BoilerFaultCodesTechnical description
Internal error.
What causes this fault?
This fault occurs when the boiler's internal computer suffers a communication failure or data error between its electronic components. The most common reason is a temporary electrical surge or a physical degradation of the circuits on the main control board, which prevents the boiler from safely managing the ignition and heating process.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register →