U-Line Refrigerator Error Code Amb Thrm Open

Amb Thrm Open means the ambient thermistor circuit is open, which indicates the control board is not receiving a signal from the sensor that monitors the air temperature around the unit. The open circuit can result from a corroded connector, a loose harness connection at the main board, or a failed thermistor. Diagnosis should start with inspecting both connection points before replacing any parts.

A reset may temporarily clear the error code from the display, but it will return if the underlying open circuit condition has not been resolved. The fault code is triggered by a real electrical condition, so clearing it without fixing the connection or replacing the thermistor will not solve the problem.

If the issue is simply a corroded or loose connector that can be cleaned and reseated, the repair may cost little to nothing beyond a service call fee. If the ambient thermistor needs replacement, parts and labor costs typically range from around $75 to $200 or more depending on your location and service provider. If the main control board is involved, costs can be significantly higher.

Start by checking the connector between the ambient thermistor and its harness for any signs of moisture or corrosion, then check the connection point where that harness attaches to the main control board. Clean or reseat any suspect connectors. If both connections are in good condition and the error remains, the ambient thermistor itself should be replaced.

The refrigerator cannot accurately read the ambient temperature around the unit while this fault is active, which may affect how efficiently it manages its cooling cycles. It is advisable to resolve the error promptly to ensure the unit is operating correctly and protecting stored food or beverages.