BoilerFaultCodesYour boiler's computer system has detected an internal electronic fault, preventing the heating and hot water from starting up.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: The burner control unit has an error
What causes this fault?
This fault occurs when the boiler's internal computer can no longer communicate correctly with the parts that manage the flame. The most common reason is an electronic failure within the control board or a loose connection in the internal wiring. This prevents the boiler from safely starting the ignition process, so it shuts down to protect the system.
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 EC256 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch GB162 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.