How to Fix / Troubleshooting

Safety first: Turn off power and close the water supply valve. Relieve water pressure before disconnecting lines.

Steps:

Check water filter and supply: Replace the water filter cartridge and verify the supply valve is fully open. Ensure there are no kinks in the line.
Locate flow switch/sensor: On some Manitowoc models, a flow switch is installed in the inlet line or sump area. Remove and inspect for scale or debris.
Clean or free the switch: Use ice machine cleaner to remove mineral buildup. Ensure the paddle or internal mechanism moves freely.
Test operation: After reassembly, restore power and water, then run a cycle. If E19 persists, replace the water flow switch / sensor.

Tip: Maintaining proper filtration and regular descaling greatly reduces flow‑related faults.

E19 displayed, unit may not detect water flow correctly, causing fill or freeze issues.

Possible Causes