Your wall-mounted remote control unit is not communicating correctly with the boiler because of a settings error.

Control mode - Vitotrol remote control incorrectly encoded

What causes this fault?

This fault occurs when the boiler’s software settings do not match the physical remote control or thermostat connected to it. It often happens after a power cut or a replacement part has been installed, causing the boiler to lose track of how it should be communicating with your wall controller. Essentially, the boiler is reaching out to a device it can no longer 'recognise' properly.