What does the Ferroli 4 (Permanent) fault code mean?

Your boiler thinks the central heating should be running constantly, which can lead to overheating or your radiators staying on when they shouldn't.

How much does it cost to fix Ferroli error code 4 (Permanent)?

Typical repair cost for the Ferroli 4 (Permanent) fault is £120-280 including labour.

Central heating circuit ON

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Lockout fault with a reset-needed pattern.

Sludge build-up — needs flushing, not bleeding.

Safety-critical — turn off, read this.