3 CH yellow Low

Ferroli 3 CH yellow Fault Code

Also written as 3CHYELLOW — same fault.

The Ferroli 3 CH yellow fault code means: your boiler has received a signal from your thermostat or timer telling it to turn the heating on.. It appears on 1 Ferroli model 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: Central heating room thermostat (72) / clock (62) calling for heat
Typical repair cost £0-120 (including labour)

DIY fix possible

Check if your room thermostat is turned up higher than the current room temperatureEnsure your heating programmer or clock is set to an 'ON' periodReplace the batteries in your wall thermostat if the screen is blank

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Ferroli models that show the 3 CH yellow fault code

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

Source

Ferroli 3 CH yellow 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