LEDs on the on-board monitor control panel (BMBT)

LEDs can have a steady light or flash.

The LEDs are switched on by I-bus data telegrams from the control units instrument cluster electronics (IKE), telephone and radio. After being switched on, the corresponding LED remains on until the on-board monitor control panel receives a corresponding I-bus data telegram to switch off the LED.

Telephone LED:

• Yellow: Telephone ON
  
• Red: Telephone operation not possible. If the LED lights, the telephone is outside the supply range. If the LED flashes, the telephone is within the network range but not registered.
  
• Green: Telephone in operation. Lights when telephone is in call status: After picking up the receiver up to replacing the receiver.
  

Radio LED:

The radio is switched on and off by pressing the rotary knob for volume control. The radio LED lights orange when the radio is switched on.

LED for independent heating/ventilation:

The fan symbol above the button lights red when independent heating/ventilation is programmed. The symbol flashes when independent heating or ventilation is currently active.