Wine cooler displays E2 and temperature reading is erratic or does not change even when the unit is cooling.

Safety warning: Always disconnect power before removing interior panels or touching wiring. Sharp metal edges around the evaporator can cause injury; wear cut-resistant gloves.

Steps to address E2:

• 1. Power cycle: Unplug the cooler for 5–10 minutes and plug it back in. If E2 reappears, proceed with inspection.
• 2. Access the evaporator area: Remove the interior rear panel inside the wine compartment (usually held by a few screws). Behind it you will see the evaporator coil and fan assembly.
• 3. Locate the evaporator thermistor: Look for a small probe clipped or taped to the evaporator tubing, typically near the middle or top of the coil. Ensure it is firmly attached and not hanging loose.
• 4. Inspect wiring: Follow the thermistor wires from the coil area to where they exit the liner and go toward the control board. Check for chafed insulation, broken conductors, or loose connectors.
• 5. Test the sensor (advanced): With the unit unplugged, disconnect the evaporator thermistor at the control board and measure resistance with a multimeter. Compare to the cabinet sensor reading at the same temperature. A reading of 0 ohms or infinite resistance indicates a failed sensor.
• 6. Replace the evaporator thermistor: If defective or physically damaged, install a new Insignia evaporator temperature sensor. Clip or tape it securely back onto the evaporator coil in the same location to ensure accurate defrost and temperature control.
• 7. Evaluate the control board: If the sensor and wiring are good but E2 persists, the main control board may not be reading the sensor correctly and will likely need replacement.

Note: Do not bend or puncture the evaporator tubing; this can release refrigerant and permanently damage the cooler.