What does the Ferroli ER 9 fault code mean?

Your boiler has detected a communication error with its internal safety thermostat and has shut down to prevent the system from overheating.

How much does it cost to fix Ferroli error code ER 9?

Typical repair cost for the Ferroli ER 9 fault is £150-250 including labour.

FAULT PROTECT SENSOR - Defective temperature limit sensor

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.

Safety-critical — turn off, read this.