Your boiler has detected an internal electrical connection problem that is preventing it from monitoring the system pressure correctly.

Fault in link on 6-way plug J11. Replace (pressure sensor) cable assy. Part No. 5107534

What causes this fault?

This fault occurs when the boiler's main control board loses its physical electrical link with the water pressure sensor. It is typically caused by a loose connection at the plug or a break in the internal wiring harness that monitors the system's safety levels. Because the boiler can no longer verify if there is enough water to operate safely, it will shut down as a precaution.