BoilerFaultCodesYour boiler's main control board is currently unable to communicate with its internal memory chip and needs a software or hardware synchronisation.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Printed circuit board (PCB) requires a boiler chip card (BCC) update
What causes this fault?
This fault occurs when the boiler's main control board loses its connection to the memory chip that holds the unit's specific configuration settings. It is often caused by a temporary data glitch, a loose connection on the circuit board, or the memory chip itself becoming faulty and unable to send instructions to the boiler.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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 UA-65 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
Affiliate links — we may earn a commission at no extra cost to you.