Incorrect chemical concentration
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Suction filter at the end of the suction hose is blocked
Dosing valve/chemical restrictor, non-return valve, or filter at the chemical inlet is blocked
Chemical can empty
Viscosity of chemical product too high
Suction filter at the end of the suction hose is above fluid level in the chemical can
Wrong setting of the dosing valve
Pump station not started
Incorrect adjustment of dosing valve or wrong chemical limiter mounted