Your boiler has detected a temporary internal communication error or a logic conflict and is likely attempting a self-correction or restart.

Temporary fault code (Refer to section 7.10)

What causes this fault?

This fault occurs when the boiler's internal computer experiences a brief digital glitch or a conflict in the data it is processing. It is often caused by a minor synchronization error between the sensors and the main control board, which usually prompts the system to pause and recalibrate itself. In most cases, it is a transient software hiccup rather than a hardware failure.