–

▶ Check the configuration (address setting). The selected setting requires a hard-wired room control.
▶ Check the EMS connection cable of the room control for damage. The BUS voltage on the room control must be between 12 and 15 V DC.
▶ Disconnect the EMS-BUS connection to the control unit and power the boiler off and back on again. Reconnect the EMS-BUS connection.
▶ If the problem persists the room control may be defective.