What does the Ferroli F35 fault code mean?

Your boiler is struggling because the electricity supply coming from your wall socket isn't stable enough for the machine to operate safely.

How much does it cost to fix Ferroli error code F35?

Typical repair cost for the Ferroli F35 fault is £120-250 including labour.

Check if other electrical appliances in your home are flickering or behaving strangely to rule out a wider power issue

Mains frequency (mains 230V frequency outside limit)

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

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.

Break-even maths on monthly cover.