Sub-Zero BW-30/UW-24 Wine Code EC-05: upper cabinet sensor

What EC-05 means

Both the Classic BW-30 and the undercounter UW-24 and UW-24/S report EC-05, displayed as EC 05, when the upper cabinet thermistor reads open or shorted for 10 seconds or more, or keeps returning inconsistent temperatures. That sensor measures the air in the upper wine zone, so the control no longer knows how warm or cold that zone really is. The upper zone may drift, the display can show odd readings, and cooling cycles may become irregular.

Common causes of EC-05

An upper cabinet sensor connector that is loose
A pinched sensor wire near the door or liner
An upper cabinet thermistor that has failed
A control input that misreads the sensor

✓ One safe check you can try

1. Place a thermometer in the upper zone for an hour. 2. Compare it with the display reading. 3. Make sure the upper door closes and seals. 4. Reset the unit at the breaker after one minute off. 5. If EC 05 returns, call us.

! Why to stop there

The sensor and its wire run behind the liner
Testing needs a meter and a temperature reference
Replacing parts blindly can miss a wiring break

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 Storage codes

95-1-00Sub-Zero Designer Wine (IW) Code 95-1-00: zone 1 door open too long EC 11Sub-Zero 400 Series Wine Code EC 11: upper cabinet too cold EC 13Sub-Zero 400 Series Wine Code EC 13: lower cabinet cold alarm EC 15Sub-Zero 400 Series Wine Code EC 15: unit not cooling Service flashingSub-Zero 400 Series Wine "Service" Flashing: compressor ran too long 45-2-00Sub-Zero Designer Wine (IW) Code 45-2-00: zone 2 lights not drawing power 45-2-01Sub-Zero Designer Wine (IW) Code 45-2-01: zone 2 light short circuit 90-5-80Sub-Zero Designer Wine (IW) Code 90-5-80: keypad module not talking to the control

EC-05EC-05 questions

Why does the display show a strange temperature with EC-05?

The upper cabinet thermistor feeds the display. When it reads open or shorted, the number shown can jump or freeze, which is often the first clue.

Is the upper cabinet sensor the same as the upper coil sensor?

No. EC 05 is the air sensor in the upper cabinet. EC 06 is the sensor on the upper evaporator coil. They are tested separately.

How soon should I book?

Within a few days. The unit keeps running, but without a good reading the upper zone may drift. Repairs are priced in writing first. Keep a thermometer in the upper zone meanwhile.