E3 error, and the compressor runs continuously or not at all, leading to unstable temperature.

Safety first: Disconnect power before removing any covers.

Steps:

• Locate the ambient temperature sensor. On many Ocean freezers, it is near the front grille or control panel, sensing room temperature.
• Remove the kick plate or control panel trim to access the sensor.
• Ensure the sensor is not touching hot components (like the compressor discharge line) and is positioned in free air.
• Inspect the wiring harness for damage or loose connectors at the control board.
• Test the sensor with a multimeter for proper resistance at room temperature; replace it if open, shorted, or out of specification.
• Reassemble, restore power, and verify if the E3 code disappears.