BoilerFaultCodesYour boiler's electronic control board has detected an internal computer error and has shut down as a safety precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal fault
What causes this fault?
These codes indicate that the boiler's central control board has suffered a critical software or hardware glitch, preventing it from managing the heating process safely. This usually happens because internal components on the circuit board have worn out or been damaged by a power surge, meaning the 'brain' of the boiler can no longer communicate with the sensors and valves. Because the board can no longer guarantee safe operation, it enters a protective shutdown mode.
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 55 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Vokera Linea HE 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.