BoilerFaultCodesYour boiler's main internal computer has developed a communication fault or an electronic failure, preventing the system from operating safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal control unit error
What causes this fault?
This fault occurs when the boiler's main control board experiences an internal electronic failure or loses the ability to communicate with other sensors. The most common reason is age-related component fatigue on the circuit board, though it can also be triggered by a loose connection in the internal wiring harness. Because the 'brain' of the boiler can no longer guarantee safe operation, it shuts the system down as a precaution.
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 E14 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Remeha Avanta Plus 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.