Manitowoc Ice Machine Error Code E10: Dual-Circuit Flooding

What does Manitowoc error code E10 mean?

This Event Log entry applies to Manitowoc Indigo ice machines without the NXT display that have dual expansion valves and a dual circuit. Like E09, it fires when two compressor discharge line temperatures differ by less than 1.05 F, which the control board reads as liquid flooding the evaporator. On a dual circuit there are two paths for refrigerant, so a valve that opens too far on one of them can push liquid through while the other path looks normal. The sealed system is then out of balance. Ice output suffers, the machine may sound different, and slabs can come out soft. A second possibility is a discharge sensor that reads almost the same as its partner by mistake, which makes the board see flooding that is not there. The display text for the entry is E10. The log cannot tell the cases apart, so a technician uses gauges and a thermometer to decide whether the problem is a valve, a sensor or the amount of refrigerant.

Affected models and control systems

Manitowoc Indigo series cubers with the non-NXT control board (Service menu > Event Log > View ELog). E10 is for dual-circuit machines with dual expansion valves; single-circuit units log E09.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

• Change in compressor sound
• Lower or uneven ice output
• Soft slabs
• Suction lines unusually cold outside the cabinet

Possible causes

Listed in Manitowoc's documentation

• An expansion valve that floods one circuit of the dual evaporator
• Discharge temperature sensors that read nearly the same by mistake
• Too much liquid refrigerant reaching the compressor discharge side
• An evaporator sensor that gives the board a wrong reading

Other likely causes — what usually sits behind error code E10 on this control. A technician confirms which one it is before any part is replaced.

• One valve bulb that slipped on a suction line while the other stayed in place
• A discharge sensor wire pinched during an earlier service and reading the wrong spot
• A charge topped up beyond what a two-circuit evaporator can handle

Safe checks before calling for service

How a technician diagnoses error code E10

1. Read the Event Log for E10 and any other flooding or valve entries.
2. Check both discharge sensors against a reference thermometer.
3. Measure superheat on each circuit with gauges.
4. Inspect both valve bulbs for position and insulation.
5. Correct the valve, sensor or charge that the readings identify.

How error code E10 differs from similar codes

E10 repeats the E09 temperature test, but on machines with two expansion valves.

Technical reference

Document

Indigo Series Technician's Handbook 000014794 5/17, "Event Log" p.87-91

Maker documentation

Manitowoc owner support

Edition

Part Number 000014794 5/17

Models / control

Indigo series (non-NXT) control board, Event Log (Service menu > Event Log > View ELog)

Section

Event Log: code list p. 87, Event Log Detail table pp. 88-91 (Service menu > Event Log)

Checked

October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.