First, narrow it down
Watch the button and nozzle as you let go. Does the plastic button rise normally, or stay depressed?
What you're seeing
| Symptom | Possible cause | What to do next |
|---|---|---|
| Button physically sticks down | Button plate or butterfly retainer | Exterior clean, then gun service. |
| Button returns; nozzle flows | Valve seal/debris | Isolate and have valve inspected. |
| Several buttons stick | Shared mechanical/assembly issue | Remove affected gun from service. |
What to check
Stop using the affected gun
Set the gun securely in its holder and prevent a spill. Follow the approved gun shutoff or isolation procedure if the liquid will not stop.
Check for sticky syrup on the outside
Sticky drink residue around a button plate can interfere with movement. Clean accessible exterior surfaces using the manufacturer’s procedure. Do not pry the button or introduce a sharp object.
If the button stays physically down
The butterfly plate or retainer can bind, and Wunder-Bar’s Mark 4 manual specifically lists overly tightened butterfly retainers as a possible cause. Adjustment requires the appropriate model procedure and trained service.
If the button returns but liquid still runs
Debris can prevent a cork O-ring or molded valve from seating. A worn seal is another possibility. Older documentation describes a controlled backflush method, but untrained staff should not block the nozzle or press all buttons at once.
Check whether one or several buttons are involved
One button suggests a local button or valve problem. Multiple buttons may point to a broader gun assembly issue.
Arrange the model-specific repair
Make a note of the gun version and affected product. Internal retainers, valve stems, and seals are different service procedures.
Why it happens
A sticky button and a leaking valve can look alike from the bar. Watching whether the button returns normally helps separate the two.
Need service?
Do not return a free-pouring gun to service until it has been repaired and tested.
Contact us (215) 726-8000