LED 2 yellow (1) [CH mode] Low

Ferroli LED 2 yellow (1) [CH mode] Fault Code

Also written as LED2YELLOW1CHMODE — same fault.

The Ferroli LED 2 yellow (1) [CH mode] fault code means: your boiler has correctly sensed that a hot water tap is running, and this light simply signifies that it is currently preparing to heat your water.. It appears on 2 Ferroli models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Hot water tap open - D.H.W. flow switch (38) contact closed

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 (1) [CH mode] fault code

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

Source

Ferroli LED 2 yellow (1) [CH 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