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Error Code

U-Line Ice Maker Zone T and Amb Thrm Error Codes

Request U-Line Service (310) 879-5776
Clara Bennett Written by Clara Bennett Appliance Care Editor Published September 3, 2026 Updated October 20, 2026

Content status: Verified

Error code Zone T / Amb Thrm
Appliance Ice Maker
Quick answer

Zone T Open, Zone T Short and Amb Thrm Open are thermistor circuit codes on the U-3018CLRS-40B clear ice machine.

Model compatibility: U-Line reuses codes across series and model years, so Zone T / Amb Thrm may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.

Plain language

What this code means

Zone T Open, Zone T Short and Amb Thrm Open: left or right zone thermistor, or ambient thermistor, circuit open or shorted; contact Customer Care.

The troubleshooting table for the U-3018CLRS-40B, a current 3000-series clear ice machine, lists three thermistor circuit messages. Each has the same answer: contact Customer Care.

Message Meaning
Zone T Open Left or right zone thermistor circuit open
Zone T Short Left or right zone thermistor circuit shorted
Amb Thrm Open Ambient thermistor circuit open

No owner steps

The manual offers no checks for owners here. The service menu’s All Errors screen counts how many times each message has occurred.

Related messages

  • No Comm: lost display communication.
  • Slow flash: a thermistor sensor LED signal on older clear ice makers.
  • WTD Reset: a software restart that needs no action.

Clear ice maker service in Los Angeles

Call (310) 879-5776 to arrange ice maker repair in Los Angeles. Say which of the three messages appears and give the model number.

Source: U-Line U-3018CLRS-40B Clear Ice Machine User Guide & Service Manual (Troubleshooting, All Errors log)

Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.

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