E1 error on display, wine cooler runs but temperature is inaccurate or fluctuates wildly

Safety warning: Disconnect power before accessing internal components. Sharp metal edges are present around the evaporator cover.

• Remove interior panel: Take out shelves and the rear inner panel to expose the evaporator coil. The evaporator sensor is usually clipped directly to the coil or mounted in a small plastic housing.
• Check sensor placement: Ensure the sensor is firmly clipped to the evaporator and not hanging loose. A loose sensor can cause E1 and erratic temperatures. Re-clip it securely if displaced.
• Inspect wiring: Follow the sensor wires back to the harness. Look for chafing, pinched insulation, or corrosion at the connector. Reseat the connector on the harness and on the main PCB if accessible.
• Test resistance: With the unit unplugged, disconnect the sensor and measure its resistance at room temperature. Compare to CELLA's NTC chart. Replace the CELLA evaporator NTC sensor if readings are out of range or intermittent when you gently flex the wires.
• Control board check: If a known-good sensor still triggers E1, the CELLA main control board sensor circuit may be defective and require replacement.