An unstable zone 2 evaporator thermistor is what 10 2 12 reports on Designer Wine (IW) units such as the IW-18 and IW-24. The sensor on the zone 2 coil is giving values that swing too…
An unstable zone 2 evaporator thermistor is what 10 2 12 reports on Designer Wine (IW) units such as the IW-18 and IW-24. The sensor on the zone 2 coil is giving values that swing too quickly to be real. The control flags it and treats coil readings with suspicion, which can upset defrost timing and cooling control in zone 2. Owners may see frost that builds and clears irregularly or a zone 2 temperature that will not hold steady.
1. Note how often 10 2 12 appears and at what time. 2. Check the door seal for gaps. 3. Look for frost that comes and goes. 4. Reset at the breaker once. 5. If the code keeps returning, arrange a visit.
An unstable reading is intermittent by nature. A connection that works most of the time but drops out briefly will set the code, then clear, then return.
Better not. Intermittent sensor problems often turn into open or shorted readings, and by then frost may have built up on the coil. Early repair is simpler.
Whatever the testing shows: plug, wire or thermistor. You approve a written price first, and the repair carries a 30-day workmanship warranty. Board replacement is rarely needed.
A technician diagnoses it on site and gives you the price in writing before any work starts.
