BoilerFaultCodesTechnical description
Communication error
What causes this fault?
This fault occurs when the boiler's main control board loses its digital connection with another internal component, such as the display screen or a sensor module. The most common reason is a loose or damaged wiring connection between these parts, or a physical failure inside the main electronic circuit board itself.
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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