No suction of chemicals
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Suction filter at the end of the suction hose is blocked
Empty chemical can
Injector system is blocked by chemical residues
Leak on chemical inlet resulting in false air being sucked into the system
Dosing valve/chemical restictor or non return valve on the chemical inlet is blocked by chemical residues
Suction filter at the end of the suction hose is above fluid level in chemical can
Water pressure is too low
Solenoid valve is not opening
Non-return valve on suction hose/lance is not working