Check the installation before switching on. The ventilation channels must be clean and dry and moving parts must be able to move freely. Only operate the ventilation unit when it is fully assembled (external cover fitted, all control and accessory components connected).
Switch on the mains fuse. The unit switches on. The fault LED lights up briefly. The LEDs on the control then indicate the currently set operating mode and ventilation level.
Carry out a function test at the highest and lowest ventilation level.
Test the operating modes and the function of connected accessory components.