Boxster (981) Windscreen Fan Blower query

[330 CNM]

Have recently bought a 981 Boxster and wonder if you can help me with the following Windscreen fan/blower issue.
Every time I select/push the Windscreen button, the fan blower always blows at maximum speed and also at the High Temperature setting.
When I push/press the buttons to reduce the temperature and the blower speed, nothing happens and the fan remains at max and the temperature remains at high.
Grateful if you can help me with this.
Thanks.

[330 CNM]

Thanks very much for your replies... will give them a try later!