2 yellow Medium

Ferroli 2 yellow Fault Code

Also written as 2YELLOW — same fault.

The Ferroli 2 yellow fault code means: your boiler thinks you are running a hot tap even when they are all turned off, which may cause the heating to stay off or the internal water to overheat.. It appears on 1 Ferroli model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Domestic hot water flow switch (38) on
Typical repair cost £90-160 (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 2 yellow fault code

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

Source

Ferroli 2 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