Your boiler has paused operation due to a temporary internal communication or sensor error that may clear itself or indicate a service is needed.

Temporary fault code (Refer to section 7.10)

What causes this fault?

This fault occurs when the boiler's internal computer receives an inconsistent or 'out of range' signal from one of its heat sensors. The most common reason is that a sensor is starting to fail or there is a temporary breakdown in communication between the sensor and the main control board.