BoilerFaultCodesTechnical description
User interface not compatible with boiler
What causes this fault?
This fault occurs when the main control board and the display screen fail to recognize each other's communication signals. It is usually caused by a software mismatch after a repair or a physical hardware failure where a component's internal memory has become corrupted. Without this digital handshake, the boiler stays off because the two parts cannot agree on how to safely run the system.
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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