Your boiler has detected a problem with the sensor that monitors internal water pressure, meaning it cannot confirm if there is enough water to operate safely.

Water pressure sensor error, could be open or short

What causes this fault?

This fault occurs when the boiler's control board loses communication with the sensor that monitors water levels inside the system. It is usually caused by a physical failure of the sensor's internal components, loose or corroded electrical connections, or a malfunction in the main control board itself.