- Control lever is not in position” foaming/disinfecting”.
- Set to position “foaming / disinfecting”.
- Dosing or non-return valve blocked by chemical residue.
- Clean dosing or non-return valve.
- Is the right lance being used?
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With lance for foaming, red lance for disinfecting.
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Strainer in suction hose blocked.
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Clean strainer.
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(Chemical) detergent-reservoir empty or strainer above level liquid.
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Change to a new (full) detergent reservoir or place the strainer in the liquid.