BoilerFaultCodesYour heating system is currently trying to establish a link between the heat pump and its control unit.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Information screen displayed when initializing communication between the Heat Pump and Smart Interface
What causes this fault?
This code appears when the main heat pump unit is trying to find and sync with the smart control interface inside your home. It usually happens during the initial setup or immediately after a power cut as the components reboot and exchange data. In most cases, it is simply a startup sequence rather than a hardware failure.
DIY fix possible
Wait up to 10 minutes for the setup to finish automaticallyEnsure the Smart Interface is powered onIf it persists beyond 15 minutes, press the reset button on the interface
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like CF05 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.