BoilerFaultCodesTechnical description
Internal control unit error
What causes this fault?
This fault occurs when the boiler's main control board suffers a critical electronic failure or a breakdown in communication between internal components. It is often caused by an electrical surge, moisture getting onto the circuitry, or simply the natural degradation of the solder points on the board over time.
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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