Manitowoc NEO undercounter (U0140 to U0310)
Self-contained undercounter cubers with a touch pad Service (wrench) light and SL#1 / SL#2 lights on the control board. Three safety limits stop the machine after repeated long cycles or water loss.
What it is: Undercounter cube ice machine. U0140/UF0140 through U0310/UF0310.
Key combo: Read the SL#1 / SL#2 lights on the control board. Press On/Off to reset and start a new cycle.
Manitowoc NEO undercounter (U0140 to U0310) error codes
| Limit | Meaning | How it shows | How to reset |
|---|---|---|---|
| Safety Limit 1 | Long freeze | After 3 long freezes in a row, SL#1 and the wrench light flash once a second. After 6 in a row the machine stops with both lights on steady. | Press On/Off to start a new cycle. |
| Safety Limit 2 | Long harvest | Harvest is extended to 7 minutes with the water pump on, then up to two 170-second thaw cycles. After 3 failed harvest/thaw cycles in a row the machine stops. | Press On/Off to start a new cycle. |
| Safety Limit 3 | No water sensed | At 4 minutes into freeze with the float still down for 10 s, the machine stops for 30 minutes (SL#1, SL#2 and wrench light flash) then restarts. After 100 failures in a row it stays off with the wrench light on. | Press On/Off. Not checked on the first cycle after a manual start, full bin or safety limit. |
Other useful key presses
| Task | How |
|---|---|
| Long freeze time by firmware | V1.0–V2.53: 60 min. V2.54–V2.9: 45 min. V3.0 on: 30 min. Check the label on the control board. |
Notes
- The freeze time that counts as long depends on the firmware version, so check the board label before diagnosing a Safety Limit 1.
For licensed technicians only. This equipment can involve mains voltage, high-voltage microwave circuits, gas and refrigerant. Isolate power (and gas) before opening panels, follow the manufacturer's manual and your local licensing rules (for example ARC refrigerant handling and electrical or gas licences). Wrong settings can spoil food or damage equipment. Check every value on the unit in front of you before changing it.
Based on: Manitowoc NEO undercounter service manual (000014797 rev 06). Always check the manual for your exact model and software version.
ServiceModes is not affiliated with Manitowoc or any other manufacturer. Written in our own words from the manufacturer's documentation.