How much does it cost to fix Ferroli error code LED 4 green (0) [CH mode]?

Typical repair cost for the Ferroli LED 4 green (0) [CH mode] fault is £120-220 including labour.

LED 4 green (0) [CH mode] High

Ferroli LED 4 green (0) [CH mode] Fault Code

Q: What does the Ferroli LED 4 green (0) [CH mode] fault code mean?

Your boiler has stopped producing heat because it is struggling to accurately read its own internal temperature or has overheated.

Also written as LED4GREEN0CHMODE — same fault.

The Ferroli LED 4 green (0) [CH mode] fault code means: your boiler has stopped producing heat because it is struggling to accurately read its own internal temperature or has overheated.. It appears on 2 Ferroli models in our database.

Technical description: Central heating sensor (34) not connected or boiler temperature too high or boiler thermostat (63) below CH temperature

Typical repair cost £120-220 (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 LED 4 green (0) [CH mode] fault code

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

Source

Ferroli LED 4 green (0) [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