Compupool water fault

Hi, I am from Czech republic and I bought Compupool CPSC 16 in 2014. At end of last season I had two errors on LCD screen. no water and add salt.
The cell looks good, no damage, connectors are without corrosion and tightly connected on pins.

After start verification process (58seconds) unit continue process of testing (1:48seconds). Always I see in the cell gas... Then I get the error no water or add salt. My concentration of salt is about 5000ppm.
This process is in infinity loop.
 
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