How much does it cost to fix boiler error code 3 CH yellow?

Typical repair cost for the boiler 3 CH yellow fault is £0-120 including labour.

3 CH yellow Low

Boiler Fault Code 3 CH yellow

Also written as 3CHYELLOW — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 3 CH yellow appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has received a signal from your thermostat or timer telling it to turn the heating on. (As reported on Ferroli Combi 77 FF Popular)

Pick your boiler brand for the 3 CH yellow fix

Ferroli 3 CH yellow 1 model

Source

Information for the 3 CH yellow fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026