Written by
Clara Bennett Appliance Care EditorPublished September 3, 2026Updated October 20, 2026
Content status:
Verified
Error codeAmb Thrm Open
ApplianceWine Storage
Quick answer
Amb Thrm Open means the ambient thermistor circuit is open on the U-Line 3036 dual-zone cabinet.
Model compatibility: U-Line reuses codes across series and model years, so Amb Thrm Open 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
Amb Thrm Open means the ambient thermistor circuit is open; the manual says to contact Customer Care.
“Amb Thrm Open” is a message from the 3000 series control, which monitors its inputs and shows an error notification on the user interface if it detects a fault.
What it covers
The message applies to the U-Line U-3036BVWCS-00B, the 3036 dual-zone model, and to DWR and ZWC units where L is the top zone or drawer and R the bottom one. Ambient thermistor circuit open is the meaning given in the manual’s error table. Single zone models do not use the left and right indicators, and this particular message has none anyway.
What the manual says to do
The solution column reads simply to contact U-Line Customer Care. There is no owner adjustment for this message.
What a technician looks at
The extended troubleshooting section describes inspecting the ambient thermistor connection, replacing it if necessary, and checking the main control wire harness for splits or breaks.
Zone T Open, the left or right zone thermistor circuit open.
Evap T Open, the evaporator thermistor circuit open.
U-Line wine cabinet service in Los Angeles
For a U-Line wine cabinet or dual-zone refrigerator in Los Angeles, call (310) 879-5776 or see beverage center repair. Bring the message text, the model number and what you tried to the call.
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.
Seeing this code on your U-Line appliance?
Book a specialist visit for a clear estimate and approval before any repair.
U-Line products are compact, built-in, and often visually similar across generations. Effective repair starts with the exact model, the symptom you can…
