BoilerFaultCodesYour boiler's internal computer is trying to communicate with a part or an external controller that it can no longer find or recognize.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Unable to save parameter settings: BUS device is configured but not available at present.
What causes this fault?
This fault occurs when the boiler's main control board loses its digital connection with internal components or external thermostats. It is typically caused by a loose wiring connection, a malfunctioning plug-in radio frequency receiver, or a failing memory chip on the central circuit board. Essentially, the boiler has become 'confused' because it is looking for a device that is no longer responding to its signals.
DIY fix possible
Press the Reset button for five seconds and wait for the boiler to restartCheck that any external thermostats or internet hubs are powered on and connectedCheck for any loose batteries in your wireless room thermostat
Find a Gas Safe engineer
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A boiler cover plan would cover faults like Fault 19 / 202 — no call-out fees, no surprises.
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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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