U-Line Refrigerator Error Code Amb Thrm Short

Amb Thrm Short means the ambient thermistor circuit has shorted, sending an invalid signal to the main control board. The ambient thermistor monitors the air temperature around the unit and helps regulate cooling. This code typically points to moisture or corrosion at a wiring connection, or to a failed thermistor that needs replacement.

Operating the unit with an active ambient thermistor fault is not recommended for extended periods. Without accurate ambient temperature data, the control board cannot properly manage the cooling cycle, which can lead to inconsistent temperatures and potential food safety concerns. Address the fault as soon as reasonably possible.

A reset may temporarily clear the code from the display, but the error will return if the underlying fault has not been corrected. Because this code indicates an actual short in the thermistor circuit, the physical cause such as a corroded connection or failed sensor must be diagnosed and resolved before the code will stay cleared.

In many cases, yes. Start by inspecting the thermistor connector at the harness and the point where the harness connects to the main board, looking for moisture, corrosion, or loose pins. Cleaning and reseating those connections resolves the fault in some cases. If the connections are clean and secure, the thermistor itself will need to be replaced, which is a straightforward part swap for someone comfortable working with appliance wiring.

If only cleaning or reseating a corroded connector is needed, there may be no parts cost at all, though a service call can run between $75 and $150. If the thermistor itself needs replacement, expect parts costs in the range of $20 to $60 depending on the specific model, plus any labor charges if a technician is performing the repair.