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The doser does not suck up

POSSIBLE CAUSES

D1 Suction valve missing/completely clogged
D2 Missing pump piston seal
D3 Suction filter completely clogged


POSSIBLE SOLUTIONS

D1.1 During operation check the suction valve by removing the suction hose and using one finger to check for suction by covering the valve 
D2.1 Turn off the doser and remove the pump casing, making sure the piston seal is present
D3.1 Check the health status of the filter immersed in the tank full of additives, making sure is not clogged with sediment inside the sump tank

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