i have five different Aermec units with gr3 display. The units are made between 2007 and 2013.
the issue is that all of the displays locks/freezes from time to time. So its not possible to use any buttons on the controller.
when this occurs the modbus card crashes as well, cant read or write anything.

ive found a temporary solution.
Turn power off, wait a few minutes and turn power on.

does anyone have a better solution to the problem that last longer than a few weeks?