BoilerFaultCodesTechnical description
Control unit is fault manager
What causes this fault?
This fault occurs when the boiler's internal computer chips stop being able to talk to each other reliably across the main circuit board. It is usually caused by a physical degradation of the electronic soldering or a failure in the communication module that acts as the 'translator' for the system's instructions. When these signals are interrupted, the boiler shuts down because it can no longer safely coordinate the fan, pump, and burner.
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.
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