LED 6 (B) High

Ferroli LED 6 (B) Fault Code

Also written as LED6B — same fault.

The Ferroli LED 6 (B) fault code means: your boiler has stopped working because it has detected an issue with its internal temperature sensors or water pressure levels, preventing it from safely heating your home.. It appears on 1 Ferroli model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: C.H. sensor (34) short circuit or resistance lower than 500 ohm; C.H. limit thermostat (50) open circuit (pump will run); C.H. water pressure low (114 open circuit)
Typical repair cost £120-250 (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 6 (B) fault code

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

Source

Ferroli LED 6 (B) 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