Technical description
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What causes this fault?
These codes appear when the boiler's internal computer is running through its initial boot-up sequence or performing a temporary software update. They are typically seen after the power has been switched off and back on, or following a brief interruption in the electrical supply. It is the system's way of checking all safety sensors and settings before it begins the ignition process.
This code may be seen more frequently during winter months if local power outages or grid fluctuations occur due to heavy storms.
DIY fix possible
Wait up to 15 minutes for the sequence to completeDo not turn the power off during the updateIf the code persists for over an hour, try a single reset