BoilerFaultCodesTechnical description
System fault boiler electronics / basic controller
What causes this fault?
This fault occurs when the boiler's main control board loses its ability to communicate with other internal electronic components. It is typically caused by a data error within the software or a physical failure of the circuitry that manages the boiler's core operations. Think of it as a computer crash where the hardware can no longer process the instructions needed to keep the system running safely.
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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