Manitowoc Ice SERVICE LIMIT 3

What does Manitowoc Ice SERVICE LIMIT 3 mean?

On the USE0050, Service Limit 3 is the water-loss/no-water fault, shown as 3 flashes of the service LED. If the high- and low-level float switch does not open within 4 minutes into prechill, the machine shuts down and the power LED turns off. It retries after a 30-minute delay, repeats the 30-minute shutdowns while the symptom persists, and goes off permanently on Service Limit 3 after 100 restart attempts.

Symptoms

• Machine cycling off with 30-minute pauses, then off entirely
• 3 flashes on the service LED
• Sump not filling during prechill

Common causes

• No water supplied to the machine
• Plugged water filter
• Failed water inlet valve

Diagnostic steps

1. 01

   Restore the water supply

   Confirm the shutoff is open and supply pressure is present at the machine.

2. 02

   Replace the water filter

   A plugged filter starves the fill; swap it and retest.

3. 03

   Test the inlet valve

   Verify the water inlet valve opens on command during prechill.

4. 04

   Watch a prechill

   Confirm the float switch opens within the 4-minute window and the code stays clear.

When to call a professional

Refrigeration-system diagnosis and electrical work on this machine belong with a qualified commercial ice-machine technician (EPA certification for refrigerant work). If the service limit returns after the checks here, stop resetting the machine and book service — repeated safety-limit trips indicate an unresolved underlying fault.