Display shows E0 and the wine cooler does not cool properly or at all.

Safety first: Unplug the Haier wine cooler from the wall outlet before removing any panels. Do not work on the unit while it is energized.

Steps to check and address E0:

• Power reset: Unplug the cooler for 5 minutes, then plug it back in to see if the code clears. If E0 returns, continue.
• Locate the cabinet sensor: Inside the wine compartment, look for a small plastic probe or sensor cover on the rear or side wall. On many Haier models, the cabinet NTC is clipped behind a small plastic grille.
• Inspect the sensor and wiring: Remove the interior shelf near the sensor. Gently pull the sensor cover (if present) and visually inspect the sensor lead for cuts, pinches, or corrosion where it passes through the liner.
• Check connections at the control board: Remove the rear metal service panel. Locate the main control PCB (usually near the compressor). Find the connector labeled for the cabinet sensor (often marked "RT" or "NTC"). Ensure the plug is fully seated and not corroded or burnt.
• Test the sensor (if you have a multimeter): Disconnect the sensor from the board and measure resistance at room temperature. A typical Haier NTC will read between 5–20 kΩ at ~25°C. Infinite resistance indicates an open sensor; near 0 Ω indicates a shorted sensor.
• Replace if defective: If readings are out of range or the wiring is damaged, replace the cabinet temperature sensor with a Haier-compatible NTC probe. Route the new sensor along the original path and secure it away from moving parts and evaporator fins.
• Reassemble and test: Reinstall panels, plug the unit back in, and allow 10–15 minutes. Confirm that E0 is cleared and that the interior temperature begins to drop.

When to call a technician: If the sensor tests good but E0 persists, the main control PCB may have a failed sensor input and should be diagnosed or replaced by a qualified technician.