Digital display shows E1 and cabinet temperature is much warmer than the set temperature

Safety first: Unplug the Transtherm wine cabinet from the mains before removing any panels. Do not work on live circuits.

Steps to check and correct:

• Power reset: Disconnect power for 5 minutes, then reconnect. If E1 returns after a few minutes of operation, continue with diagnosis.
• Locate the upper NTC sensor: Inside the cabinet, find the small plastic sensor cover on the rear wall of the upper zone (or single zone, near mid-height). Remove any shelves blocking access.
• Inspect the probe and wiring: Gently pull the sensor cover and probe out. Check for cuts, pinched cable, or signs of moisture ingress at the probe tip. Dry any condensation and reseat the probe firmly.
• Check connections at the control board: Remove the top or rear service panel (depending on model) to access the main control board. Trace the upper sensor harness to the board and ensure the plug is fully seated and not corroded.
• Test the sensor (if you have a multimeter): With the cabinet unplugged, disconnect the sensor from the board and measure resistance across the two sensor leads. A typical NTC will read between 5–20 kΩ at room temperature. An open circuit (infinite) or near 0 Ω indicates a failed sensor.
• Replace if faulty: If the sensor is open/shorted or visibly damaged, replace it with a compatible Transtherm upper cabinet NTC temperature probe. Route the new probe along the original path, avoiding sharp bends, and reconnect to the control board.
• Reassemble and test: Refit panels and shelves, restore power, and monitor the display. The E1 code should clear automatically after a short period if the fault is resolved.

When to call a technician: If the sensor tests good but E1 persists, the main control board may be misreading the probe and should be checked or replaced by a qualified technician.