Your boiler has detected a temporary internal communication error and is attempting to restart itself.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Temporary fault code (Refer to section 7.10)
What causes this fault?
This fault occurs when the boiler's internal computer system experiences a temporary glitch in communication between its electronic components. It is most commonly caused by a minor electrical interference or a momentary loss of data signal, which prompts the boiler to automatically reset to ensure everything is working correctly.
DIY fix possible
Wait for the boiler to complete its automatic reset cycleTurn the mode selector switch to the 'OFF/RESET' position for 10 secondsReturn the switch to the original heating or hot water position
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