BoilerFaultCodesYour boiler has lost its fine-tuning and needs to undergo a self-calibration process to ensure the gas and air are burning efficiently.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Calibration required
What causes this fault?
This fault occurs when the boiler's internal computer loses track of the precise balance between gas and air needed for a clean flame. It often happens after a power cut, a sudden change in gas pressure, or if the internal components have worn slightly over time, causing the system to lose its 'fine-tuning'.
DIY fix possible
Press and hold the 'R' (Reset) button for at least 2 seconds.Wait for the boiler to complete its automatic calibration sequence, which may take several minutes.Ensure all radiator valves are open to allow the boiler to disperse heat during the process.
Find a Gas Safe engineer
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