What to do if water will not shut off completely on my Zline Apollo FSNZ?
- KKyle SimmonsJul 28, 2025
If water won't shut off completely in your Zline Plumbing Product, the cartridge may be defective. To resolve this, unscrew the lever on the handle by hand. Loosen the set screw with a hex wrench, then remove the handle and unscrew the trim cap by hand. Next, unscrew the locking nut with an adjustable wrench and remove the ceramic disc cartridge to check for any cracks.