Your boiler’s internal computer and main controls have lost their connection, preventing the system from starting up.

Break in communication to the TR2 room thermostat

What causes this fault?

This fault occurs when the 'brain' of your boiler can no longer talk to the control panel or the internal sensors. It is usually caused by moisture affecting the electrical circuits, a loose connection in the internal wiring, or a critical failure of the main printed circuit board itself.