New ventilation system distributes dust everywhere

We started up the new heating system in the new timber-frame house six months ago. For the past month, we have increasingly noticed that white dust accumulates on the TV, the microwave, and everywhere there are smooth surfaces. Wiped away in the morning, back again in the evening (see photos).

The heating system is a Tecalor 303 SOL, without moisture recovery or similar.

What could this be?

Even the laptop in the drawer is full of it.

Have you ever changed the filters?

We put the new heating system into operation in the new timber frame house six months ago.

IMHO not yet a reason to change the filter. Was the system closed during the construction phase? But you had no problems for five months ... Hmm, well, as an outsider, I can't interpret your photos. Is it possible to place a receiving filter specifically in front of an air outlet (stretch a pillowcase 30 cm in front of the outlet) to find out if the dust is coming from the system?

Is the dust flammable? (How else can one figure out what kind of dust it is, using household methods? Caution, dust explosion hazard, so think carefully before playing with fire...).

There are companies that clean ventilation systems. Just invite one over to take a look at the storage.

Before I ask any company, I talk to the one who installed [das].