Sub-Zero BW-30 Wine Code EC 06: upper coil sensor reading

What EC 06 means

Classic Wine Storage, formerly called Built-In, includes the BW-30 and BW-30/S, and these units show EC 06 when the upper evaporator thermistor reads open or shorted for 10 seconds or more, or keeps reporting inconsistent temperatures. That sensor watches the upper cooling coil. Undercounter UW-24 models use the same meaning. With the reading lost, the upper zone can overcool, warm up, or gather frost on its coil because defrost timing is off.

Common causes of EC 06

A loose or corroded upper evaporator sensor plug
Wire damage near the coil
An upper evaporator thermistor that has failed
A control that misreads the sensor input

✓ One safe check you can try

1. Check the upper zone for frost on the rear panel. 2. Make sure the upper door seals all the way around. 3. Keep bottles clear of the back wall. 4. Restart the unit at the breaker after a minute. 5. If EC 06 comes back, call us.

! Why to stop there

The sensor is mounted near the coil behind a panel
A resistance test against temperature is the only reliable check
Ice near the coil should not be chipped with tools

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 06EC 06 questions

Does EC 06 mean the same on my UW-24?

Yes. On both the BW-30 and the UW-24 it points to the upper evaporator thermistor. We test it the same way on either model. Only the cabinet size differs.

Why is frost building in the upper zone?

The upper evaporator sensor guides defrost. When it reads open or shorted, defrost can be mistimed and frost builds on the coil. Melting that frost alone will not stop it from coming back.

Is this a quick repair?

Often, yes. A sensor or plug repair is usually done in one visit, priced in writing before work and covered by our 30-day workmanship warranty.