U-Line Ice Maker Error Code Amb Thrm Short

Amb Thrm Short means the ambient thermistor circuit has been detected as shorted by the control board. The ambient thermistor monitors surrounding air temperature and feeds that data to the control system. A shorted circuit produces an abnormally low resistance reading that the board cannot use for accurate temperature control. The fault can be caused by damaged wiring, a failed thermistor, or moisture at the connector.

It is generally not advisable to continue relying on the ice maker while this error is active. Without accurate ambient temperature data, the control system may not operate efficiently or may make incorrect decisions about the cooling and ice-making cycle. Continuing to run the unit in this state could lead to poor ice production or additional component stress.

A reset may temporarily clear the error code from the display, but if the underlying short condition still exists in the thermistor circuit, the fault will return once the unit runs through its diagnostic cycle again. Clearing the code without addressing the root cause does not fix the problem. The thermistor, cable, and connectors must be inspected and tested to achieve a lasting repair.

A knowledgeable DIYer can begin by inspecting the thermistor cable for visible damage, pinch points, or moisture at the connector, which are the most common causes. If the cable looks intact, using a multimeter to test thermistor resistance can confirm whether the component itself has failed. Replacing the thermistor or its cable is a straightforward repair if you are comfortable working with appliance wiring, but if the control board is suspect, professional service is recommended.

If only the thermistor or its cable requires replacement, repair costs are typically in the range of $50 to $150 for parts and labor, depending on your location and service provider. If the control board is found to be the root cause, costs can rise significantly, often falling in the $200 to $400 range or higher. Getting a diagnostic visit from a qualified technician will give you a firm estimate before committing to the repair.