Sub-Zero Designer Wine (IW) Code 10-2-10: zone 2 evaporator sensor open

What 10-2-10 means

On IW-24, IW-30 and similar Designer Wine (IW) units, 10 2 10 reports that the zone 2 evaporator thermistor is open. This sensor is clipped to the zone 2 cooling coil, and open means the control sees no circuit at all. Without it, the control cannot judge coil temperature or time defrost for zone 2. Frost may build on the zone 2 coil, airflow may weaken, and zone 2 may slowly warm.

Common causes of 10-2-10

A disconnected zone 2 evaporator sensor plug
A wire broken near the coil, sometimes by ice
A zone 2 evaporator thermistor with an open circuit
A control input that cannot read the sensor

✓ One safe check you can try

1. Look for frost behind the zone 2 rear panel vents. 2. Do not scrape or chip at ice. 3. Make sure the door seals so moist air stays out. 4. Restart power at the breaker after a minute. 5. If frost grows or 10 2 10 returns, schedule service.

! Why to stop there

The coil sensor sits next to refrigerant tubing
Ice around the coil must be melted, not chipped
An open circuit has to be traced with a meter

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

10-2-1010-2-10 questions

Why does an open coil sensor cause frost?

The control uses the coil reading to decide when to defrost. With the sensor open, it cannot tell when the coil has iced, so frost builds until airflow drops.

Is 10 2 10 the same as 10 2 00?

No. 10 2 00 is the zone 2 cabinet air sensor. 10 2 10 is the zone 2 evaporator sensor on the coil. They are different sensors in different places.

Can you fix it in one visit?

Usually, once any ice is melted. We trace the circuit, replace what failed and quote in writing first, with a 30-day workmanship warranty. Expect a few hours on site.