Chemical valve not open or clogged. Open chemical valve or clean. Strainer not submerged in solution. Submerge strainer and replenish chemical. Detergent hose cut or kinked Inspect hose, replace as necessary.
Water is emitted from the chemical pickup tube Check valve malfunctioning.
Repair or replace check valve. Downstream injector will not siphon chemical. Brass knob on injector is closed. Open by turning counter clockwise. Unit not in low pressure mode.