Your boiler has encountered a minor glitch and is attempting to restart itself automatically without you needing to do anything.

What causes this fault?

This fault occurs when the boiler's internal computer detects a minor communication glitch or a temporary electrical blip that doesn't match its normal operating sequence. It is often triggered by a momentary fluctuation in the power supply or a brief internal sensor disagreement. Because the system can't quite identify the specific issue, it pauses briefly to verify its safety checks before clearing the error itself.