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.

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.

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

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Work through these before the call-out.

Lockout fault with a reset-needed pattern.

7 signs repair isn't worth it anymore.