U-Line 1000/2000 Series Wine Cooler Code E4: Fourth Sensor Open

What E4 means

E4 appears on U-Line 1000 Series and 2000 Series wine coolers when Thermistor 4 is open. The fourth temperature sensor does not complete its circuit, so the control cannot read it. Older listings gave E4 a different meaning, but on these series it is a sensor reading. The 5 Class UHWC524 does not use E4.

Common causes of E4

Thermistor 4 is open
The sensor lead is broken
The connector is not making contact

✓ One safe check you can try

1. Take power off for one minute and restore it. 2. Find the real temperature with a thermometer. 3. Clear moisture from behind the cabinet. 4. Leave all panels alone. 5. Call us if E4 returns.

! Why to stop there

Sensor circuits need instruments to test
A wrong reading of an old chart leads to a wrong part
You get a written price first and a 30-day warranty

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Wine Refrigerator codes

E6U-Line 1000/2000 Series Wine Cooler Code E6: Sensor 2 Reading Shorted E6 (Class Series)U-Line Class Series Code E6 (UHWC524, 2224DWR): Thermistor 2 Short E7U-Line UHWC524 Code E7: Thermistor 3 Shorted Entry E9 (Class Series)U-Line 5 Class Wine Cooler Code E9: Door 2 (Lower) Open E5 (Class Series)U-Line Class Series Code E5 (UHWC524, 2224DWR): Thermistor 1 Short Door Alert SymbolU-Line Wine Cooler Door Alert Symbol: Door Left Open Over 5 Minutes drU-Line Wine Cooler Code dr: Door Open More Than 5 Minutes E0U-Line 5 Class Wine Cooler Code E0: Door 1 (Upper) Open

E4E4 questions

Which sensor does E4 refer to?

The fourth temperature sensor circuit is incomplete, so Thermistor 4 reads open.

Does the UHWC524 show E4?

No. The 5 Class UHWC524 does not use E4, so the code applies to the 1000 and 2000 Series coolers.

Does E4 have a shorted partner?

Yes. E8 is the shorted reading for the same sensor, and E4 is the open reading.