Sub-Zero Designer Wine (IW) Code 10-3-10: zone 3 coil sensor open

What 10-3-10 means

The zone 3 evaporator thermistor on a Designer Wine (IW) unit like the IW-30CI or IW-30 is reported open when 10 3 10 appears. The sensor on the zone 3 cooling coil shows no circuit, so the control cannot read coil temperature or time defrost for zone 3. This is a coil sensor, not a condenser sensor. Frost often builds on the zone 3 coil, airflow weakens, and zone 3 slowly warms.

Common causes of 10-3-10

A zone 3 coil sensor plug that has come apart
A wire broken near the coil, sometimes by ice
An open zone 3 evaporator thermistor
A control that cannot read the circuit

✓ One safe check you can try

1. Look for frost through the zone 3 air vents. 2. Never chip ice off the coil. 3. Keep the zone 3 door closed and sealed. 4. Reset the breaker once. 5. Schedule service if frost builds or 10 3 10 returns.

! Why to stop there

The coil sensor sits next to refrigerant tubing
Melting ice safely takes time and panel removal
Tracing an open circuit needs 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.

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Other Wine Storage codes

10-3-1010-3-10 questions

Is 10-3-10 a condenser problem?

No. It names the zone 3 evaporator thermistor on the cooling coil inside the cabinet. The condenser sensor uses the 10 C codes. Do not mix them up.

Why does zone 3 get warmer slowly?

Without a coil reading, defrost may not run when needed. Frost builds on the coil and blocks airflow, so the zone warms over days. A thermometer shows the trend.

What will you do on the visit?

Melt any ice, test the sensor circuit and replace what failed, after you approve a written price. Work is covered for 30 days. Expect most of a morning.