U-Line UHWC524 E1 (Class Series): Thermistor 1 Open in Log
On the UHWC524 (5 Class), E1 appears in the error log when Thermistor 1, the first temperature sensor, has an open circuit. The control cannot take a temperature from that sensor.
What does U-Line wine refrigerator code E1 (Class Series) mean?
E1 is how the error log of the UHWC524 (5 Class) wine cooler from U-Line reports an open Thermistor 1. Thermistor 1 is the first temperature sensor. An open reading means its circuit is not complete, so the control cannot take a temperature from it. On this model the log is where the code is recorded, next to the other sensor entries, while door conditions are what you notice directly at the cabinet.
E1 (Class Series) at a glance
- Code
- E1 (Class Series)
- Appliance
- U-Line wine refrigerator
- Applies to
- U-Line 5 Class wine cooler UHWC524 (error log)
- Type
- Needs attention soon
- Can you clear it yourself?
- Sometimes, after the safe checks below
- Most likely cause
- Thermistor 1 has an open circuit inside the sensor
What you may notice with E1 (Class Series)
- E1 is listed in the error log of the cooler
- The cabinet may not hold the temperature you set
- The cooler seems to run, yet readings look unreliable
How the wine refrigerator detects E1 (Class Series)
The UHWC524 reads its first temperature sensor, Thermistor 1, through a circuit that has to be complete for the reading to mean anything. The control sends a small signal through that circuit and interprets what comes back as a cabinet temperature.
If nothing comes back because the circuit is open, the control cannot know the temperature in that zone. It records E1 in the error log so the problem is documented, and it does so alongside the other sensor entries for this platform. An open circuit can come from the sensor, from a break in its wiring or from a loose connector. Which of those it is cannot be read from the log; it takes testing at the cooler.
Likely causes of E1 (Class Series)
- Thermistor 1 has an open circuit inside the sensor
- A break somewhere in the sensor wiring
- A connector that has worked loose and is no longer seated
Can you keep using the wine refrigerator with E1 (Class Series)?
You can keep it running briefly, but keep a close eye on the cabinet. A cooler that cannot read Thermistor 1 may not regulate that zone well. Use a separate thermometer and check it several times a day. If the number stays steady, the wine is not at immediate risk. If it rises, move the bottles to a cooler place and stop relying on the unit.
What you can safely check
- Turn the cooler off at its plug and give it about a minute before powering it up again.
- Lay a separate thermometer inside and compare its number with what the cabinet feels like.
- Make sure the cooler is not pushed hard up to a wall.
- Leave the back panel of the cabinet closed.
- If E1 appears again in the log, call us.
What our technician does for E1 (Class Series)
- Test Thermistor 1 on its own for an open circuit
- Check the wiring and connector between the sensor and the control
- Replace whichever of the two fails, then confirm the log stays clear
How to keep E1 (Class Series) from coming back
- Keep the area behind the cooler dry and clear so wiring is not pulled or soaked.
- Leave a gap between the back of the cabinet and the wall.
- After a storm or power surge, glance at the display and log for new entries.
Technical reference
- Code
- E1 (Class Series)
- Appliance
- U-Line wine refrigerator
- Control family
- U-Line 5 Class wine cooler UHWC524 (error log)
- 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.
Related U-Line wine refrigerator error codes
E1 (Class Series) questions
Where would I see E1 on the UHWC524?
E1 is recorded in the cooler's error log as Thermistor 1 open. It sits among the sensor entries rather than flashing the way a door message does.
Is E5 a different sensor from E1?
No, both belong to Thermistor 1. An E1 entry says that sensor's circuit is open, while E5 says it is shorted, and the entry tells a technician what to test first.
How urgent is an E1 entry?
Check the cabinet temperature first. If bottles feel cool and steady, there is time to arrange a visit; if the temperature drifts upward, act sooner so the wine is not left warming.
Does E1 appear for the doors too?
No. Door conditions are reported separately and are easy to spot at the cooler. E1 in the log belongs to the first temperature sensor and says nothing about whether a door is open.
Will E1 leave the log when the sensor is fixed?
The entry records what the control saw. After the problem is corrected, the cooler should stop adding E1, and a technician can confirm that the sensor now reads normally.
Need help with E1 (Class Series)?
A technician finds the cause at your bar or lanai and puts the price in writing before any part comes out.