BoilerFaultCodesYour boiler's internal computer has developed a fault and is unable to communicate correctly with the rest of the system.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Control board fault
What causes this fault?
This fault occurs when the boiler's central control board suffers an internal hardware failure or a memory corruption. It is usually caused by electrical wear and tear over time or a sudden power surge that damages the delicate circuits responsible for managing the boiler's functions.
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 05 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Vokera Linea Max is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.