Defect: Scooba 450 does not suck up water

Scooba 450 leaves a lot of water on the floor and does not suck it up.

In the tank, the dirty water compartment (grey cap) is empty or contains very little water.
Solution.

Unfortunately, this is the worst defect because it is not the pump (which is replaceable), but the suction system, which consists of a fan controlled by an electronic circuit. It is quite accessible, but the repair is not as affordable as replacing the pump.

The fan is on the opposite side of the pump and is connected to the electrical circuit that controls it with wires.

One can try to change the fan, but it is necessary to cut the wires, replace the fan and solder the wires back together. This is an attempt.

If it still does not act with this replacement, it is a fault in the electronic circuit that is embedded in black resin, so it is virtually impossible to repair.

Anyway, this is the procedure (as a hobbyist):

Remove the brush and, under the brush the plastic guard.

2 screws to unscrew (those are not lost because they are attached to the plastic)

This is the fan connected with several wires to the electronic circuit.

Now, to pull it out, you have to lift the black plastic bottom, unscrewing 12 screws (trying not to lose them because they do not stick to the plastic). You have to exert a good deal of force, after unscrewing all the screws, to extract the bottom, and the screws will splash all over the room (equip yourself with a good magnet to go looking for them).

With that done, here is the fan to be replaced :
 

And here are the connecting wires, which, fortunately, are quite long.

What can I say?  Good luck :))

P.S. Important. In any case, the Scooba 450 must act at least once a week in order to prevent the little tube that leads the water to the pump (3 mm diameter) from drying out.