The heat pump system can be equipped with a room temperature sensor  as an option. In normal operation, the set room temperature (for example 20.0 C). A button shows the set value with flashing numerals and then change can be made with the + or – buttons.

The outdoor temperature is displayed for 10 seconds on both keys being pressed at the same time. If an alarm has been triggered, an A shows  in the display.

The sensor is wall-mounted. It should be installed by a qualified electrician.