Numatic Delayed Solution Shut-Off

Solution continues to spray for several seconds after releasing the trigger.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Sticking solution valve in wand or handle, Residual pressure due to blocked return path, Swollen internal valve seals, Incorrect trigger cable adjustment (if mechanical)

How to Fix / Troubleshooting

Safety first: Unplug the machine and depressurise by spraying into a bucket until flow stops.

Inspect trigger mechanism: Open the handle and check that the trigger fully releases the valve or microswitch.
Clean valve: If the wand has a mechanical valve, disassemble it carefully and clean any debris or scale from the moving parts.
Check seals: Inspect O-rings and seals for swelling or distortion. Replace if they do not move smoothly.
Test operation: Reassemble and test with clean water. If the delay persists, replace the valve assembly.

Repair Difficulty

Medium 3/5

Required Part

Solution Control Valve (Wand/Handle)

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