How much does it cost to fix Ferroli error code LED 4: 0 (Central Heating)?

Typical repair cost for the Ferroli LED 4: 0 (Central Heating) fault is £90-180 including labour.

LED 4: 0 (Central Heating) High

Ferroli LED 4: 0 (Central Heating) Fault Code

Q: What does the Ferroli LED 4: 0 (Central Heating) fault code mean?

Your boiler has stopped working because it thinks it is overheating or it cannot correctly read the temperature sensor for your radiators.

Also written as LED40CENTRALHEATING — same fault.

The Ferroli LED 4: 0 (Central Heating) fault code means: your boiler has stopped working because it thinks it is overheating or it cannot correctly read the temperature sensor for your radiators.. 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 (61) below CH temperature

Typical repair cost £90-180 (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: 0 (Central Heating) fault code

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

Source

Ferroli LED 4: 0 (Central Heating) 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