BoilerFaultCodesYour boiler's internal computer has lost communication with its control components, meaning it cannot receive or send the signals needed to operate.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: BUS communication fault: Boiler no longer reporting.
What causes this fault?
This fault occurs when the boiler's main brain and its internal components stop talking to each other, often due to an electrical interruption or a fried component. The most common reason is that the main control board has suffered a critical failure, though it can also be caused by loose or damaged wiring inside the unit.
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 Fault 01 / 200 — 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.