Function selector guide
Most damages to function selectors are caused by back-flow of chemicals or water – this can be caused by:
1. Defect non-return valve(s) for chemical
Check non-return valve by dismounting the suction hose on the needle valve. If water appears the non-return valve is defect (water inlet to the unit must be open).
Change non-return valve.
2. Defect chemical valve(s)
To prevent failure of the chemical valve and non-return valve, make sure to flush the injector system with water after using chemicals.
Exchanging function selector
When exchanging the function selector, please note:
- Control the function of the non-return valve(s) and the chemical valve(s). Replace if necessary.
- Air hoses between function selector and chemical valve must be flushed with clean water or replaced by new.