Display shows E3 and lower zone does not maintain set temperature (dual-zone models).

Unplug the cooler before servicing.

• Identify model type: Confirm your hOmeLabs unit is a dual-zone wine cooler; E3 typically refers to the lower zone sensor.
• Access lower zone interior: Remove all lower-zone shelves and the rear interior panel (usually a plastic or metal cover over the evaporator).
• Locate the sensor: Find the small probe or plastic sensor housing clipped to the evaporator fins or mounted on the rear wall with two wires leading downwards.
• Visual inspection: Look for ice buildup around the sensor, broken clips, or damaged insulation. Defrost any ice with a hair dryer on low, keeping it away from plastic surfaces.
• Check wiring path: Follow the sensor wires to where they exit the cabinet and connect to the main control board. Ensure the grommet is intact and the harness is not pinched.
• Test resistance: Disconnect the sensor at the board and measure resistance at room temperature. If the reading is open, shorted, or far outside the expected NTC range, the sensor is bad.
• Replace sensor: Install a new hOmeLabs lower zone temperature sensor. Clip it securely to the evaporator or wall in the same position to ensure accurate readings.
• Reassemble and test: Refit the interior panel, restore power, and verify that E3 clears and the lower zone cools properly.

Tip: If E3 appears intermittently, check for moisture in the connector and dry it thoroughly before reassembly.