Your boiler has lost its digital connection with your Alpha remote control or thermostat, meaning they can no longer talk to each other to manage your heating.

DIY fix possible

Check if the batteries in your Alpha Climatic control unit need replacingEnsure the control unit is within range and hasn't been moved behind a large metal object or thick wallTurn off the power to the boiler at the fused spur, wait 30 seconds, and turn it back on to reset the connection