Glow-worm · Ultracom2 sxi
F10 boiler fault code
Ultracom2 12sxi/18sxi/30sxi
What F10 means
Flow heating temperature sensor fault
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, or someone has possible carbon-monoxide symptoms, leave and call 0800 111 999 from outside.
Safe check: Note the displayed code. Do not open, adjust or repeatedly reset the boiler. Contact a Gas Safe registered engineer.
Gas Safe registered engineer: Contact a Gas Safe registered engineer for diagnosis of this fault.
Official source: Glow-worm Trade · Fault finding codes for the Ultracom₂ sxi range, F10