I don't know if this will help, but it's worth a try.
On page 46 of the Auaero5-6 Manual there is an Aquaero RESET procedure using jumpers on Temperature Sensor Inputs 5, 6, 7, and 8.
This will delete the Firmware in the Aquaero, which can then be reloaded through Aquasuite.
The Aquaero Manual can be downloaded here:
http://aquacomputer.de/handbuecher.html
RodeoGeorge