Via a Test model mode In the control panel, you can run the components in the unit separately, which is particularly useful for troubleshooting.
To enter this mode, press 
Then on 
You will now be asked to enter a code. The code you should use is 123321 and then press the enter button.
You will now see a number of parameters that can be tested; for some, you can only see the value. All parameters where + or – lights up can have their value changed. For example, if you think there is something wrong with the supply air fan, press the down arrow to the parameter. 5711 fan speed supply air, where it says 0% as standard. You can now set the value between 0-100% using the plus sign and then press save, and the fan will start. You should now also be able to see a speed on the parameter below. 5712 depending on the unit. To run the parameter 5717 Output vvx Press the minus sign so that it reads -1%. The rotor will then run at a constant speed. This is the only parameter where you run -%.
Now you can test other parameters in exactly the same way.
To get to 100% faster, you can hold down the plus sign with your finger.
To finish the test, simply press the back button.