BoilerFaultCodesYour boiler system has lost communication with the secondary control boards that help manage the heating demand.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: SLAVES NON PRESENT There are no slave boards connected
What causes this fault?
This fault occurs when the boiler's main brain loses its connection to the internal sub-boards that coordinate the heating demand. The most common reason is a loose or damaged communication wire between these components, or a electronic failure within one of the secondary control boards themselves.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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