I followed the maintenance instructions, changed the pre-filters once, cleaned the drainage. In my house, the pressure is only 2 atmospheres (I measured it with an ordinary pressure gauge), the documentation says that at least 3.5 is needed, because of this, I had a lot of water going into the drainage, and the tank was filled up to a maximum of 40%. I recently installed a pump and two sensors to increase water pressure. Now everything is working fine.
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