There is ice forming on the wall hood during winter – is this normal?

Yes, in some areas it is normal for ice to form on the wall hood during winter, especially when sub-zero temperatures are combined with high outdoor humidity. When this occurs, the ice must be removed. This is described in the user manual for the product. A more permanent solution is to install a heating cable on the combination box to prevent ice formation. Installation of a heating cable must be carried out by a certified electrician.