Air speed shows 0 Pa W1

1.- Make sure that the motor and fan spin well and to the right direction.

If the fan does not spin, it could be dirty. Clean the motor fan.

2.- Disconnect the chimney from the Roaster, turn on the burner and press F4.

If the Pa is going high that meant that the issue is not on the roaster but in the chimney, check that it is not dirty or clogged. If the chimney is dirty you need to clean perfectly.

After this you can connect again the chimney.

3.- Check in the back of the machine if the transparent tube at the siemens device has been connected. 

If the transparent tubing is loose you need to connected.

NOTE:

Each machine needs to have own chimney. Never share chimney, other way the alarms can appear.

How many bends has the pipe and how long is?