yellow (0) [DHW mode] fault code means: your boiler does not realise that you have turned on your hot water tap, so it is failing to heat the water for your shower or kitchen faucet.. 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: D.H.W. flow switch (38) not operating.
Typical repair cost £120-220 (including labour)

Engineer required

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

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Ferroli models that show the LED 2 yellow (0) [DHW mode] fault code

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

Source

Ferroli LED 2 yellow (0) [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