Manitowoc Ice SERVICE LIMIT 4

What does Manitowoc Ice SERVICE LIMIT 4 mean?

On the USE0050, Service Limit 4 is the condensate-pump fault, shown as 4 flashes of the service LED. The machine shuts down if the float switch in the condensate pump is open, or if the jumper in the ice machine's wire harness is not in place.

Symptoms

• Machine off with 4 flashes on the service LED
• Condensate pump reservoir full or overflowing
• Fault immediately after installation or service (jumper missing)

Common causes

• Failed condensate pump
• Restricted drain line from the condensate pump
• Harness jumper not in place

Diagnostic steps

1. 01

   Check the pump

   Verify the condensate pump runs and empties its reservoir; a full reservoir opens the safety float.

2. 02

   Clear the drain

   Check the drain line from the pump for restriction and clear it.

3. 03

   Verify the jumper

   On installs without a condensate pump, confirm the harness jumper is in place.

4. 04

   Retest

   Clear the fault and confirm the machine completes cycles without the 4-flash code.

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.