Your boiler has detected a minor internal communication error and and is currently attempting to automatically reset itself.

Temporary fault code (Refer to section 7.10)

What causes this fault?

This fault occurs when the boiler's internal computer experiences a brief moment of confusion or data interference while talking to its own sensors. It is essentially a software 'hiccup' where the main control board loses its place for a split second and needs to recalibrate. In most cases, it is a one-off event caused by a minor electrical fluctuation or a temporary communication delay within the system.