BoilerFaultCodesFerroli 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.
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.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like LED 2 yellow (1) [CH mode]: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
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 7 July 2026