U-Line Class Series Wine Cooler E2 (Class Series): Thermistor 2 Open

E2 (Class Series) at a glance

Code

E2 (Class Series)

Appliance

U-Line wine refrigerator

Applies to

U-Line Class Series wine coolers (UHWC524, 2224DWR)

Type

Needs attention soon

Can you clear it yourself?

Sometimes, after the safe checks below

Most likely cause

Thermistor 2 has gone open

What you may notice with E2 (Class Series)

• E2 is entered in the error log of the cooler
• The cabinet temperature may stray from the setting
• The cooler may keep running as if nothing changed

How the wine refrigerator detects E2 (Class Series)

Class Series coolers rely on thermistors to learn the temperature inside, and Thermistor 2 is the second of them. The control sends a signal through its circuit and reads the response. Reading it correctly depends on the circuit being complete from end to end.

If the path is broken, the response never arrives, and the control writes E2 to its error log as an open Thermistor 2. The log table lists this next to the other sensor conditions. A break may sit in the sensor, in the wire along its route or in a connector. The code alone cannot separate those, which is why testing each piece matters. Until the circuit is repaired, the control works without a second temperature reading.

Likely causes of E2 (Class Series)

• Thermistor 2 has gone open
• The sensor wiring has a break in it
• A connector has corroded and lost contact

Can you keep using the wine refrigerator with E2 (Class Series)?

You can use it for a short while with attention. Without a reading from Thermistor 2, the control may not regulate its zone precisely. A separate thermometer inside is the best guide, and a quick glance several times a day is enough. If the number drifts upward, remove the wine to a cooler place and leave the cooler off until it has been tested.

What you can safely check

1. Turn off the power at the plug for a minute, then restore it.
2. Use a thermometer of your own to check the temperature inside the cabinet.
3. Keep the rear of the cooler dry and unobstructed.
4. Leave every cover on.
5. If E2 shows again, call us.

What our technician does for E2 (Class Series)

• Test Thermistor 2 to see whether its circuit is open
• Check the sensor wiring and the connector separately
• Replace the sensor or repair the connection, then confirm the log stays clear

How to keep E2 (Class Series) from coming back

• Keep the back of the cooler free of moisture and stored items.
• Avoid dragging the cooler across the floor, which can tug the sensor wiring.
• Let a technician handle any panel, since the sensor wiring sits behind it.

Technical reference

Code

E2 (Class Series)

Appliance

U-Line wine refrigerator

Control family

U-Line Class Series wine coolers (UHWC524, 2224DWR)

Maker documentation

U-Line owner manuals and support

Checked

November 2026

Code meanings come from the maker’s documentation and our own repair work; we do not reprint the maker’s document. Confirm the full model number before acting on a code. We are an independent repair company, not affiliated with U-Line Corporation.